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Dr. Sanjeev Kumar Ujjain
Research Initiative for Supra-Materials (RISM), Shinshu University, Nagano 380-8553, Japan

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0 Electrochemistry
0 Gas Separation
0 Nanocomposites
0 Sensors
0 Supercapacitors

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Review
Published: 15 March 2021 in Journal of Composites Science
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Transition metal oxides (TMO) and their carbon composites have become a glittering upcoming material science candidate. Their interesting properties, such as their meticulous morphology, plentiful availability, flexible surface chemistry along with outstanding mechanical, thermal, and optical properties make them ideal for efficient photocatalytic dye degradation. An extensive range of TMO, and their carbon composites are reviewed highlighting the progression and opportunities for the photocatalytic degradation of dyes. Here, we concisely describe the numerous techniques to extend the optical absorption of these TMOs involving dye sensitization, metal doping, etc. Besides this, an overview of all aspects of dye degradation along with the prevailing challenges for future utilization and development of such nanocomposites towards highly efficient dye degradation system are also reported.

ACS Style

Preety Ahuja; Sanjeev Ujjain; Rajni Kanojia; Pankaj Attri. Transition Metal Oxides and Their Composites for Photocatalytic Dye Degradation. Journal of Composites Science 2021, 5, 82 .

AMA Style

Preety Ahuja, Sanjeev Ujjain, Rajni Kanojia, Pankaj Attri. Transition Metal Oxides and Their Composites for Photocatalytic Dye Degradation. Journal of Composites Science. 2021; 5 (3):82.

Chicago/Turabian Style

Preety Ahuja; Sanjeev Ujjain; Rajni Kanojia; Pankaj Attri. 2021. "Transition Metal Oxides and Their Composites for Photocatalytic Dye Degradation." Journal of Composites Science 5, no. 3: 82.

Journal article
Published: 24 November 2018 in Journal of Saudi Chemical Society
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We have demonstrated the covalent functionalization of graphene by nitrene chemistry, resulting in highly dispersed aryl azides functionalized graphene. Two different ortho-substituted aryl azides having different aromatic ring (π-conjugation) and ester/anhydride substituent have been synthesized. Further, on thermolysis they undergo [2+1] cycloaddition ensuing in the formation of aziridine adduct with sp2 carbons of graphene. Resulting aryl azide functionalized graphene sheets (f-graphene I & II) are soluble in most common organic (polar and non polar) solvents, facilitating the structural/property characterization and the device fabrication by solution processing. The aziridine linkage modification of the π conjugation and the strong electronic interaction between the f-graphenes and poly (3-hexylthiophene) (P3HT):Phenyl-C61-Butyric-Acid-Methyl Ester (PCBM) has been confirmed by various spectroscopic analysis. The implications of changing the aromaticity of the aryl azides attached to f-graphenes on the P3HT:PCBM bulk heterojunction (BHJ) photovoltaic device are discussed. The solution cast f-graphene I (5%) doped P3HT:PCBM BHJ showed the power conversion efficiency ɳ=1.94(±0.06) %, while f-graphene II (5%) doped exhibited ɳ=2.16(±0.07) % under AM 1.5 illumination (100 mW/cm2), which is found to be more than double the efficiency of the reference cell.

ACS Style

Sanjeev Kumar Ujjain; Rohit Bhatia; Preety Ahuja. Aziridine-functionalized graphene: Effect of aromaticity for aryl functional groups on enhanced power conversion efficiency of organic photovoltaic cells. Journal of Saudi Chemical Society 2018, 23, 655 -665.

AMA Style

Sanjeev Kumar Ujjain, Rohit Bhatia, Preety Ahuja. Aziridine-functionalized graphene: Effect of aromaticity for aryl functional groups on enhanced power conversion efficiency of organic photovoltaic cells. Journal of Saudi Chemical Society. 2018; 23 (6):655-665.

Chicago/Turabian Style

Sanjeev Kumar Ujjain; Rohit Bhatia; Preety Ahuja. 2018. "Aziridine-functionalized graphene: Effect of aromaticity for aryl functional groups on enhanced power conversion efficiency of organic photovoltaic cells." Journal of Saudi Chemical Society 23, no. 6: 655-665.

Journals
Published: 25 August 2015 in Journal of Materials Chemistry B
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A novel graphene nanoribbon (GNR)/cobalt coordination polymer (MCPs) composite ([email protected]) is prepared by in situ reduction of graphene oxide nanoribbon (GONR) with simultaneous growth of MCPs nanoparticles on its surface. The morphology and structure are investigated by high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), UV-Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), Fourier transform-infrared spectroscopy, X-ray diffraction and Raman spectroscopy. Results indicate that MCPs nanoparticles having dia. ∼6 nm are successfully deposited on GNR to form a hybrid conducting network. Analysis of the performance of the [email protected] composite shows high non-enzymatic electrocatalytic activity for H2O2 reduction with a low limit of detection ∼60 nM at S/N = 3. The fluorescence of MCPs provides an optical feature which is also applied here for the detection of H2O2. The fluorescence quenching of [email protected] can be achieved by addition of H2O2 which shows linearity over a range of increasing concentration of 10 μM to 150 μM.

ACS Style

Sanjeev K. Ujjain; Preety Ahuja; Raj Kishore Sharma. Facile preparation of graphene nanoribbon/cobalt coordination polymer nanohybrid for non-enzymatic H2O2 sensing by dual transduction: electrochemical and fluorescence. Journal of Materials Chemistry B 2015, 3, 7614 -7622.

AMA Style

Sanjeev K. Ujjain, Preety Ahuja, Raj Kishore Sharma. Facile preparation of graphene nanoribbon/cobalt coordination polymer nanohybrid for non-enzymatic H2O2 sensing by dual transduction: electrochemical and fluorescence. Journal of Materials Chemistry B. 2015; 3 (38):7614-7622.

Chicago/Turabian Style

Sanjeev K. Ujjain; Preety Ahuja; Raj Kishore Sharma. 2015. "Facile preparation of graphene nanoribbon/cobalt coordination polymer nanohybrid for non-enzymatic H2O2 sensing by dual transduction: electrochemical and fluorescence." Journal of Materials Chemistry B 3, no. 38: 7614-7622.

Research article
Published: 08 July 2015 in PLoS ONE
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We report the functionalization of multiwalled carbon nanotubes (MWCNT) via the 1,3-dipolar [3+2] cycloaddition of aromatic azides, which resulted in a detangled CNT as shown by transmission electron microscopy (TEM). Carboxylic moieties (-COOH) on aromatic azide result in highly stable aqueous dispersion (max. conc. ~ 10 mg/mL H2O), making the suitable for inkjet printing. Printed patterns on polyethylene terephthalate (PET) flexible substrate exhibit low sheet resistivity ~65 Ω. cm, which is attributed to enhanced conductivity. Fabricated Supercapacitors (SC) assembled using these printed substrates exhibit good electrochemical performance in organic as well as aqueous electrolytes. High energy and power density (57.8 Wh/kg and 0.85 kW/kg) in 1M H2SO4 aqueous electrolyte demonstrate the excellent performance of the proposed supercapacitor. Capacitive retention varies from ~85–94% with columbic efficiency ~95% after 1000 charge/discharge cycles in different electrolytes, demonstrating the excellent potential of the device for futuristic power applications.

ACS Style

Sanjeev Kumar Ujjain; Rohit Bhatia; Preety Ahuja; Pankaj Attri. Highly Conductive Aromatic Functionalized Multi-Walled Carbon Nanotube for Inkjet Printable High Performance Supercapacitor Electrodes. PLoS ONE 2015, 10, e0131475 .

AMA Style

Sanjeev Kumar Ujjain, Rohit Bhatia, Preety Ahuja, Pankaj Attri. Highly Conductive Aromatic Functionalized Multi-Walled Carbon Nanotube for Inkjet Printable High Performance Supercapacitor Electrodes. PLoS ONE. 2015; 10 (7):e0131475.

Chicago/Turabian Style

Sanjeev Kumar Ujjain; Rohit Bhatia; Preety Ahuja; Pankaj Attri. 2015. "Highly Conductive Aromatic Functionalized Multi-Walled Carbon Nanotube for Inkjet Printable High Performance Supercapacitor Electrodes." PLoS ONE 10, no. 7: e0131475.