Search

Your search keyword '"Yewale, M.A."' showing total 30 results
Start Over Author "Yewale, M.A."
30 results on '"Yewale, M.A."'

28. Influence of bath temperature on microstructure and NH3 sensing properties of chemically synthesized CdO thin films.

Author

Sharma, A.K., Potdar, S.S., Yewale, M.A., Shirgaonkar, Deepak B., Pakhare, K.S., Sargar, B.M., Rokade, M.V., and Patil, U.M.

Subjects
THIN films
Abstract

Cadmium oxide (CdO) thin films were synthesized using chemical bath deposition (CBD) method from aqueous cadmium nitrate solution. The bath temperatures were maintained at room temperature (25 °C) and at higher temperature (80 °C). The structural studies revealed that the films showed mixed phases of CdO and Cd(OH)2 with hexagonal/monoclinic crystal structure. Annealing treatment removed the hydroxide phase and the films converted into pure CdO with cubic, face centered crystal structure. SEM micrographs of as-deposited films revealed nanowire-like morphology for room temperature deposited films while nanorod-like morphology for high temperature deposited films. However, cube-like morphology was observed after air annealing. Elemental composition was confirmed by EDAX analysis. Band gap energies of the as-deposited films varied over the range of 3 eV to 3.5 eV, whereas the annealed films showed band gap energy variation in the range of 2.2 eV to 2.4 eV. The annealed films were successfully investigated for NH3 sensing at different operating temperatures and at different gas concentrations. The room temperature synthesized film showed a response of 17.3 %, whereas high temperature synthesized film showed a response of 13.5 % at 623 K upon exposure to 24 ppm of NH3. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

29. Wrapped nanochain microstructures of Ni3V2O8nanoparticles for supercapacitor applications using the hydrothermal method

Author

Yewale, M.A., Kumar, V., Kadam, R.A., Kharade, R.B., Teli, A.M., Beknalkar, S.A., Dhas, S.D., Nakate, U.T., and Shin, D.K.

Abstract

With the improved microstructure, porosity, and surface area, bimetal oxides make excellent electrode materials for supercapacitor applications. Here, the hydrothermal method for different molar concentration ratios of Nickel and Vanadium sources was successfully used to synthesize the Ni3V2O8microballs with a porous microstructure. At a current density of 3 mA/cm2, the electrode prepared at a Ni:V molar ratio of 1:0.5 exhibits excellent areal capacitance of 1.56 F/cm2. The Ni3V2O8//AC device is an asymmetrical one, delivering 6.6 mWh/cm2energy density at 2.2 W/cm2power densities while exhibiting an area capacitance of 39 mF/cm2at 8 mA/cm2current density. With a retention of 72 % for the most recent 5 K GCD cycles, the device exhibits excellent stability for use in practical applications over 5 k GCD cycles at 12 mA/cm2. This research offers a Ni3V2O8microstructure that offers excellent areal capacitance for energy storage applications.

Published
2023
Full Text
View/download PDF

30. Influence of bath temperature on microstructure and NH3sensing properties of chemically synthesized CdO thin films

Author

Sharma, A.K., Potdar, S.S., Yewale, M.A., Shirgaonkar, Deepak B., Pakhare, K.S., Sargar, B.M., Rokade, M.V., and Patil, U.M.

Abstract

Cadmium oxide (CdO) thin films were synthesized using chemical bath deposition (CBD) method from aqueous cadmium nitrate solution. The bath temperatures were maintained at room temperature (25 °C) and at higher temperature (80 °C). The structural studies revealed that the films showed mixed phases of CdO and Cd(OH)2with hexagonal/monoclinic crystal structure. Annealing treatment removed the hydroxide phase and the films converted into pure CdO with cubic, face centered crystal structure. SEM micrographs of as-deposited films revealed nanowire-like morphology for room temperature deposited films while nanorod-like morphology for high temperature deposited films. However, cube-like morphology was observed after air annealing. Elemental composition was confirmed by EDAX analysis. Band gap energies of the as-deposited films varied over the range of 3 eV to 3.5 eV, whereas the annealed films showed band gap energy variation in the range of 2.2 eV to 2.4 eV. The annealed films were successfully investigated for NH3sensing at different operating temperatures and at different gas concentrations. The room temperature synthesized film showed a response of 17.3 %, whereas high temperature synthesized film showed a response of 13.5 % at 623 K upon exposure to 24 ppm of NH3.

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results