Chemical Vapour Deposited CdO thin film for ethanol sensing

Abstract

Herein we report the formation of cubic-phased Cadmium Oxide thin films using the aerosol-assisted chemical vapor deposition (AACVD) technique which gives high-quality, uniform thin film. The structural, morphological, and optical characterization of the deposited films was done using X-ray diffraction, SEM, TEM, UV-Vis spectroscopy, etc.The XRD analysis reports that crystallite size increases with film thickness. TEM shows particle size ~ 30 nm. SEM studies reveal an increase in surface roughness and porosity with the increase in thickness. Optical data shows band gap decreases with an increase in thickness. Semiconducting metal oxides (SMO) are broadly used in gas sensors for sensing different gases. Their sensitivity can be increased by varying the different parameters involved in the deposition process. The gas sensing ability of CdO thin film shows that increasing of number of depositions enhances the sensitivity bizarrelyfor ethanol.