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

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

doi:10.2478/msp-2019-0002

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.

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

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