Authors : C. R. Bobade
Page Nos : 118-125
Description :
Cadmium Oxide (CdO) thin films were deposited onto glass at low substrate temperature of 210 oC using spray CVD technique. The structural, morphological, optical and gas sensing properties of the films were investigated. X-ray diffraction (XRD) studies show that films thus prepared are polycrystalline in nature with rock salt type cubic crystal structure and are preferentially oriented along (111) plane. Scanning Electron Microscopy (SEM) micrographs revealed that the film surfaces were rough and exhibit granular morphology. From optical studies it is seen that the films were transparent in the visible region. The measured values of band gap of as deposited films found to vary from 2.42 to 2.55 eV. H2S gas sensing studies were carried out by using homemade gas sensing equipment and it was observed that a typical sample showed up to 10% sensitivity at an operating temperature of 250 oC.
