<abstract xmlns="http://www.w3.org/1999/xhtml">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>

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.

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

Department of Physics, Sanjeevan Engineering and Technology Institute

Department of Physics, New Arts, Commerce and Science College

Department of Physics, Ashokrao Mane Group of Institution

Department of Chemistry, Jaysingpur College

Centre for Materials for Electronics Technology (C-MET)

Centre for Interdisciplinary Research, D.Y. Patil Education Society

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Influence of bath temperature on microstructure and NH sensing properties of chemically synthesized CdO thin films

Cadmium oxide (CdO) thin films were synthesized using chemical bath deposition (CBD) method from aqueous cadmium nitrate solution. The bath temperatures were...

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

Publicado en línea: 06 mar 2019

Páginas: 25 - 32

Recibido: 29 mar 2017

Aceptado: 19 dic 2018

DOI: https://doi.org/10.2478/msp-2019-0002

Palabras clave
CdO thin films, chemical bath deposition, X-ray diffraction, scanning electron microscopy, optical properties, EDAX, gas sensing

© 2019 A.K. Sharma et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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

Publicado en línea: 06 mar 2019

Páginas: 25 - 32

Recibido: 29 mar 2017

Aceptado: 19 dic 2018

DOI: https://doi.org/10.2478/msp-2019-0002

Palabras claveCdO thin films, chemical bath deposition, X-ray diffraction, scanning electron microscopy, optical properties, EDAX, gas sensing

© 2019 A.K. Sharma et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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

Palabras clave
CdO thin films, chemical bath deposition, X-ray diffraction, scanning electron microscopy, optical properties, EDAX, gas sensing