Abstract
The nanocrystalline V2O5 thin films with different thicknesses have been grown onto the glass substrates using chemical spray pyrolysis (CSP) deposition method. The XRD study shows that the films exhibit an orthorhombic crystal structure. The narrow scan X-ray photoelectron spectrum of V-2p core level doublet gives the binding energy difference of 7.3eV, indicating that the V5+ oxidation state of vanadium. The FE-SEM micrographs show the formation of nanorods-like morphology. The AFM micrographs show the high surface area to volume ratio of nanocrystalline V2O5 thin films. The optical study gives the band gap energy values of 2.41eV, 2.44eV, 2.47eV and 2.38eV for V2O5 thin films deposited with the thicknesses of 423nm, 559nm, 694nm and 730nm, respectively. The V2O5 film of thickness 559nm shows the NO2 gas response of 41% for 100ppm concentration at operating temperature of 200°C with response and recovery times of 20s and 150s, respectively. Further, it shows the rapid response and reproducibility towards 10ppm NO2 gas concentration at 200°C. Finally, NO2 gas sensing mechanism based on chemisorption process is discussed.
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