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Covalent organic frameworks (COFs) have been gaining substantial attention over the past decade due to their developing crystalline porous polymeric nature linked by strong covalent bonds and widespread applications in various fields. Currently, three-dimensional COFs (3D COFs) are engaging the spotlight due to their distinctive porous features, greater surface area, and exceptional performances in comparison with formerly published two-dimensional (2D) frameworks with the AA-stacking layered mode. In this paper, we present, for the first time, a nanoporous 3D-COF-based zinc(II) catalyst ([email protected]), which shows an efficient pathway for the chemical conversion of carbon dioxide to produce α-alkylidene cyclic carbonates and oxazolidinones from propargylic alcohols. The microporous material with a high surface area (312.61 m2/g) facilitates both types of catalytic reactions under atmospheric CO2 pressure. More importantly, easily recyclable and reusable catalysts produced moderate to high yields of desired carbonates as well as oxazolidinone products under solvent-free conditions. This study emphasizes the capability of nanoporous 3D-COF-based material in the catalysis field, more specifically in the field of CO2 capture and chemical fixation to fine chemicals. These results pave a spectacular pathway for the chemical fixation of CO2 into α-alkylidene cyclic carbonates and oxazolidinones from propargylic alcohols using 3D-COF as a potential heterogeneous ligand under sustainable conditions (i.e., solvent-free).
Najirul Haque; Surajit Biswas; Swarbhanu Ghosh; Arpita Hazra Chowdhury; Aslam Khan; Sk Manirul Islam. Zn(II)-Embedded Nanoporous Covalent Organic Frameworks for Catalytic Conversion of CO2 under Solvent-Free Conditions. ACS Applied Nano Materials 2021, 4, 7663 -7674.
AMA StyleNajirul Haque, Surajit Biswas, Swarbhanu Ghosh, Arpita Hazra Chowdhury, Aslam Khan, Sk Manirul Islam. Zn(II)-Embedded Nanoporous Covalent Organic Frameworks for Catalytic Conversion of CO2 under Solvent-Free Conditions. ACS Applied Nano Materials. 2021; 4 (8):7663-7674.
Chicago/Turabian StyleNajirul Haque; Surajit Biswas; Swarbhanu Ghosh; Arpita Hazra Chowdhury; Aslam Khan; Sk Manirul Islam. 2021. "Zn(II)-Embedded Nanoporous Covalent Organic Frameworks for Catalytic Conversion of CO2 under Solvent-Free Conditions." ACS Applied Nano Materials 4, no. 8: 7663-7674.
We have demonstrated the efficient synthesis of Pd(II)-based 2D mesoporous covalent organic framework (COF) along with a small amount of Pd(0), which is characterized by different characterization tools. These studies suggest that this material with low bandgap energy (Eg) of 1.73 eV can exhibit great photocatalytic activity toward CO2 fixation reaction. Therefore, we have applied the Pd(II)-loaded COF as a new and effective photocatalyst for the preparation of oxazolidinone through the chemical fixation of CO2. The reaction takes place in green solvent (H2O) in absence of any base and under the sunlight at atmospheric pressure of CO2 without using any cocatalyst. The reaction does not happen in the dark. In this context, we showed that a turnover number (TON) of 3.392 × 103 can be achieved using the catalytic cycle under sunlight. The light dependency of the reaction is also checked by a control experiment via light modulation between light on and off. Furthermore, the catalyst shows efficient reusability for multiple reaction cycles, and also the heterogeneity test of the material suggests minimal active metal leaching during the catalysis reaction cycles. These results for the photocatalytic synthesis of oxazolidinone by CO2 incorporation over COF under sunlight open a new environment-friendly green pathway for the formation of oxazolidinones.
P. Sarkar; A. Hazra Chowdhury; S. Biswas; A. Khan; S.M. Islam. 2D covalent organic framework: a photoactive heterogeneous catalyst for chemical fixation of CO2 over propargyl amines in water under sunlight. Materials Today Chemistry 2021, 21, 100509 .
AMA StyleP. Sarkar, A. Hazra Chowdhury, S. Biswas, A. Khan, S.M. Islam. 2D covalent organic framework: a photoactive heterogeneous catalyst for chemical fixation of CO2 over propargyl amines in water under sunlight. Materials Today Chemistry. 2021; 21 ():100509.
Chicago/Turabian StyleP. Sarkar; A. Hazra Chowdhury; S. Biswas; A. Khan; S.M. Islam. 2021. "2D covalent organic framework: a photoactive heterogeneous catalyst for chemical fixation of CO2 over propargyl amines in water under sunlight." Materials Today Chemistry 21, no. : 100509.
A Cell Endocytosis-Activated Fluorescent (CEAF) probe triggered by disaggregation and protonation is designed for high contrast in vivo bioimaging and diagnostics in the second near-infrared window (1000–1700 nm).
Yue He; Shangfeng Wang; Peng Yu; Kui Yan; Jiang Ming; Chenzhi Yao; Zuyang He; Ahmed Mohamed El-Toni; Aslam Khan; Xinyan Zhu; Caixia Sun; Zuhai Lei; Fan Zhang. NIR-II cell endocytosis-activated fluorescent probes for in vivo high-contrast bioimaging diagnostics. Chemical Science 2021, 12, 10474 -10482.
AMA StyleYue He, Shangfeng Wang, Peng Yu, Kui Yan, Jiang Ming, Chenzhi Yao, Zuyang He, Ahmed Mohamed El-Toni, Aslam Khan, Xinyan Zhu, Caixia Sun, Zuhai Lei, Fan Zhang. NIR-II cell endocytosis-activated fluorescent probes for in vivo high-contrast bioimaging diagnostics. Chemical Science. 2021; 12 (31):10474-10482.
Chicago/Turabian StyleYue He; Shangfeng Wang; Peng Yu; Kui Yan; Jiang Ming; Chenzhi Yao; Zuyang He; Ahmed Mohamed El-Toni; Aslam Khan; Xinyan Zhu; Caixia Sun; Zuhai Lei; Fan Zhang. 2021. "NIR-II cell endocytosis-activated fluorescent probes for in vivo high-contrast bioimaging diagnostics." Chemical Science 12, no. 31: 10474-10482.
Catalytic efficacy of metal-based catalysts can be significantly enhanced by doping graphene or its derivatives in the catalytic protocol. In continuation of previous work regarding the catalytic properties of highly-reduced graphene oxide (HRG), graphene-oxide (GO) doped mixed metal oxide-based nanocomposites, herein we report a simple, straightforward and solventless mechanochemical preparation of N-doped graphene (NDG)/mixed metal oxide-based nanocomposites of ZnO–MnCO3 (i.e., ZnO–MnCO3/(X%-NDG)), wherein N-doped graphene (NDG) is employed as a dopant. The nanocomposites were prepared by physical milling of separately fabricated NDG and ZnO–MnCO3 calcined at 300 °C through eco-friendly ball mill procedure. The as-obtained samples were characterized via X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), Raman, Field emission scanning electron microscopy (FESEM), Energy-dispersive X-ray spectroscopy (EDX) and surface area analysis techniques. To explore the effectiveness of the obtained materials, liquid-phase dehydrogenation of benzyl alcohol (BOH) to benzaldehyde (BH) was chosen as a benchmark reaction using eco-friendly oxidant (O2) without adding any harmful surfactants or additives. During the systematic investigation of reaction, it was revealed that the ZnO–MnCO3/NDG catalyst exhibited very distinct specific-activity (80 mmol/h.g) with a 100% BOH conversion and <99% selectivity towards BH in a very short time. The mechanochemically synthesized NDG-based nanocomposite showed remarkable enhancement in the catalytic performance and increased surface area compared with the catalyst without graphene (i.e., ZnO–MnCO3). Under the optimum catalytic conditions, the catalyst successfully transformed various aromatic, heterocyclic, allylic, primary, secondary and aliphatic alcohols to their respective ketones and aldehydes with high selectively and convertibility without over-oxidation to acids. In addition, the ZnO–MnCO3/NDG was also recycled up to six times with no apparent loss in its efficacy.
Mujeeb Khan; Syed Adil; Mohamed Assal; Abdulrahman Alharthi; Mohammed Shaik; Mufsir Kuniyil; Abdulrahman Al-Warthan; Aslam Khan; Zeeshan Nawaz; Hamid Shaikh; Mohammed Siddiqui. Solventless Mechanochemical Fabrication of ZnO–MnCO3/N-Doped Graphene Nanocomposite: Efficacious and Recoverable Catalyst for Selective Aerobic Dehydrogenation of Alcohols under Alkali-Free Conditions. Catalysts 2021, 11, 760 .
AMA StyleMujeeb Khan, Syed Adil, Mohamed Assal, Abdulrahman Alharthi, Mohammed Shaik, Mufsir Kuniyil, Abdulrahman Al-Warthan, Aslam Khan, Zeeshan Nawaz, Hamid Shaikh, Mohammed Siddiqui. Solventless Mechanochemical Fabrication of ZnO–MnCO3/N-Doped Graphene Nanocomposite: Efficacious and Recoverable Catalyst for Selective Aerobic Dehydrogenation of Alcohols under Alkali-Free Conditions. Catalysts. 2021; 11 (7):760.
Chicago/Turabian StyleMujeeb Khan; Syed Adil; Mohamed Assal; Abdulrahman Alharthi; Mohammed Shaik; Mufsir Kuniyil; Abdulrahman Al-Warthan; Aslam Khan; Zeeshan Nawaz; Hamid Shaikh; Mohammed Siddiqui. 2021. "Solventless Mechanochemical Fabrication of ZnO–MnCO3/N-Doped Graphene Nanocomposite: Efficacious and Recoverable Catalyst for Selective Aerobic Dehydrogenation of Alcohols under Alkali-Free Conditions." Catalysts 11, no. 7: 760.
In the present work, SnS thin films were prepared using the thermal evaporation technique at room temperature and varying annealing temperatures from 200 to 350 °C for photodetector applications. The prepared samples were characterized using different techniques for analyzing the structural, optical, morphological, and photosensing properties of the samples. From XRD analysis, the diffraction pattern of all the prepared thin films shows the pristine SnS phase of the samples possessing an orthorhombic phase without the presence of any impurity phases. Among the fabricated thin films, the SnS thin film annealed at a temperature of 300 °C reveals the highest crystallite size. The Raman results showed the vibrational modes of SnS films and with the increase in growth temperature, the peaks are slightly shifted towards the lower wavelength region. Morphological results show that the SnS thin films exhibit a uniform morphology of 2-D petal-like morphology with different sizes. The UV–vis spectroscopic study shows the decrease in the bandgap value of the samples with the increase in annealing temperature. The photosensing properties of the fabricated samples show the SnS sample annealed at 300 °C has a higher responsivity value of 6.40 × 10-2 AW-1, external quantum efficiency (EQE) value of 14.9%, and the detectivity value of 6.05 × 109 Jones. Finally, the transient photoresponse results suggest that the SnS annealed at 300 °C shows a rise and fall time of 1.5 and 2.5 s compared to the other samples which would be better suited for photodetector applications.
R. Balakarthikeyan; A. Santhanam; Aslam Khan; Ahmed M. El-Toni; Anees A. Ansari; Ahamad Imran; Mohd. Shkir; S. AlFaify. Performance analysis of SnS thin films fabricated using thermal evaporation technique for photodetector applications. Optik 2021, 244, 167460 .
AMA StyleR. Balakarthikeyan, A. Santhanam, Aslam Khan, Ahmed M. El-Toni, Anees A. Ansari, Ahamad Imran, Mohd. Shkir, S. AlFaify. Performance analysis of SnS thin films fabricated using thermal evaporation technique for photodetector applications. Optik. 2021; 244 ():167460.
Chicago/Turabian StyleR. Balakarthikeyan; A. Santhanam; Aslam Khan; Ahmed M. El-Toni; Anees A. Ansari; Ahamad Imran; Mohd. Shkir; S. AlFaify. 2021. "Performance analysis of SnS thin films fabricated using thermal evaporation technique for photodetector applications." Optik 244, no. : 167460.
Herein, facile CTAB surfactant-assisted synthesis of Pb1-xCuxS (x = 0, 0.1, 0.5, 1.0, 2.5 & 5.0 wt%) nanostructures (NSs) via a microwave route within 10 mins was attained and investigated for their structural, optical, vibrational, dielectric and electrical properties using X-ray diffraction, FT-Raman, UV–VIS, impedance and I-V measurements. Structural study with Rietveld refinement confirms the synthesis of PbS predominantly with cubic phase; however, at higher content of Cu some CuS peaks are detected. The values crystallite size of all Pb1-xCuxS specimens were determined between 19 and 25 nm and the specific surface area between 31 and 40 m2/g. Vibrational modes are noticed at 59.59, 74.05, 127.04, 268.82, 426.96, 601.49 cm−1 in all specimens confirmed cubic PbS NSs synthesis. As received powders were tested through DRS to evaluate the energy gap values via Kubelka-Munk model and noticed between 1.02 ± 0.01 to 1.37 ± 0.01 eV tuned with crystallite size. Dielectric studies reveal that the Cu doping enhanced the capacitance/dielectric constant and ac electrical conductivity of PbS NSs. Moreover, the I-V nature of the prepared Pb1-xCuxS NSs was measured, and dc conductivity was calculated and noticed to be enriched with Cu doping. The enhanced dielectric and electrical properties make the prepared materials useful for optoelectronic devices.
Mohd. Shkir; Baskaran Palanivel; Kamlesh V. Chandekar; Aslam Khan; Ahmed M. El-Toni; Anees A. Ansari; Rayees Ahmad Zargar; M.A. Sayed; S. AlFaify. Microwave-assisted synthesis of Cu doped PbS nanostructures with enhanced dielectric and electrical properties for optoelectronic applications. Materials Science and Engineering: B 2021, 271, 115268 .
AMA StyleMohd. Shkir, Baskaran Palanivel, Kamlesh V. Chandekar, Aslam Khan, Ahmed M. El-Toni, Anees A. Ansari, Rayees Ahmad Zargar, M.A. Sayed, S. AlFaify. Microwave-assisted synthesis of Cu doped PbS nanostructures with enhanced dielectric and electrical properties for optoelectronic applications. Materials Science and Engineering: B. 2021; 271 ():115268.
Chicago/Turabian StyleMohd. Shkir; Baskaran Palanivel; Kamlesh V. Chandekar; Aslam Khan; Ahmed M. El-Toni; Anees A. Ansari; Rayees Ahmad Zargar; M.A. Sayed; S. AlFaify. 2021. "Microwave-assisted synthesis of Cu doped PbS nanostructures with enhanced dielectric and electrical properties for optoelectronic applications." Materials Science and Engineering: B 271, no. : 115268.
Chromium oxide supported on mesoporous organo-silica (MOS) was synthesized with different Cr loading by an incipient method. The catalytic performance of a Cr(x)/MOS catalyst for CO2-based ethane dehydrogenation was investigated. The synthesized catalysts were characterized by XRD, BET, TEM, SEM, XPS, FTIR, and UV–Vis DR measurements. The textural properties of the prepared samples showed that the mesoporous nature of MOS sample was not disturbed by chromium impregnation. Among the prepared samples, Cr(8)/MOS catalyst exhibited good distribution of chromium species along with superior concentration of Cr6+ and the highest recorded Cr6+/Cr3+ ratio. The results revealed that the superior catalytic performance was reached at Cr(8)/MOS, with 50.4% and 90.1% of ethane conversion and ethylene selectivity, respectively. The catalytic activity decreased slowly over reaction time; it declined approximately 22% after 10 h of stream operation. The roles of CO2-based ethane dehydrogenation were also studied, where carbon dioxide can be a source of lattice oxygen and as a hydrogen consumer in reverse water–gas shift (RWGS) reaction. The effect of various catalytic factors, such as catalytic temperature, reaction time, space gas velocity, and CO2 partial pressure on the conversion of ethane, yield, and selectivity to ethylene, were investigated as well.
Abdulrhman Al-Awadi; Ahmed El-Toni; Joselito Labis; Aslam Khan; Hamid Ghaithan; Attiyah Al-Zahrani; Ahmed Abasaeed; Saeed Al-Zahrani. Mesoporous Organo-Silica Supported Chromium Oxide Catalyst for Oxidative Dehydrogenation of Ethane to Ethylene with CO2. Catalysts 2021, 11, 642 .
AMA StyleAbdulrhman Al-Awadi, Ahmed El-Toni, Joselito Labis, Aslam Khan, Hamid Ghaithan, Attiyah Al-Zahrani, Ahmed Abasaeed, Saeed Al-Zahrani. Mesoporous Organo-Silica Supported Chromium Oxide Catalyst for Oxidative Dehydrogenation of Ethane to Ethylene with CO2. Catalysts. 2021; 11 (5):642.
Chicago/Turabian StyleAbdulrhman Al-Awadi; Ahmed El-Toni; Joselito Labis; Aslam Khan; Hamid Ghaithan; Attiyah Al-Zahrani; Ahmed Abasaeed; Saeed Al-Zahrani. 2021. "Mesoporous Organo-Silica Supported Chromium Oxide Catalyst for Oxidative Dehydrogenation of Ethane to Ethylene with CO2." Catalysts 11, no. 5: 642.
We report the fabrication of Zn defect-influenced SnO2 sensor operating at room temperature. The films for the sensor were prepared by automatic nebulizer spray pyrolysis under a no-vacuum environment. Four different films were prepared with different Zn doping concentrations; 0 at.%, 1 at.% 3 at.% and 5 at.%. The X-ray diffraction analysis showed a tetragonal rutile structure with polycrystalline behavior for all films. The crystallinity was suppressed by Zn doping due to the influence of extrinsic donor defects. When increasing the Zn doping level, the bandgap is increased owing to the observed blue shift in the optical transmittance. The photoluminescence (PL) spectra of films show a UV emission at 361 nm which reveals near band edge (NBE) emission. And also, the intensity of the NBE emission decreases with an increase in Zn content due to the creation of defect states near the conduction band. The green emission intensity starts to increase with Zn doping indicates the excess oxygen vacancies (Vo) and/or oxygen interstitials in the host structure. These defects play a major role in controlling the interaction between the sensor surface and ammonia (NH3) molecules. NH3 gas sensing studies were carried out at room temperature for all the prepared films. A maximum sensitivity of 121% was exhibited by SnO2 sensor prepared by 3 at.% substitution of Zn. The maximum sensitivity is attributed to the presence of increased defects on the film surface. In addition, Zn doped SnO2 sensors exhibited fast response and recovery times when compared with the undoped sensor. The optimum sensor (3 at.% of Zn) exhibited good repeatability and reproducibility of sensor performance. The aging effect on the sensing behavior showed the maintenance of stability above 90% for the aged film (100 days) when compared with the fresh film.
M. Boomashri; P. Perumal; Aslam Khan; Ahmed M. El-Toni; Anees A Ansari; Ravindra K. Gupta; Prashantha Murahari; K. Deva Arun Kumar. Zinc influence on nanostructured tin oxide (SnO2) films as ammonia sensor at room temperature. Surfaces and Interfaces 2021, 25, 101195 .
AMA StyleM. Boomashri, P. Perumal, Aslam Khan, Ahmed M. El-Toni, Anees A Ansari, Ravindra K. Gupta, Prashantha Murahari, K. Deva Arun Kumar. Zinc influence on nanostructured tin oxide (SnO2) films as ammonia sensor at room temperature. Surfaces and Interfaces. 2021; 25 ():101195.
Chicago/Turabian StyleM. Boomashri; P. Perumal; Aslam Khan; Ahmed M. El-Toni; Anees A Ansari; Ravindra K. Gupta; Prashantha Murahari; K. Deva Arun Kumar. 2021. "Zinc influence on nanostructured tin oxide (SnO2) films as ammonia sensor at room temperature." Surfaces and Interfaces 25, no. : 101195.
Two-dimensional carbon materials, incorporating a large mesoporosity, are attracting considerable research interest in various fields such as catalysis, electrochemistry, and energy-related technologies owing to their integrated functionalities. However, their potential applications, which require favorable mass transport within mesopore channels, are constrained by the undesirable and finite mesostructural configurations due to the immense synthetic difficulties. Herein, we demonstrate an oriented monomicelle assembly strategy, for the facile fabrication of highly ordered mesoporous carbon thin films with vertically aligned and permeable mesopore channels. Such a facile and reproducible approach relies on the swelling and fusion effect of hydrophobic benzene homologues for directional monomicelle assembly. The orientation assembly process shows precise controllability and great universality, affording mesoporous carbon films with a cracking-free structure over a centimeter in size, highly tunable thicknesses (13 to 85 nm, an interval of ∼12 nm), mesopore size (8.4 to 13.5 nm), and switchable growth substrates. Owing to their large permeable mesopore channels, electrochemical sensors based on vertical mesoporous carbon films exhibit an ultralow limit of detection (50 nmol L–1) and great sensitivity in dopamine detection.
Ruicong Wang; Kun Lan; Runfeng Lin; Xinxin Jing; Chin-Te Hung; Xingmiao Zhang; Liangliang Liu; Yi Yang; Gang Chen; Xiaoguo Liu; Chunhai Fan; Ahmed Mohamed El-Toni; Aslam Khan; Yun Tang; Dongyuan Zhao. Precisely Controlled Vertical Alignment in Mesostructured Carbon Thin Films for Efficient Electrochemical Sensing. ACS Nano 2021, 15, 7713 -7721.
AMA StyleRuicong Wang, Kun Lan, Runfeng Lin, Xinxin Jing, Chin-Te Hung, Xingmiao Zhang, Liangliang Liu, Yi Yang, Gang Chen, Xiaoguo Liu, Chunhai Fan, Ahmed Mohamed El-Toni, Aslam Khan, Yun Tang, Dongyuan Zhao. Precisely Controlled Vertical Alignment in Mesostructured Carbon Thin Films for Efficient Electrochemical Sensing. ACS Nano. 2021; 15 (4):7713-7721.
Chicago/Turabian StyleRuicong Wang; Kun Lan; Runfeng Lin; Xinxin Jing; Chin-Te Hung; Xingmiao Zhang; Liangliang Liu; Yi Yang; Gang Chen; Xiaoguo Liu; Chunhai Fan; Ahmed Mohamed El-Toni; Aslam Khan; Yun Tang; Dongyuan Zhao. 2021. "Precisely Controlled Vertical Alignment in Mesostructured Carbon Thin Films for Efficient Electrochemical Sensing." ACS Nano 15, no. 4: 7713-7721.
Iron nanoparticles are used as a targeted drug delivery system. The nanocarrier itself can be genotoxic, trigger oxidative stress or cell death. Therefore, we developed an AC/DC magnetic syringe for injecting, stimulating drug release and safe removing of the nanocarrier. Alongside we optimized the method for nanoparticles’ drug release kinetics and testing cytotoxicity in vitro.
Milorad Zjalić; Mislav Mustapić; Zvonko Glumac; Ivan Prološčić; Senka Blažetić; Ana Vuković; Mostafa Masud; Motasim Billah; Aslam Khan; Suzana Šegota; Shahriar Al Hossain; Marija Heffer. Construction of AC/DC magnetic syringe device for stimulated drug release, injection and ejection of nanocarriers and testing cytotoxicity in vitro. MethodsX 2021, 8, 101312 .
AMA StyleMilorad Zjalić, Mislav Mustapić, Zvonko Glumac, Ivan Prološčić, Senka Blažetić, Ana Vuković, Mostafa Masud, Motasim Billah, Aslam Khan, Suzana Šegota, Shahriar Al Hossain, Marija Heffer. Construction of AC/DC magnetic syringe device for stimulated drug release, injection and ejection of nanocarriers and testing cytotoxicity in vitro. MethodsX. 2021; 8 ():101312.
Chicago/Turabian StyleMilorad Zjalić; Mislav Mustapić; Zvonko Glumac; Ivan Prološčić; Senka Blažetić; Ana Vuković; Mostafa Masud; Motasim Billah; Aslam Khan; Suzana Šegota; Shahriar Al Hossain; Marija Heffer. 2021. "Construction of AC/DC magnetic syringe device for stimulated drug release, injection and ejection of nanocarriers and testing cytotoxicity in vitro." MethodsX 8, no. : 101312.
Herein, a facile fabrication of gold (Au) doped lead iodide (PbI2) ([email protected]2) thin films have been achieved via spin-coating process from the microwave-synthesized [email protected]2 nanosheets for the first time. Phase was confirmed from X-ray diffraction and FT-Raman spectroscopy analyses and approved 2H-Polytype of PbI2. The grain sizes were estimated via atomic force microscopy (AFM) and noticed between 13.5 and 9.2 nm for PbI2 and [email protected]2 sample respectively. The Au doping in PbI2 was seen in EDX spectra and its homogeneity in SEM e-mapping. The nanostructured films fabrication was confirmed by SEM/AFM images. The transmittance of grown films is quite good in the visible region and reduction was seen in [email protected]2 film compare to pristine. The energy gaps were estimated ~2.41 eV for pure and 2.45 eV for [email protected]2 films. The value of refractive index was noticed ~2 in lower wavelength region. Dielectric constant and loss values were also determined. The highest values of nonlinear parameters like χ1, χ1 and n2 are found to be 0.68, 3.5 × 10−11 (esu) and 4.3 × 10−10 (esu) respectively at 1.11 eV of energy.
Mohd. Shkir; Kamlesh V. Chandekar; Aslam Khan; El Sayed Yousef; H. Elhosiny Ali; H. Algarni; Ahmed Mohamed El-Toni; Anees A. Ansari; S. AlFaify. Facile fabrication of novel nanostructured [email protected] thin films and their structure, optical and NLO studies for higher order nonlinear applications. Materials Chemistry and Physics 2021, 265, 124458 .
AMA StyleMohd. Shkir, Kamlesh V. Chandekar, Aslam Khan, El Sayed Yousef, H. Elhosiny Ali, H. Algarni, Ahmed Mohamed El-Toni, Anees A. Ansari, S. AlFaify. Facile fabrication of novel nanostructured [email protected] thin films and their structure, optical and NLO studies for higher order nonlinear applications. Materials Chemistry and Physics. 2021; 265 ():124458.
Chicago/Turabian StyleMohd. Shkir; Kamlesh V. Chandekar; Aslam Khan; El Sayed Yousef; H. Elhosiny Ali; H. Algarni; Ahmed Mohamed El-Toni; Anees A. Ansari; S. AlFaify. 2021. "Facile fabrication of novel nanostructured [email protected] thin films and their structure, optical and NLO studies for higher order nonlinear applications." Materials Chemistry and Physics 265, no. : 124458.
A successful flash combustion synthesis of NiO spherical nanoparticles with various contents of lanthanum (La) doping ([email protected] SNPs) with remarkably enhanced dielectric and electrical properties are reported. Single phase has been confirmed through X-ray diffraction and FT-Raman spectroscopic analysis. Increasing La content in NiO reduced the crystallite size by 341% to 6.65 nm from 22.70 nm. The composition of elements in the final product was assessed via EDX analysis. Moreover, monophasic [email protected] SNPs synthesis with size reduction was observed using field emission scanning electron microscopy (FESEM). A red shift in optical energy gaps (3.52–3.26 eV) was observed with increasing La contents from pure to 10 wt%. Capacitance (109–964 PF), impedance (9.41 × 104–1.67 × 104 kΩ), dielectric constant (100–967), dielectric loss (335–10666), and electrical conductivity (4–5 S/m) values were remarkably improved with La doping. The current (I)–voltage (V) characteristics of pure and [email protected] NPs were performed under the biased voltage of ±20 V. Current was noticed in the range of (3.81 × 10−4–9.91 × 10−3 amp) at pure, 1.0, 3.0, 5.0, and 10 wt% of [email protected] NPs. Enhancements in the dielectric and electrical properties of as-synthesized NPs make them suitable for optoelectronics uses.
Mohd Shkir; Aslam Khan; Kamlesh V. Chandekar; M.A. Sayed; Ahmed Mohamed El-Toni; Anees A. Ansari; Syed F. Adil; Hamid Ghaithan; H. Algarni; S. AlFaify. Dielectric and electrical properties of [email protected] SNPs for high-performance optoelectronic applications. Ceramics International 2021, 47, 15611 -15621.
AMA StyleMohd Shkir, Aslam Khan, Kamlesh V. Chandekar, M.A. Sayed, Ahmed Mohamed El-Toni, Anees A. Ansari, Syed F. Adil, Hamid Ghaithan, H. Algarni, S. AlFaify. Dielectric and electrical properties of [email protected] SNPs for high-performance optoelectronic applications. Ceramics International. 2021; 47 (11):15611-15621.
Chicago/Turabian StyleMohd Shkir; Aslam Khan; Kamlesh V. Chandekar; M.A. Sayed; Ahmed Mohamed El-Toni; Anees A. Ansari; Syed F. Adil; Hamid Ghaithan; H. Algarni; S. AlFaify. 2021. "Dielectric and electrical properties of [email protected] SNPs for high-performance optoelectronic applications." Ceramics International 47, no. 11: 15611-15621.
The photocatalytic carboxylation of aryl derivatives was demonstrated under CO2 at atmospheric pressure using a mesoporous COF as the active photocatalyst with triethylamine (TEA) as a sacrificial electron source under visible light.
Pekham Chakrabortty; Anjan Das; Arpita Hazra Chowdhury; Swarbhanu Ghosh; Aslam Khan; Sk. Manirul Islam. Light-induced carboxylation of aryl derivatives with cooperative COF as an active photocatalyst and Ni(ii) co-catalyst. New Journal of Chemistry 2021, 45, 4738 -4745.
AMA StylePekham Chakrabortty, Anjan Das, Arpita Hazra Chowdhury, Swarbhanu Ghosh, Aslam Khan, Sk. Manirul Islam. Light-induced carboxylation of aryl derivatives with cooperative COF as an active photocatalyst and Ni(ii) co-catalyst. New Journal of Chemistry. 2021; 45 (10):4738-4745.
Chicago/Turabian StylePekham Chakrabortty; Anjan Das; Arpita Hazra Chowdhury; Swarbhanu Ghosh; Aslam Khan; Sk. Manirul Islam. 2021. "Light-induced carboxylation of aryl derivatives with cooperative COF as an active photocatalyst and Ni(ii) co-catalyst." New Journal of Chemistry 45, no. 10: 4738-4745.
The effect of laponite® clay dispersion on the electrical, structural, optical, thermal, and photovoltaic properties of [poly (ethylene oxide)-succinonitrile]-LiI-I2 solid polymer electrolytes is reported for the first time. The nanoclay belongs to the family of smectite clay minerals and offers a high surface-to-volume ratio, charged surface, galleries, and ionic species. The dispersion has increased the room-temperature electrical conductivity to ~0.5 mS cm−1 for the optimum conducting electrolyte (OCE; x = 2.5%) without altering the pseudo-activation energy. The change is explained using the percolation model utilizing the formation of a space-charge region by the clay. Fourier-transform infrared spectroscopy reveals the greater interaction between clay and succinonitrile than clay and poly (ethylene oxide) and the formation of amorphous domains for the OCE. X-ray diffractometry study shows a shift toward the lower angle for the amorphous hump of the OCE. The OCE exhibits a ~123% increase in short-circuit current density, ~28% decrease in open-circuit voltage, and 29–64% decrease in charge-transfer and Warburg resistances, inferring the active role of the clay in improving the Li+ ion intercalation into and/or adsorption onto the TiO2. This has resulted in 54% increase in cell efficiency (~3.7% at solar irradiance of 100 mW cm−2).
Ravindra Kumar Gupta; Hee-Woo Rhee; Idriss Bedja; Abdulaziz N. AlHazaa; Aslam Khan. Effect of Laponite® nanoclay dispersion on electrical, structural, and photovoltaic properties of dispersed [Poly(Ethylene oxide)-succinonitrile]-LiI-I2 solid polymer electrolyte. Journal of Power Sources 2021, 490, 229509 .
AMA StyleRavindra Kumar Gupta, Hee-Woo Rhee, Idriss Bedja, Abdulaziz N. AlHazaa, Aslam Khan. Effect of Laponite® nanoclay dispersion on electrical, structural, and photovoltaic properties of dispersed [Poly(Ethylene oxide)-succinonitrile]-LiI-I2 solid polymer electrolyte. Journal of Power Sources. 2021; 490 ():229509.
Chicago/Turabian StyleRavindra Kumar Gupta; Hee-Woo Rhee; Idriss Bedja; Abdulaziz N. AlHazaa; Aslam Khan. 2021. "Effect of Laponite® nanoclay dispersion on electrical, structural, and photovoltaic properties of dispersed [Poly(Ethylene oxide)-succinonitrile]-LiI-I2 solid polymer electrolyte." Journal of Power Sources 490, no. : 229509.
The ZnO-based ternary heterostructure ZnO/Eu2O3/NiO nanoparticles are synthesized using waste curd as fuel by a simple one-pot combustion method. The as-synthesized heterostructure is characterized by using various spectroscopic and microscopic techniques including X-ray diffraction, UV–vis, FTIR, SEM, and TEM analyses. The photocatalytic activity of the ternary nanocomposite was tested for the photodegradation of methylene blue (MB) under solar light irradiation. The results have revealed that the ternary ZnO/Eu2O3/NiO photocatalyst exhibits excellent performance toward the photocatalytic degradation of the studied dye. Optimization studies revealed that the synthesized heterostructure exhibited a pH-dependent photocatalytic activity, and better results are obtained for specific concentrations of dye and catalysts. Among the different light sources employed during the study, the catalyst was found to possess the best degradation efficiency in visible light.
J. Pranesh Shubha; Syed F. Adil; Mujeeb Khan; Mohammad R. Hatshan; Aslam Khan. Facile Fabrication of a ZnO/Eu2O3/NiO-Based Ternary Heterostructure Nanophotocatalyst and Its Application for the Degradation of Methylene Blue. ACS Omega 2021, 6, 3866 -3874.
AMA StyleJ. Pranesh Shubha, Syed F. Adil, Mujeeb Khan, Mohammad R. Hatshan, Aslam Khan. Facile Fabrication of a ZnO/Eu2O3/NiO-Based Ternary Heterostructure Nanophotocatalyst and Its Application for the Degradation of Methylene Blue. ACS Omega. 2021; 6 (5):3866-3874.
Chicago/Turabian StyleJ. Pranesh Shubha; Syed F. Adil; Mujeeb Khan; Mohammad R. Hatshan; Aslam Khan. 2021. "Facile Fabrication of a ZnO/Eu2O3/NiO-Based Ternary Heterostructure Nanophotocatalyst and Its Application for the Degradation of Methylene Blue." ACS Omega 6, no. 5: 3866-3874.
Nickel oxide is found to have a wide-range of applications in opto-electronic fields. So, we have synthesized the NiO with 0, 1, 2.5, 5 and 7.5 wt% Ce ion through one pot flash combustion route facilely at 450 °C and subjected to various state of art-excremental studies. Structural study points out that the major phase is belongs to cubic NiO, however, low intensity peaks were observed for cubic CeO2 as well. Hence, it confirms the Ce doping in NiO. This was further confirmed from FT-Raman spectroscopy analysis in which the extra vibrational mode at 450 ± 5 is belongs to Ce2O at higher content of Ce. Further confirmation of Ce presence and its homogeneity in the final product was approved through energy dispersive X-ray spectroscopy/e-mapping measurements. The morphological investigation was done by SEM and Field emission-SEM which confirm the formation of low dimension nanoparticles of size within the range of 41–75 nm. Diffused reflectance spectra were used to obtain energy gap using Kubelka-Munk relation and noticed in range of 3.42–3.55 eV for [email protected] NPs. Frequency dependent dielectric and electrical properties were also studied and discussed in detail.
Mohd Shkir; Kamlesh V. Chandekar; Aslam Khan; T. Alshahrani; Ahmed Mohamed El-Toni; M.A. Sayed; A.K. Singh; Anees A. Ansari; M.R. Muthumareeswaran; Ali Aldalbahi; Ravindra Kumar Gupta; S. AlFaify. Tailoring the structure-morphology-vibrational-optical-dielectric and electrical characteristics of [email protected] NPs produced by facile combustion route for optoelectronics. Materials Science in Semiconductor Processing 2021, 126, 105647 .
AMA StyleMohd Shkir, Kamlesh V. Chandekar, Aslam Khan, T. Alshahrani, Ahmed Mohamed El-Toni, M.A. Sayed, A.K. Singh, Anees A. Ansari, M.R. Muthumareeswaran, Ali Aldalbahi, Ravindra Kumar Gupta, S. AlFaify. Tailoring the structure-morphology-vibrational-optical-dielectric and electrical characteristics of [email protected] NPs produced by facile combustion route for optoelectronics. Materials Science in Semiconductor Processing. 2021; 126 ():105647.
Chicago/Turabian StyleMohd Shkir; Kamlesh V. Chandekar; Aslam Khan; T. Alshahrani; Ahmed Mohamed El-Toni; M.A. Sayed; A.K. Singh; Anees A. Ansari; M.R. Muthumareeswaran; Ali Aldalbahi; Ravindra Kumar Gupta; S. AlFaify. 2021. "Tailoring the structure-morphology-vibrational-optical-dielectric and electrical characteristics of [email protected] NPs produced by facile combustion route for optoelectronics." Materials Science in Semiconductor Processing 126, no. : 105647.
We report the optical properties of thermally evaporated rare-earth (Dy) doped (GeS2)80(In2S3)20 thin film. Film of thickness 1100 nm has been deposited on a microscopic glass slide, and the as-prepared thin film has been characterized using X-ray diffraction, energy dispersive spectroscopy and UV–visible–near infrared spectroscopy. With annealing temperature, the refractive index is noticed to decrease from 2.51 to 2.27, while the optical bandgap is observed to increase from 2.03 to 2.29. The dispersion of the refractive index n for as prepared and annealed thin films have discussed using the single oscillator model proposed by the Wemple–Di Domenico relationship. The observed value of Eo (5.31–4.40 eV) and dispersion energy Ed (28.22–18.18 eV) are decreasing for as prepared and annealed thin films. The increase of bandgap has been explained in terms of the disorder in the system.
Pankaj Sharma; Vineet Sharma; Ekta Sharma; A. Dahshan; K. A. Aly; Pawan Kumar; Aslam Khan; Ashok Kumar. Rare-earth (Dy)-doped (GeS2)80(In2S3)20 thin film: influence of annealing temperature in argon environment on the linear and nonlinear optical parameters. Applied Physics A 2021, 127, 1 -10.
AMA StylePankaj Sharma, Vineet Sharma, Ekta Sharma, A. Dahshan, K. A. Aly, Pawan Kumar, Aslam Khan, Ashok Kumar. Rare-earth (Dy)-doped (GeS2)80(In2S3)20 thin film: influence of annealing temperature in argon environment on the linear and nonlinear optical parameters. Applied Physics A. 2021; 127 (1):1-10.
Chicago/Turabian StylePankaj Sharma; Vineet Sharma; Ekta Sharma; A. Dahshan; K. A. Aly; Pawan Kumar; Aslam Khan; Ashok Kumar. 2021. "Rare-earth (Dy)-doped (GeS2)80(In2S3)20 thin film: influence of annealing temperature in argon environment on the linear and nonlinear optical parameters." Applied Physics A 127, no. 1: 1-10.
Continuing our previous research work on a drug delivery system based on combined AC/DC magnetic fields, we have developed a prototype AC/DC magnetic syringe device for stimulation of drug release from drug carriers, with the options of injecting/removing drug carriers. The porous Fe3O4 carrier, in a dose-dependent manner, causes acute oxidative damage and reduces the viability of differentiated SH-SY5Y human neuroblastoma cells, indicating the necessity for its removal once it reaches the therapeutic concentration at the target tissue. The working mechanism of the device consists of three simple steps. First, direct injection of the drug adsorbed on the surface of a carrier via a needle inserted into the targeted area. The second step is stimulation of drug release using a combination of AC magnetic field (a coil magnetised needle with AC current) and permanent magnets (DC magnetic lens outside of the body), and the third step is removal of the drug carriers from the injected area after the completion of drug release by magnetising the tip of the needle with DC current. Removing the drug carriers allows us to avoid possible acute and long term side effects of the drug carriers in the patient's body, as well as any potential response of the body to the drug carriers.
Mislav Mustapić; Zvonko Glumac; Marija Heffer; Milorad Zjalić; Ivan Prološčić; Mostafa Masud; Senka Blažetić; Ana Vuković; Motasim Billah; Aslam Khan; Suzana Šegota; Shahriar Al Hossain. AC/DC magnetic device for safe medical use of potentially harmful magnetic nanocarriers. Journal of Hazardous Materials 2020, 409, 124918 .
AMA StyleMislav Mustapić, Zvonko Glumac, Marija Heffer, Milorad Zjalić, Ivan Prološčić, Mostafa Masud, Senka Blažetić, Ana Vuković, Motasim Billah, Aslam Khan, Suzana Šegota, Shahriar Al Hossain. AC/DC magnetic device for safe medical use of potentially harmful magnetic nanocarriers. Journal of Hazardous Materials. 2020; 409 ():124918.
Chicago/Turabian StyleMislav Mustapić; Zvonko Glumac; Marija Heffer; Milorad Zjalić; Ivan Prološčić; Mostafa Masud; Senka Blažetić; Ana Vuković; Motasim Billah; Aslam Khan; Suzana Šegota; Shahriar Al Hossain. 2020. "AC/DC magnetic device for safe medical use of potentially harmful magnetic nanocarriers." Journal of Hazardous Materials 409, no. : 124918.
The authors report on the synthesis of Fe–NiO nanoparticles (Fe–NiO NPs) with a spherical shape via facile flash combustion synthesis. A structural test shows cubic formations of Fe–NiO NPs in all Fe concentrations. A reduction in crystallite size was observed with increasing Fe content from 27 nm to 12 nm. A vibrational study also indicates a cubic Fe–NiO NPs structure. However, slight shifts in peak positions were observed during Fe doping in NiO. The existence of Fe in NiO product was confirmed using energy dispersive X-ray (EDX) analysis, and its homogeneity in the final products was observed in scanning electron microscopy (SEM) e-mapping images. An X‐ray photoelectron spectroscopy (XPS) study was also carried out to confirm the incorporation of Fe in NiO matrix. A field-emission scanning electron microscopy (FESEM) study showed the formation of spherical nanoparticles in all Fe–NiO NPs samples. However, it was noted that the grain size reduced with increasing Fe content, which is in agreement with the X-ray diffraction (XRD) results. Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) with a selected area electron diffraction (SAED) curve indicate very low-dimension NP formation from NiO. An optical test was performed based on the Kubelka-Munk theory along with an estimation of energy gas, which showed an increase of 3.5–3.75 eV with Fe content doping in NiO. Furthermore, the possibility of applying spherical Fe–NiO NPs as an electrode material was also assessed in a three-electrode assembly cell, and the results show that the NiO doped with 5% of Fe exhibited superior capacitance performance (F4, 297.67 F g-1) compared to the other samples.
Aslam Khan; Mohd Shkir; Sajid Ali Ansari; Nazish Parveen; S. AlFaify; Ahmed Mohamed El-Toni; Ravindra Kumar Gupta; Syed Farooq Adil. One-pot flash combustion synthesis of [email protected] nanocomposites for supercapacitor applications. Ceramics International 2020, 47, 9024 -9033.
AMA StyleAslam Khan, Mohd Shkir, Sajid Ali Ansari, Nazish Parveen, S. AlFaify, Ahmed Mohamed El-Toni, Ravindra Kumar Gupta, Syed Farooq Adil. One-pot flash combustion synthesis of [email protected] nanocomposites for supercapacitor applications. Ceramics International. 2020; 47 (7):9024-9033.
Chicago/Turabian StyleAslam Khan; Mohd Shkir; Sajid Ali Ansari; Nazish Parveen; S. AlFaify; Ahmed Mohamed El-Toni; Ravindra Kumar Gupta; Syed Farooq Adil. 2020. "One-pot flash combustion synthesis of [email protected] nanocomposites for supercapacitor applications." Ceramics International 47, no. 7: 9024-9033.
A novel hydrophobic Canola oil-based nanocomposite anticorrosive coating material with different contents of fumes silica (FS) was successfully synthesized via an in situ method. Firstly, a Canola oil-based hydroxyl terminated poly (oxalate-amide) was prepared by a two-step process of amidation and condensation. Secondly, the dispersion of fumed silica (1 to 3 wt.%) in hydroxyl terminated poly (oxalate-amide) was carried out, followed by reaction with toluene-2,4- diisocyanate (TDI) in order to form poly (urethane-oxalate-amide)/fumed silica nanocomposite. The structure and properties of nanocomposite were analyzed by FTIR, NMR (1H/13C), TGA/DTA, DSC, contact angle, and SEM. The physico-mechanical and electrochemical tests were performed in order to check the performance of nanocomposite coating. The results reveal that FS is homogenously dispersed in poly (urethane-oxalate-amide) matrix with a loading amount of less than 3 wt.%. The performance of nanocomposite coating improved when compared to virgin polymer. The synthesized nanocomposite coating can be used in the field of hydrophobic anticorrosive coatings.
Manawwer Alam; Naser Alandis; Naushad Ahmad; Fahmina Zafar; Aslam Khan; Mohammad Alam. Development of Hydrophobic, Anticorrosive, Nanocomposite Polymeric Coatings from Canola Oil: A Sustainable Resource. Polymers 2020, 12, 2886 .
AMA StyleManawwer Alam, Naser Alandis, Naushad Ahmad, Fahmina Zafar, Aslam Khan, Mohammad Alam. Development of Hydrophobic, Anticorrosive, Nanocomposite Polymeric Coatings from Canola Oil: A Sustainable Resource. Polymers. 2020; 12 (12):2886.
Chicago/Turabian StyleManawwer Alam; Naser Alandis; Naushad Ahmad; Fahmina Zafar; Aslam Khan; Mohammad Alam. 2020. "Development of Hydrophobic, Anticorrosive, Nanocomposite Polymeric Coatings from Canola Oil: A Sustainable Resource." Polymers 12, no. 12: 2886.