title: Superior selectivity and enhanced response characteristics of palladium sensitized vanadium pentoxide nanorods for detection of nitrogen dioxide gas.
abstract: Vanadium pentoxide (V2O5) nanorods have been deposited onto the glass substrates by spraying 75ml of 30mM vanadium trichloride (VCl3) solution at optimized substrate temperature of 400°C. The XRD study confirms the formation of orthorhombic crystal structure of V2O5nanorods. The FE-SEM micrograph shows the nanorods-like morphology of V2O5. The presence of palladium (Pd) in the Pd-sensitized V2O5nanorods is confirmed using EDAX study. The gas sensing measurements show that the Pd-sensitized V2O5sensing material is an outstanding candidate for nitrogen dioxide (NO2) gas detection. Obtained results demonstrate that the Pd-sensitized V2O5nanorods show the superior selectivity for NO2gas in comparison with other gases such as NH3, H2S, CO, CO2and SO2at an operating temperature of 200°C. It shows the 75% response for 100ppm NO2gas concentration with response and recovery times of 22s and 126s, respectively. Finally, the gas sensing mechanism based on chemisorption process is proposed to illustrate how Pd nanoparticles affect the gas sensing characteristics (response and response-recovery times).
authors.affiliation: Thin Film Nanomaterials Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, India; General Science and Humanities Department, Sant Gajanan Maharaj College of Engineering, Mahagaon 416 503, India.
authors.forename: A A
authors.initials: AA
authors.lastname: Mane
authors.affiliation: Optoelectronics Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, Gwangju 500-757, South Korea.
authors.forename: M P
authors.initials: MP
authors.lastname: Suryawanshi
authors.affiliation: Optoelectronics Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, Gwangju 500-757, South Korea.
authors.forename: J H
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Thin Film Nanomaterials Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, India. Electronic address: avmoholkar@gmail.com.
authors.forename: A V
authors.initials: AV
authors.lastname: Moholkar
keywords: NO(2) gas sensor; Pd-sensitization; V(2)O(5) nanorods