Abstract
High quality nanocrystalline CdO thin films have prepared by versatile spray pyrolysis deposition (SPD) method. The CdO film sensor has shown highest gas response at room temperature with good selectivity for liquefied petroleum gas (LPG). The spherical nanoparticle (7–8 nm) like morphology of CdO has been revealed using field emission scanning electron microscope (FE-SEM) as well as atomic force microscopy (AFM). Structural properties and elemental compositions have analysed by performing x-ray diffraction (XRD) and energy dispersive spectrometer (EDS) respectively. The detail investigation of structural parameters has been carried out. The optical energy bandgap for CdO has estimated to be ∼2.3 eV by using UV-vis spectroscopy and Tauc's plot. The lowest LPG response of 4.6% has observed at 1 vol%, whereas 20% response noted for 10 vol% at room temperature. The rapid response and recovery times of CdO sensor for LPG sensing have recorded to be 18 s and 32 s respectively. The LPG responses as function of operating temperature and gas concentration have studied along with sensor stability.
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