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Co3O4/[email protected] graphene oxide (NGO) composite materials were synthesized through a sonication-assisted thermal reduction method in the presence of cobalt and ruthenium starting reagents for supercapacitor and gas sensor applications. The composite materials were characterized using various analytical tools to confirm the structural and morphological properties. The synthesized Co3O4/[email protected] composites showed the nanostructured grains anchored on the NGO surface. The electrochemical storage performance was studied by using cyclic voltammetry, galvanostatic charge discharge, and electrochemical impedance spectroscopy using a two-electrode asymmetric configuration. The prepared Co3O4/[email protected] electrode exhibited a maximum capacitance of ~149 F/g at an applied current of ~0.5 A/g, an energy density of 20.69 Wh kg−1, and at a power density of 250 W kg−1. The cycling behavior of the fabricated asymmetric capacitor revealed a 90% capacitance retention after 5000 cycles. Moreover, the prepared composite material was used successfully for dimethyl methylophosphonate (DMMP) vapor detection, showing excellent sensitivity, selectivity, and stability. Therefore, the constructed Co3O4/[email protected] composite is a suitable material for supercapacitors and DMMP gas-detection applications.
Sivalingam Ramesh; Young‐Jun Lee; Kyeongho Shin; Lama Sanjeeb; K. Karuppasamy; Dhanasekaran Vikraman; Adaikalam Kathalingam; Hyun‐Seok Kim; Heung Soo Kim; Joo‐Hyung Kim. Effect of ruthenium oxide on the capacitance and gas‐sensing performances of cobalt oxide @nitrogen‐doped graphene oxide composites. International Journal of Energy Research 2021, 1 .
AMA StyleSivalingam Ramesh, Young‐Jun Lee, Kyeongho Shin, Lama Sanjeeb, K. Karuppasamy, Dhanasekaran Vikraman, Adaikalam Kathalingam, Hyun‐Seok Kim, Heung Soo Kim, Joo‐Hyung Kim. Effect of ruthenium oxide on the capacitance and gas‐sensing performances of cobalt oxide @nitrogen‐doped graphene oxide composites. International Journal of Energy Research. 2021; ():1.
Chicago/Turabian StyleSivalingam Ramesh; Young‐Jun Lee; Kyeongho Shin; Lama Sanjeeb; K. Karuppasamy; Dhanasekaran Vikraman; Adaikalam Kathalingam; Hyun‐Seok Kim; Heung Soo Kim; Joo‐Hyung Kim. 2021. "Effect of ruthenium oxide on the capacitance and gas‐sensing performances of cobalt oxide @nitrogen‐doped graphene oxide composites." International Journal of Energy Research , no. : 1.
This study aimed to establish a rapid in vitro plant regeneration method from rhizome buds of Kaempferia parviflora to obtain the valuable secondary metabolites with antioxidant and enzyme inhibition properties. The disinfection effect of silver oxide nanoparticles (AgO NPs) on rhizome and effects of plant growth regulators on shoot multiplication and subsequent rooting were investigated. Surface sterilization of rhizome buds with sodium hypochlorite was insufficient to control contamination. However, immersing rhizome buds in 100 mg L−1 AgO NPs for 60 min eliminated contamination without affecting the survival of explants. The number of shoots (12.2) produced per rhizome bud was higher in Murashige and Skoog (MS) medium containing 8 µM of 6-Benzyladenine (6-BA) and 0.5 µM of Thidiazuron (TDZ) than other treatments. The highest number of roots (24), with a mean root length of 7.8 cm and the maximum shoot length (9.8 cm), were obtained on medium MS with 2 µM of Indole-3-butyric acid (IBA). A survival rate of 98% was attained when plantlets of K. parviflora were acclimatized in a growth room. Liquid chromatography with tandem mass spectrometry (LC-MS/MS) was used to determine the chemical profile of K. parviflora leaf extracts. Results showed that several biologically active flavonoids reported in rhizomes were also present in leaf tissues of both in vitro cultured and ex vitro (greenhouse-grown) plantlets of K. parviflora. We found 40 and 36 compounds in in vitro cultured and ex vitro grown leaf samples, respectively. Greenhouse leaves exhibited more potent antioxidant activities than leaves from in vitro cultures. A higher acetylcholinesterase inhibitory ability was obtained for greenhouse leaves (1.07 mg/mL). However, leaves from in vitro cultures exhibited stronger butyrylcholinesterase inhibitory abilities. These results suggest that leaves of K. parviflora, as major byproducts of black ginger cultivation, could be used as valuable alternative sources for extracting bioactive compounds.
Han-Yong Park; Kyung-Su Kim; Gunes Ak; Gokhan Zengin; Zoltán Cziáky; József Jekő; Kathalingam Adaikalam; Kihwan Song; Doo-Hwan Kim; Iyyakkannu Sivanesan. Establishment of a Rapid Micropropagation System for Kaempferia parviflora Wall. Ex Baker: Phytochemical Analysis of Leaf Extracts and Evaluation of Biological Activities. Plants 2021, 10, 698 .
AMA StyleHan-Yong Park, Kyung-Su Kim, Gunes Ak, Gokhan Zengin, Zoltán Cziáky, József Jekő, Kathalingam Adaikalam, Kihwan Song, Doo-Hwan Kim, Iyyakkannu Sivanesan. Establishment of a Rapid Micropropagation System for Kaempferia parviflora Wall. Ex Baker: Phytochemical Analysis of Leaf Extracts and Evaluation of Biological Activities. Plants. 2021; 10 (4):698.
Chicago/Turabian StyleHan-Yong Park; Kyung-Su Kim; Gunes Ak; Gokhan Zengin; Zoltán Cziáky; József Jekő; Kathalingam Adaikalam; Kihwan Song; Doo-Hwan Kim; Iyyakkannu Sivanesan. 2021. "Establishment of a Rapid Micropropagation System for Kaempferia parviflora Wall. Ex Baker: Phytochemical Analysis of Leaf Extracts and Evaluation of Biological Activities." Plants 10, no. 4: 698.
Photocatalytic remediation has become a potential method for the industrial wastewater purification. In this treatment method optically active metal-oxide nanoparticle-based adsorbents are employed for the removal dyes and heavy metals from the industrial wastewater. In this work, we have studied polymer and carbon-based materials along with metal oxide nanoparticles. Zinc oxide (ZnO), graphene oxide (GO) and polyvinyl alcohol polymer nanoparticles in the degradation efficiency on the three vicious and most used industrial dyes crystal violet CV), methylene blue (MB) and trypan blue (TB) is reported. The synthesized nanoparticles are characterized using XRD, SEM, FTIR and UV–vis spectroscopy for their structural and optical properties. Photocatalytic degradation efficiency of the nanoadsorbents on the various dyes was examined for 7 h and 24 h, and they were analyzed using UV and FTIR spectroscopies. Among all the three nanoparticle the GO has produced best degradation results on all the three dyes.
Geetha Kathiresan; Kavithayeni Vijayakumar; Akash Prabhu Sundarrajan; Hyun-Seok Kim; Kathalingam Adaikalam. Photocatalytic degradation efficiency of ZnO, GO and PVA nanoadsorbents for crystal violet, methylene blue and trypan blue dyes. Optik 2021, 238, 166671 .
AMA StyleGeetha Kathiresan, Kavithayeni Vijayakumar, Akash Prabhu Sundarrajan, Hyun-Seok Kim, Kathalingam Adaikalam. Photocatalytic degradation efficiency of ZnO, GO and PVA nanoadsorbents for crystal violet, methylene blue and trypan blue dyes. Optik. 2021; 238 ():166671.
Chicago/Turabian StyleGeetha Kathiresan; Kavithayeni Vijayakumar; Akash Prabhu Sundarrajan; Hyun-Seok Kim; Kathalingam Adaikalam. 2021. "Photocatalytic degradation efficiency of ZnO, GO and PVA nanoadsorbents for crystal violet, methylene blue and trypan blue dyes." Optik 238, no. : 166671.
This paper reports the fabrication of a CuO/CdS heterostructure and the characterization of its properties for optical sensing. Cadmium sulfide (CdS) and cupric oxide (CuO) films were deposited by spray pyrolysis and hydrothermal techniques in order to fabricate CuO/CdS heterojunction devices. The structural, morphological, and optical properties of the CuO and CdS thin films were analyzed using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and UV–vis spectroscopy. The concentration of the sulfur precursor, thiourea, was varied over a range from 0.01 to 0.06 M in the spray coating solution for CdS films, and 0.05 M was found to yield improved structural and optical properties. The prepared p-CuO/n-CdS heterojunction exhibited good optical sensing properties with excellent response and recovery speeds. A possible photosensing mechanism for the fabricated heterostructure is detailed using energy band diagrams. In addition, heterojunction properties, including the ideality factor and conduction mechanism are reported: a fabricated heterostructure diode showed a threshold voltage of 0.036 V and an ideality factor of 1.86.
A. Kathalingam; K. Kesavan; V. Mary Pradeepa; Hyun-Seok Kim. Fabrication and characterization of CuO/CdS heterostructure for optoelectronic applications. Journal of Sol-Gel Science and Technology 2020, 96, 178 -187.
AMA StyleA. Kathalingam, K. Kesavan, V. Mary Pradeepa, Hyun-Seok Kim. Fabrication and characterization of CuO/CdS heterostructure for optoelectronic applications. Journal of Sol-Gel Science and Technology. 2020; 96 (1):178-187.
Chicago/Turabian StyleA. Kathalingam; K. Kesavan; V. Mary Pradeepa; Hyun-Seok Kim. 2020. "Fabrication and characterization of CuO/CdS heterostructure for optoelectronic applications." Journal of Sol-Gel Science and Technology 96, no. 1: 178-187.
Simple nebulizer spray technique used pristine and rare earth praseodymium (Pr) doped PbS thin films coated on soda-lime glass and their optoelectronic properties are reported. Dopant concentration-dependent structural, morphological, optical, and electrical properties of the prepared films were analyzed using X-ray diffraction, Raman spectrum, scanning electron microscopy, EDAX, UV–visible spectrum. X-ray diffraction study revealed the growth of polycrystalline face-centered cubic PbS thin films without any impurities. Increase of doping concentration resulted in a decrease in peak intensity indicating the degradation of crystalline quality. The Raman peaks observed at 190, 240 and 464 nm justified the formation of PbS phase. Surface morphology of the films showed dopant concentration dependent compact and uniform distribution of grains on substrate. EDAX studies legitimized the existence of Pb, S, and Pr in the prepared films. Energy band gap values of the films were gradually increased from 2.18 to 2.69 eV for the increase of doping concentration from 0 to 5 wt%. The prepared films exhibited increased currents for the increase of doping concentration with reasonable photosensing effect in I–V measurements.
K. Paulraj; S. Ramaswamy; I. S. Yahia; A. M. AlShehri; Hamoud Somaily; Hyun-Seok Kim; A. Kathalingam. Praseodymium doped PbS thin films for optoelectronic applications prepared by nebulizer spray pyrolysis. Applied Physics A Solids and Surfaces 2020, 126, 1 -10.
AMA StyleK. Paulraj, S. Ramaswamy, I. S. Yahia, A. M. AlShehri, Hamoud Somaily, Hyun-Seok Kim, A. Kathalingam. Praseodymium doped PbS thin films for optoelectronic applications prepared by nebulizer spray pyrolysis. Applied Physics A Solids and Surfaces. 2020; 126 (7):1-10.
Chicago/Turabian StyleK. Paulraj; S. Ramaswamy; I. S. Yahia; A. M. AlShehri; Hamoud Somaily; Hyun-Seok Kim; A. Kathalingam. 2020. "Praseodymium doped PbS thin films for optoelectronic applications prepared by nebulizer spray pyrolysis." Applied Physics A Solids and Surfaces 126, no. 7: 1-10.
This work demonstrates a novel attempt to enhance the optical properties of fluorine doped tin oxide (FTO) by doping rare earth element yttrium (Y) in different concentrations (0–1.5 wt.%) using nebulizer spray pyrolysis technique at 450 °C. The variation in structural, morphological, optical and electrical properties of the films due to doping are analyzed using X-ray diffraction (XRD), Raman spectroscopy, Atomic force microscope (AFM), Energy dispersive X-ray analysis (EDAX), UV–vis spectroscopy, Photoluminescence and Hall Effect measurements. The prepared films are in polycrystalline nature with tetragonal structure and its crystallite size is reduced with doping. Raman analysis shows peaks at 444 cm−1, 570 cm-1 and 790 cm-1 corresponding to Eg, Eu and B2g vibrational modes for the Y-doped FTO films. AFM measurements displays decrease in surface roughness for the doped films. Optical transmittance spectrum exhibits an increase of transmittance from 60 % to 77 % for the host material to 1.5 wt.% Y doped FTO with increase of band gap from 3.88 eV to 3.96 eV. The different optical constants such as refractive index, extinction coefficient, real and imaginary parts of dielectric constants are also reported. Ultraviolet emission at 370 nm is observed in PL spectra related to near band edge emission. Large carrier concentration 6.02 × 1019 cm-3 and small resistivity value 1.97 × 10-3 Ω-cm are observed for 1.5 wt.% Y doped FTO thin film. The obtained figure of merit value 1.9 × 10-3 Ω-1 is perfectly suitable for optoelectronic applications.
R. Thomas; T. Mathavan; Mohd. Shkir; S. AlFaify; Hyun-Seok Kim; A. Kathalingam. Influence of yttrium doping on microstructural and optical properties of FTO thin films prepared by nebulizer spray technique. Materials Today Communications 2020, 24, 101087 .
AMA StyleR. Thomas, T. Mathavan, Mohd. Shkir, S. AlFaify, Hyun-Seok Kim, A. Kathalingam. Influence of yttrium doping on microstructural and optical properties of FTO thin films prepared by nebulizer spray technique. Materials Today Communications. 2020; 24 ():101087.
Chicago/Turabian StyleR. Thomas; T. Mathavan; Mohd. Shkir; S. AlFaify; Hyun-Seok Kim; A. Kathalingam. 2020. "Influence of yttrium doping on microstructural and optical properties of FTO thin films prepared by nebulizer spray technique." Materials Today Communications 24, no. : 101087.
We report the structural characterization and nanomechanical properties of platinum (Pt) thin films prepared through facile electrochemical synthesis. The Pt thin films were coated onto indium tin oxide (ITO)/glass substrates by two-electrode electrochemical deposition at room temperature. They were characterized using X-ray diffraction, scanning electron microscopy, and atomic force microscopy for structural and morphological analyses. Indentation depth-dependent hardness and elastic modulus of the prepared films were analyzed using the nanoindentation technique. Furthermore, the mechanical properties of the ITO/glass substrates were also investigated to understand the influence of the substrate on the film properties. The prepared films showed reasonable mechanical and structural properties suitable for device applications. Finally, the photoconductivity effect of the prepared Pt film was also studied to determine its suitability for device applications. The Pt film was also coated on Cu plates to check substrates effects on this electrochemical deposition, and found that the Cu plates produced well adherent smooth films.
A. Kathalingam; Karuppasamy Pandian Marimuthu; K. Karuppasamy; Yeon-Sik Chae; Hyungyil Lee; Hyun-Chang Park; Hyun-Seok Kim. Structural and Mechanical Characterization of Platinum Thin Films Prepared Electrochemically on ITO/Glass Substrate. Metals and Materials International 2019, 27, 1554 -1564.
AMA StyleA. Kathalingam, Karuppasamy Pandian Marimuthu, K. Karuppasamy, Yeon-Sik Chae, Hyungyil Lee, Hyun-Chang Park, Hyun-Seok Kim. Structural and Mechanical Characterization of Platinum Thin Films Prepared Electrochemically on ITO/Glass Substrate. Metals and Materials International. 2019; 27 (6):1554-1564.
Chicago/Turabian StyleA. Kathalingam; Karuppasamy Pandian Marimuthu; K. Karuppasamy; Yeon-Sik Chae; Hyungyil Lee; Hyun-Chang Park; Hyun-Seok Kim. 2019. "Structural and Mechanical Characterization of Platinum Thin Films Prepared Electrochemically on ITO/Glass Substrate." Metals and Materials International 27, no. 6: 1554-1564.
Nebulizer assisted spray technique has been implemented for the deposition of pure and gadolinium (Gd) doped PbS thin films at a substrate temperature of 210 °C onto glass substrate using lead nitrate and gadolinium (III) acetate as precursors. Doping percentage of Gd was varied from 0 to 5 wt% for the preparation of Gd doped films and to analyze the film property. A variety of techniques like X-ray diffraction, Raman spectrum, scanning electron microscopy, atomic force microscopy, energy dispersive X- ray, UV–Visible spectrometer, and keithley source meter were used to study the influence of Gd doping in PbS thin films X-ray diffraction revealed no change in preferential orientation of the crystal planes without any secondary phases formed for all the Gd-doped films. And also it confirmed that the nature of the films were polycrystalline with simple cubic structure. It also further confirmed polycrystalline simple cubic structure with decrease of crystallite size from 21 nm to 16 nm for the increase of gadolinium doping concentration from 0 to 5 wt%. Noticeable change in the grain size was observed for the 5 wt% of gadolinium doping with uniformly distributed spherical shaped nanosize grains fully covering the entire surface. The compositional analysis confirmed the presence of Pb, S and Gd in the films. The optical parameters of Gd doped PbS thin films such as band gap energy, refractive index; extinction co-efficient, and real and imaginary parts of dielectric constant were determined using transmission, absorption and reflectance spectra in the range of 300–2400 nm. A maximum value of photo current was observed for 5 wt% gadolinium doped film.
K. Paulraj; S. Ramaswamy; A. M. S. Arulanantham; S. Valanarasu; Mohd Shkir; V. Ganesh; S. AlFaify; Hyun-Seok Kim; A. Kathalingam. Investigation on nebulizer spray deposited Gd-doped PbS thin films for photo sensing applications. Journal of Materials Science: Materials in Electronics 2019, 30, 18858 -18865.
AMA StyleK. Paulraj, S. Ramaswamy, A. M. S. Arulanantham, S. Valanarasu, Mohd Shkir, V. Ganesh, S. AlFaify, Hyun-Seok Kim, A. Kathalingam. Investigation on nebulizer spray deposited Gd-doped PbS thin films for photo sensing applications. Journal of Materials Science: Materials in Electronics. 2019; 30 (20):18858-18865.
Chicago/Turabian StyleK. Paulraj; S. Ramaswamy; A. M. S. Arulanantham; S. Valanarasu; Mohd Shkir; V. Ganesh; S. AlFaify; Hyun-Seok Kim; A. Kathalingam. 2019. "Investigation on nebulizer spray deposited Gd-doped PbS thin films for photo sensing applications." Journal of Materials Science: Materials in Electronics 30, no. 20: 18858-18865.
MnO2/[email protected] hybrid nanocomposite was synthesized by the hydrothermal route using ammonia and urea as catalysts. The structural, morphological and compositional properties of the hybrid composites were analyzed using XRD, SEM, HR-TEM SEM-EDAX, XPS, FTIR, and Raman measurements. The electrochemical properties of the prepared hybrid composite were studied by cyclic voltammetry analysis. The outcome of the electrochemical studies revealed a specific capacitance of ~543 Fg−1 at 0.5 A g−1 current density in the KOH (6 M) electrolyte, with a stability of ~88% up to 5000 cycles. The obtained results clearly demonstrated the significance of the nanostructured MnO2/[email protected] hybrid composite in supercapacitor applications. Hydrothermal prepared well-defined nanocrystalline [email protected]/N-doped multiwalled carbon nanotubes (N-MWCNTs) composite was successfully employed in supercapacitor application.
A. Kathalingam; Sivalingam Ramesh; Arumugam Sivasamy; Heung-Soo Kim; Hyun-Seok Kim. Supercapacitor performance of MnO2/[email protected] hybrid nanocomposite electrodes. Journal of Sol-Gel Science and Technology 2019, 91, 154 -164.
AMA StyleA. Kathalingam, Sivalingam Ramesh, Arumugam Sivasamy, Heung-Soo Kim, Hyun-Seok Kim. Supercapacitor performance of MnO2/[email protected] hybrid nanocomposite electrodes. Journal of Sol-Gel Science and Technology. 2019; 91 (1):154-164.
Chicago/Turabian StyleA. Kathalingam; Sivalingam Ramesh; Arumugam Sivasamy; Heung-Soo Kim; Hyun-Seok Kim. 2019. "Supercapacitor performance of MnO2/[email protected] hybrid nanocomposite electrodes." Journal of Sol-Gel Science and Technology 91, no. 1: 154-164.
Nanosheet-like structures of copper cobaltite (CuO/Co2O4) decorated on N-MWCNT electrodes were synthesized through hydrothermal process in the presence of ammonia/urea. The structural and morphological properties were characterized by Raman, XRD, XPS, SEM, SEM-EDX and FE-TEM analysis. The electrochemical properties of the CuO/[email protected] hybrid electrodes were studied using cyclic voltammetry, galvanostatic charge−discharge, and electrochemical impedance analyses. The prepared CuO/[email protected] and [email protected] electrodes showed a specific capacitance of ∼246 F g−1 and 100 F g−1 at a current density of 0.5 A g−1 for three electrode assembly. Further, the asymmetric cells also fabricated and it delivered the highest specific capacitance of 268 F g−1 and 279 F g−1 for [email protected] and CuO/[email protected] electrodes respectively. These electrodes possessed very good capacitance behavior with 89% retention even after 5000 cycles at 0.5 A g−1 which overlay a way to use as promising candidates for the high-performance supercapacitors.
Sivalingam Ramesh; A. Kathalingam; K. Karuppasamy; Hyun-Seok Kim; Heung Soo Kim. Nanostructured CuO/[email protected] nitrogen doped MWCNT hybrid composite electrode for high-performance supercapacitors. Composites Part B: Engineering 2018, 166, 74 -85.
AMA StyleSivalingam Ramesh, A. Kathalingam, K. Karuppasamy, Hyun-Seok Kim, Heung Soo Kim. Nanostructured CuO/[email protected] nitrogen doped MWCNT hybrid composite electrode for high-performance supercapacitors. Composites Part B: Engineering. 2018; 166 ():74-85.
Chicago/Turabian StyleSivalingam Ramesh; A. Kathalingam; K. Karuppasamy; Hyun-Seok Kim; Heung Soo Kim. 2018. "Nanostructured CuO/[email protected] nitrogen doped MWCNT hybrid composite electrode for high-performance supercapacitors." Composites Part B: Engineering 166, no. : 74-85.
Olivine-type LiNiPO4 and their corresponding Nd3+ doped LiNiPO4 cathode materials were synthesized through polyol process with 1, 2 propane-diol as the medium. The inclusion of Nd3+ to LiNiPO4 significantly enhanced the electronic conductivity by two orders as compared to bare LiNiPO4. The cyclic voltammograms revealed that the rare earth doped LiNiPO4 electrode improved the electrochemical properties. The single cell consisting of 0.07 mol% Nd3+ doped samples showed the highest specific capacity of 95.2 mAh g-1 at low current rate, which makes Nd3+ doped LiNiPO4 a prime candidate for high potential lithium-ion batteries (LIBs).
S. Karthickprabhu; Dhanasekaran Vikraman; A. Kathalingam; K. Prasanna; Hyun-Seok Kim; K. Karuppasamy. Electrochemical and cycling performance of neodymium (Nd3+) doped LiNiPO4 cathode materials for high voltage lithium-ion batteries. Materials Letters 2018, 237, 224 -227.
AMA StyleS. Karthickprabhu, Dhanasekaran Vikraman, A. Kathalingam, K. Prasanna, Hyun-Seok Kim, K. Karuppasamy. Electrochemical and cycling performance of neodymium (Nd3+) doped LiNiPO4 cathode materials for high voltage lithium-ion batteries. Materials Letters. 2018; 237 ():224-227.
Chicago/Turabian StyleS. Karthickprabhu; Dhanasekaran Vikraman; A. Kathalingam; K. Prasanna; Hyun-Seok Kim; K. Karuppasamy. 2018. "Electrochemical and cycling performance of neodymium (Nd3+) doped LiNiPO4 cathode materials for high voltage lithium-ion batteries." Materials Letters 237, no. : 224-227.
High quality Cadmium oxide thin films doped with Praseodymium (Pr) were prepared using perfume atomizer based spray pyrolysis technique at substrate temperature near 350 °C. Structural analysis of films was examined by XRD and confirmed that the films are cubic in structure. All un-doped and doped films were good crystalline in nature with smooth and flat surface without significant modifications owed to doping. Optical transmittances of doped films was decreases in the visible and IR range with increasing Pr doping concentration. Band gap widened from 2.42 to 2.20 eV when doped with Pr from 0 to 5 at. %. In addition, the photoluminescence property of the films was also observed. Further, the electrical studies were performed on pure and doped samples Viz., The electrical resistivity, carrier concentration (ρ) and Hall mobility (μ). It confirmed that the deposited films has showing good structural environments in terms of grain size, absolute stress correspond and low resistivity. Current-voltage measurements on the nanostructured Al/Pr-nCdO/p-Si/Al device showed a non-linear electric characteristics indicating diode like behavior.
M. Ravikumar; R. Chandramohan; K. Deva Arun Kumar; S. Valanarasu; A. Kathalingam; V. Ganesh; Mohd. Shkir; S. AlFaify; H. Algarni. Effect of Pr 3+ doping on key properties of CdO thin films deposited by spray pyrolysis using perfume atomizer. Journal of Physics and Chemistry of Solids 2018, 118, 211 -220.
AMA StyleM. Ravikumar, R. Chandramohan, K. Deva Arun Kumar, S. Valanarasu, A. Kathalingam, V. Ganesh, Mohd. Shkir, S. AlFaify, H. Algarni. Effect of Pr 3+ doping on key properties of CdO thin films deposited by spray pyrolysis using perfume atomizer. Journal of Physics and Chemistry of Solids. 2018; 118 ():211-220.
Chicago/Turabian StyleM. Ravikumar; R. Chandramohan; K. Deva Arun Kumar; S. Valanarasu; A. Kathalingam; V. Ganesh; Mohd. Shkir; S. AlFaify; H. Algarni. 2018. "Effect of Pr 3+ doping on key properties of CdO thin films deposited by spray pyrolysis using perfume atomizer." Journal of Physics and Chemistry of Solids 118, no. : 211-220.
A cost-effective solution-based synthesis route to grow MoSe2 thin films with vertically aligned atomic layers, thereby maximally exposing the edge sites on the film surface as well as enhancing charge transport to the electrode, is demonstrated for hydrogen evolution reaction. The surface morphologies of thin films are investigated by scanning electron microscopy and atomic force microscopy, and transmission electron microscopy analyses confirm the formation of the vertically aligned layered structure of MoSe2 in those films, with supporting evidences obtained by Raman. Additionally, their optical and compositional properties are investigated by photoluminescence and X-ray photoelectron spectroscopy, and their electrical properties are evaluated using bottom-gate field-effect transistors. The resultant pristine MoSe2 thin film exhibited low overpotential of 88 mV (at 10 mA·cm-2) and a noticeably high exchange current density of 0.845 mA·cm-2 with excellent stability, which is superior to most of other reported MoS2 or MoSe2-based catalysts, even without any other strategies such as doping, phase transformation, and integration with other materials.
Dhanasekaran Vikraman; Sajjad Hussain; Kamran Akbar; Kathalingam Adaikalam; Seung Hu Lee; Seung-Hyun Chun; Jongwan Jung; Hyun-Seok Kim; Hui Joon Park. Facile Synthesis of Molybdenum Diselenide Layers for High-Performance Hydrogen Evolution Electrocatalysts. ACS Omega 2018, 3, 5799 -5807.
AMA StyleDhanasekaran Vikraman, Sajjad Hussain, Kamran Akbar, Kathalingam Adaikalam, Seung Hu Lee, Seung-Hyun Chun, Jongwan Jung, Hyun-Seok Kim, Hui Joon Park. Facile Synthesis of Molybdenum Diselenide Layers for High-Performance Hydrogen Evolution Electrocatalysts. ACS Omega. 2018; 3 (5):5799-5807.
Chicago/Turabian StyleDhanasekaran Vikraman; Sajjad Hussain; Kamran Akbar; Kathalingam Adaikalam; Seung Hu Lee; Seung-Hyun Chun; Jongwan Jung; Hyun-Seok Kim; Hui Joon Park. 2018. "Facile Synthesis of Molybdenum Diselenide Layers for High-Performance Hydrogen Evolution Electrocatalysts." ACS Omega 3, no. 5: 5799-5807.
Tin-doped cadmium oxide (Sn:CdO) transparent thin films with different Sn concentrations were deposited on glass and p-silicon substrates by the chemical spray method at 250 °C. Different concentrations of stannic chloride were used to prepare Sn:CdO thin films. The prepared doped and un-doped CdO films were subjected to X-ray diffraction (XRD), scanning electron microscopy and atomic force microscopy, optical absorption, and electrical analyses to characterize their structural, morphological, optical, and electrical properties, respectively. XRD analysis demonstrated the growth of polycrystalline and cubic CdO with preferential orientation along the (111) plane. Sn-doping shifted the XRD peaks slightly towards a higher Bragg angle and increased the band gap of CdO thin films. Variation in doping concentration also affected the morphology of the films. Optimum Sn-doping increased the electrical conductivity of CdO thin films. Furthermore, to the best of our knowledge, the photoresponse analyses of the fabricated un-doped and doped n-CdO/p-Si heterostructures were performed for the first time in this study.
A. Kathalingam; K. Kesavan; Abu Ul Hassan Sarwar Rana; Joonhyeon Jeon; Hyun-Seok Kim. Analysis of Sn Concentration Effect on Morphological, Optical, Electrical and Photonic Properties of Spray-Coated Sn-Doped CdO Thin Films. Coatings 2018, 8, 167 .
AMA StyleA. Kathalingam, K. Kesavan, Abu Ul Hassan Sarwar Rana, Joonhyeon Jeon, Hyun-Seok Kim. Analysis of Sn Concentration Effect on Morphological, Optical, Electrical and Photonic Properties of Spray-Coated Sn-Doped CdO Thin Films. Coatings. 2018; 8 (5):167.
Chicago/Turabian StyleA. Kathalingam; K. Kesavan; Abu Ul Hassan Sarwar Rana; Joonhyeon Jeon; Hyun-Seok Kim. 2018. "Analysis of Sn Concentration Effect on Morphological, Optical, Electrical and Photonic Properties of Spray-Coated Sn-Doped CdO Thin Films." Coatings 8, no. 5: 167.
Herein, we demonstrate a facile methodology to synthesis a novel methacrylic phosphonic acid (PA)-functionalized polyhedral oligomeric silsesquioxanes (POSSs) via thiol-ene click reaction using octamercapto thiol-POSS and ethylene glycol methacrylate phosphate (EGMP) monomer. The presence of phosphonic acid moieties and POSS-cage structure in POSS-S-PA was confirmed by Fourier transform infrared (FT-IR) and nuclear magnetic resonance (1H, 29Si and 31P-NMR) analyses. Matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrum of POSS-S-PA acquired in a dithranol matrix, which has specifically designed for intractable polymeric materials. The observed characterization results signposted that novel organo-inorganic hybrid POSS-S-PA would be an efficacious material for fuel cells as a proton exchange membrane and high-temperature applications due to its thermal stability of 380 °C.
K. Karuppasamy; K. Prasanna; Dhanasekaran Vikraman; Hyun-Seok Kim; A. Kathalingam; Liviu Mitu; Hee Woo Rhee. A Rapid One-Pot Synthesis of Novel High-Purity Methacrylic Phosphonic Acid (PA)-Based Polyhedral Oligomeric Silsesquioxane (POSS) Frameworks via Thiol-Ene Click Reaction. Polymers 2017, 9, 192 .
AMA StyleK. Karuppasamy, K. Prasanna, Dhanasekaran Vikraman, Hyun-Seok Kim, A. Kathalingam, Liviu Mitu, Hee Woo Rhee. A Rapid One-Pot Synthesis of Novel High-Purity Methacrylic Phosphonic Acid (PA)-Based Polyhedral Oligomeric Silsesquioxane (POSS) Frameworks via Thiol-Ene Click Reaction. Polymers. 2017; 9 (12):192.
Chicago/Turabian StyleK. Karuppasamy; K. Prasanna; Dhanasekaran Vikraman; Hyun-Seok Kim; A. Kathalingam; Liviu Mitu; Hee Woo Rhee. 2017. "A Rapid One-Pot Synthesis of Novel High-Purity Methacrylic Phosphonic Acid (PA)-Based Polyhedral Oligomeric Silsesquioxane (POSS) Frameworks via Thiol-Ene Click Reaction." Polymers 9, no. 12: 192.
K. Kesavan; A. Kathalingam; Hyun-Seok Kim; A.R. Umayal Sundari. Effects of fluorine doping on structural, optical and electrical properties of spray deposited CdO thin films. Superlattices and Microstructures 2016, 100, 76 -88.
AMA StyleK. Kesavan, A. Kathalingam, Hyun-Seok Kim, A.R. Umayal Sundari. Effects of fluorine doping on structural, optical and electrical properties of spray deposited CdO thin films. Superlattices and Microstructures. 2016; 100 ():76-88.
Chicago/Turabian StyleK. Kesavan; A. Kathalingam; Hyun-Seok Kim; A.R. Umayal Sundari. 2016. "Effects of fluorine doping on structural, optical and electrical properties of spray deposited CdO thin films." Superlattices and Microstructures 100, no. : 76-88.
This work reports fabrication of bistable memory switching devices employing wet-chemically synthesized ZnO nanoparticles with polymethyl methacrylate and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] polymers. ZnO nanoparticle-embedded polymer layers were coated on conducting indium tin oxide (ITO) glasses using the spin-coating technique. Synthesized ZnO nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy, x-ray diffraction, energy-dispersive x-ray, and photoluminescence studies. These ZnO particles are 20 nm to 30 nm in size with hexagonal structure. Switching and memory effects of the devices fabricated employing the ZnO nanoparticle–polymer composite films were investigated using current–voltage (I–V) characteristics. The I–V measurements of both polymer devices showed electrical bistability. The ON to OFF current ratio of the bistable device was found to be ∼103. The observed current–time response showed good memory retention behavior of the fabricated devices. The carrier transport mechanism of the devices has been described on the basis of I–V experimental results and electronic structure.
A. Kathalingam; Jin-Koo Rhee; Kathalingam Adaikalam. Fabrication of Bistable Switching Memory Devices Utilizing Polymer–ZnO Nanocomposites. Journal of Electronic Materials 2012, 41, 2162 -2168.
AMA StyleA. Kathalingam, Jin-Koo Rhee, Kathalingam Adaikalam. Fabrication of Bistable Switching Memory Devices Utilizing Polymer–ZnO Nanocomposites. Journal of Electronic Materials. 2012; 41 (8):2162-2168.
Chicago/Turabian StyleA. Kathalingam; Jin-Koo Rhee; Kathalingam Adaikalam. 2012. "Fabrication of Bistable Switching Memory Devices Utilizing Polymer–ZnO Nanocomposites." Journal of Electronic Materials 41, no. 8: 2162-2168.