Cadmium Metavanadate Mixed Oxide Nanorods for Chemiresistive Detection of Methane Molecules
Mixed transition metal oxide (MTMO) have recently been explored as building blocks for gas sensing applications for its enhanced sensing characteristics. Here, we demonstrate the application of co-sputtered V2O5-CdO thin films as novel chemiresistive sensor for the detection of CH4 gas. From x-ray diffraction (XRD) studies the mixed phase was identified as polycrystalline cadmium metavanadate (CdV2O6) and from x-ray photoelectron spectroscopy (XPS) studies, the clear revealation of V+5 and Cd+2 corresponding to V2O5-CdO was observed. The obtained mixed phase featured fused nanorod like structure with ~450 nm thickness. By monitoring the sequential sensing characteristics at various temperature (RT-150°C) and concentration (25-500 ppm) range, the optimum operating temperature (100°C) was identified. The polycrystalline V2O5-CdO sensor exhibited the response of ~ 1.72% towards 25 ppm at 100°C. The use of evenly co-sputtered semiconductive (Cd+2 and V+5) nanorods will provide advanced routes towards the development of various devices based on MTMO.