Superior selectivity and enhanced response characteristics of palladium sensitized vanadium pentoxide nanorods for detection of nitrogen dioxide gas

A A Mane; M P Suryawanshi; J H Kim; A V Moholkar

doi:10.1016/j.jcis.2017.01.120

Superior selectivity and enhanced response characteristics of palladium sensitized vanadium pentoxide nanorods for detection of nitrogen dioxide gas

J Colloid Interface Sci. 2017 Jun 1:495:53-60. doi: 10.1016/j.jcis.2017.01.120. Epub 2017 Feb 3.

Authors

A A Mane¹, M P Suryawanshi², J H Kim², A V Moholkar³

Affiliations

¹ 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.
² Optoelectronics Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, Gwangju 500-757, South Korea.
³ Thin Film Nanomaterials Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, India. Electronic address: avmoholkar@gmail.com.

PMID: 28189109
DOI: 10.1016/j.jcis.2017.01.120

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 V₂O₅ nanorods. The FE-SEM micrograph shows the nanorods-like morphology of V₂O₅. The presence of palladium (Pd) in the Pd-sensitized V₂O₅ nanorods is confirmed using EDAX study. The gas sensing measurements show that the Pd-sensitized V₂O₅ sensing material is an outstanding candidate for nitrogen dioxide (NO₂) gas detection. Obtained results demonstrate that the Pd-sensitized V₂O₅ nanorods show the superior selectivity for NO₂ gas in comparison with other gases such as NH₃, H₂S, CO, CO₂ and SO₂ at an operating temperature of 200°C. It shows the 75% response for 100ppm NO₂ gas 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).

Keywords: NO(2) gas sensor; Pd-sensitization; V(2)O(5) nanorods.

Publication types

Research Support, Non-U.S. Gov't