Time filter

Source Type

Dhole I.A.,University of Solapur | Navale S.T.,Shenzhen University | Navale Y.H.,University of Solapur | Jadhav Y.M.,University of Solapur | And 3 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2017

Nanostructured nickel oxide (NiO) electrode has been prepared using electrochemical work station operated on galvanostatic mode in supercapacitor application. Crystalline cubic structure and nanoplate-type of morphology of synthesized NiO electrode was confirmed from X-ray diffraction and scanning electron microscopy analysis respectively. The wettability study was tested by contact angle measurement, which reveals hydrophilic nature of NiO electrode with contact angle of 59°. The presence of nickel and oxygen characteristic bands in EDAX and XPS spectrum has corroborated the NiO formation. The supercapacitive properties of NiO electrode were tested by cyclic voltammogram (CV) in 1 M aqueous Na2SO4, KOH, NaOH electrolytes within the potential range of − 1.1 to 0.9 V, 0 to 0.4 V and − 1.2 to 0.4 respectively. The CV study demonstrates maximum specific capacitance of 481.16 Fg− 1 for 1 M Na2SO4. The obtained specific power, specific energy and coulombic efficiency values of NiO electrode are 19.48 kW kg− 1, 60.12 Whkg− 1, and 92.31%, respectively. In the meantime it exhibited excellent cycle life time with 92.3% specific capacitance kept after 1000 cycles. These results imply that NiO electrode is promising candidate for upcoming thin film supercapacitors and other microelectronic constructions. © 2017 Springer Science+Business Media New York

Kumar S.,Changwon National University | Vats P.,Material Science Research Laboratory | Gautam S.,Korea Institute of Science and Technology | Gupta V.P.,Material Science Research Laboratory | And 4 more authors.
Materials Research Bulletin | Year: 2014

We report structural, magnetic and electronic structural properties of Ni doped ZnO nanoparticles prepared by auto-combustion method. The prepared nanoparticles were characterized by using X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), near edge X-ray absorption fine structure (NEXAFS) spectroscopy, and dc magnetization measurements. The XRD and HR-TEM results indicate that Ni doped ZnO nanoparticles have single phase nature with wurtzite lattice and exclude the presence of secondary phase. NEXAFS measurements performed at Ni L3,2-edges indicates that Ni ions are in +2 valence state and exclude the presence of Ni metal clusters. O K-edge NEXAFS spectra indicate an increase in oxygen vacancies with Ni-doping, while Zn L3,2-edge show the absence of Zn-vacancies. The magnetization measurements performed at room temperature shows that pure and Ni doped ZnO exhibits ferromagnetic behavior. © 2014 Elsevier Ltd.

Sharma A.,Material Science Research Laboratory | Singh A.P.,Inter University Accelerator Center | Thakur P.,European Synchrotron Radiation Facility | Brookes N.B.,European Synchrotron Radiation Facility | And 6 more authors.
Journal of Applied Physics | Year: 2010

We present a detailed study on the structural, electronic, and magnetic properties of chemically synthesized Sn1-x Cox O 2 (x=0.00 to 0.05) nanoparticles. X-ray diffraction and transmission electron microscope measurements were performed to analyze the crystal structure and morphology of Sn1-x Cox O2 nanoparticles. The energy dispersive x-ray analysis measurements were performed to check the possible presence of any impurity elements in the nanocrystals. The near edge x-ray absorption fine structure (NEXAFS) experiments at Sn M5,4 -edge and Co L3,2 -edge were performed to probe the local environment of Sn and Co ions in the SnO2 matrix. The NEXAFS at Co L3,2 -edge, along with multiplet calculations, indicate that the Co is substituted at the Sn site in SnO 2 matrix with +2 charge state and do not form metallic clusters and other oxide phases. The ferromagnetic nature of these materials was confirmed by x-ray magnetic circular dichroism and room temperature magnetization hysteresis loop measurements. © 2010 American Institute of Physics.

Sharma A.,Krishna Institute of Engineering and Technology | Varshney M.,Material Science Research Laboratory | Verma K.D.,Material Science Research Laboratory | Kumar Y.,Pohang Accelerator Laboratory | Kumar R.,National Institute of Technology Hamirpur
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2013

This paper gives detailed investigations on the deposition of SnO thin films, on glass substrates, using RF sputtering technique. To check the stability of SnO phase, under high energy ion irradiation, swift heavy ion (SHI) beam irradiation experiments are performed using 150 MeV Au beams. The effect of irradiation, with three irradiation fluences i.e. 1 × 1011, 1 × 1012, and 5 × 1012 ions/cm2, is investigated by X-ray diffraction (XRD), Raman spectroscopy, and Atomic force microscopy (AFM). The possible mechanism of the structural changes (tetragonal SnO (space group P4/nmm) to orthorhombic SnO (space group Cmc21)) and surface microstructure evolutions is briefly discussed in the light of ion's energy and energy loss processes. © 2013 Elsevier B.V. All rights reserved.

Prakash D.,SMVD University | Varshney M.,Material Science Research Laboratory | Verma K.D.,Material Science Research Laboratory | Kumar R.,National Institute of Technology Hamirpur
Science of Advanced Materials | Year: 2012

We report the oriented growth of single phase CeO2 thin films using pulsed laser deposition technique and their structural and optical properties. X-ray diffraction (XRD) measurements confirm the (111) oriented growth of CeO2 thin films on amorphous quartz substrates. The atomic force microscopy (AFM) measurements supported the XRD measurements and depict the formation of larger sized crystallites in annealed films. UV-visible absorption spectra show significant red-shift in the absorption edge and hence, decrease in the band gap energy has been observed in annealed CeO2 film. Raman mode intensity of F2g mode was observed to increase after heat treatment. The photoluminescence (PL) spectra show visible emission from both the samples of as-deposited and annealed CeO2 films. Copyright © 2012 by American Scientific Publishers.

Varshney M.,Material Science Research Laboratory | Sharma A.,Krishna Institute of Engineering and Technology | Verma K.D.,Material Science Research Laboratory | Kumar R.,National Institute of Technology Hamirpur
Physica Scripta | Year: 2012

In this work, we report detailed investigations on the structural and magnetic properties of pure and Co-doped CeO 2 nanoparticles. All the samples, with different cobalt concentrations, were prepared by the co-precipitation method. To investigate the structural properties and phases present in the samples, systematic, x-ray diffraction measurements were performed in the θ-2θ mode. Phonon modes, from the pure and Co-doped samples, were studied by Raman scattering measurements. Surface morphology of individual nanoparticles was studied by field emission scanning electron microscopy. Interestingly, room temperature ferromagnetism is observed in, both, un-doped and Co-doped samples. The mechanisms of variation in the Raman active mode (F 2g) and magnetization, by increasing the cobalt concentration, are briefly discussed. © 2012 The Royal Swedish Academy of Sciences.

Yadav A.T.,Material Science Research Laboratory | Magar P.P.,University of Pune | Kadam V.S.,University of Pune | Jagtap C.V.,University of Pune | Pawar C.S.,Material Science Research Laboratory
Journal of Materials Science: Materials in Electronics | Year: 2016

Nickel oxide (NiO) thin films have been synthesized by simple and inexpensive chemical bath deposition at low temperature. The synthesized thin films were annealed at 623 K and used for further characterization. Structural and morphological properties of the NiO thin film were characterized using X-ray diffraction and scanning electron microscope (SEM), respectively. The structural study shows the simple cubic formation of NiO thin films with average crystallite size of 9 nm. Honeycomb like surface morphology with porous structure was observed from the SEM study. NiO thin film electrode has been used as a counter electrode in dye sensitized solar cell. Finally, photovoltaic parameters such as short circuit current density (Jsc), open circuit voltage (Voc), Fill Factor (FF) and efficiency (η) have been studied. © 2016 Springer Science+Business Media New York

Deshmukh S.B.,Arts Science and Commerce College | Bari R.H.,Material Science Research Laboratory | Patil G.E.,Material Research Laboratory | Jain G.H.,Material Research Laboratory
Proceedings of the International Conference on Sensing Technology, ICST | Year: 2012

ZrO2 thick films were prepared by standard screen printing technique. Pure ZrO2 films were activated with Cr3+ by dipping them into an aqueous solution (0.1 M) of chromium trioxide CrO 3 for different interval of time 5, 10, 20, 30 minutes and fired at 550°C for 30 min. The CrO3 is known to be unstable above 197°C and transform into Cr2O3 upon firing above 197°C. The grain of Cr2O3 would disperse around the grains of ZrO2 base material. The films were characterized by XRD, SEM, EDAS, UV techniques. The gas sensing performance of different target gases was tested and the chromium activated films dipped in 10 Min. was observed to be sensitive. And highly selective 1000ppm of NH3 gas at operating temperature 300°C. The elemental composition were discussed and effect of Cr 3+ concentration on sensitivity, selectivity, response and recovery time of the sensor in the presence of different gases were studied. Reaction mechanism were discussed with better performance could attributed to an optimum number of surface misfrits in terms of Cr2O3 on the ZrO2 films. It was first time observed that crominated surface modified film have reduction in bandwidth and observed activation energy were reported. © 2012 IEEE.

Alavi S.J.,Ferdowsi University of Mashhad | Khalili N.,Payame Noor University | Kazemi Oskuee R.,Mashhad University of Medical Sciences | Verma K.D.,Material Science Research Laboratory | Darroudi M.,Mashhad University of Medical Sciences
Ceramics International | Year: 2015

Abstract Monodispersed zinc oxide nanoparticles (ZnO-NPs) were synthesized by a simple sol-gel method. In this process, polyethyleneimine (PEI) was used as a polymeric matrix and mild reaction conditions. The PEI acted as a stabilizing or capping agent and polymeric template for preparing ZnO-NPs. The ZnO-NPs were successfully grown at different calcination temperatures, and their crystallite structures were characterized using various methods, including TEM, PXRD, FTIR, and TGA/DTA techniques. The PXRD analysis revealed wurtzite hexagonal ZnO with preferential orientation at (101) reflection plane. Spherical ZnO-NPs were synthesized and its TEM image showed the formation of nanopowders in size of about 25 nm, while dose dependent toxicity with non-toxic effect of concentration below 6.25 μg/mL was observed in the studies of in vitro cytotoxicity on neuro2A cells. © 2015 Elsevier Ltd and Techna Group S.r.l.

Sharma A.,Material Science Research Laboratory | Varshney M.,Material Science Research Laboratory | Kumar S.,Changwon National University | Verma K.D.,Material Science Research Laboratory | Kumar R.,Indian National Institute of Engineering
Nanomaterials and Nanotechnology | Year: 2011

In this work, we report the room temperature ferromagnetism in Sn1-xFexO2 and Sn1-xNixO2 (x = 0.00, 0.03 and 0.05) nano-crystalline powders. All the samples were prepared using co-precipitation method. X-Ray Diffraction (XRD), transmission electron microscopy (TEM), energy dispersive x-ray analysis (EDAX), UVvisible absorption spectroscopy and room temperature magnetization measurements were performed to study the crystal structure, morphology, elemental analysis, optical band gap and magnetic properties of Fe and Ni doped SnO2. TEM results depict the formation of spherically shaped and small sized nanoparticles of the diameter of ̃ 3 nm. The band gap energy of the Fe and Ni doped samples found to decrease with increasing their concentrations. The higher saturation magnetization was observed in low concentration Fe and Ni doped tin oxide.

Loading Material Science Research Laboratory collaborators
Loading Material Science Research Laboratory collaborators