Effect of substrate temperature on physicochemical and gas sensing properties of sprayed orthorhombic V2O5 thin films

被引：26
作者：
Mane, A. A. [1 ,2 ]
Maldar, P. S. [1 ]
Dabhole, S. H. [3 ]
Nikam, S. A. [3 ]
Moholkar, A., V [1 ]
机构：
[1] Shivaji Univ, Dept Phys, Thin Film Nanomat Lab, Kolhapur 416004, Maharashtra, India
[2] St Gajanan Maharaj Coll Engn, Gen Sci & Humanities Dept, Mahagaon 416503, India
[3] St Gajanan Maharaj Rural Polytech, Gen Sci & Humanities Dept, Mahagaon 416503, India
来源：
MEASUREMENT | 2019年 / 131卷
关键词：
Substrate temperature; Raman spectroscopy; V2O5 thin films; Gas sensor; TRIOXIDE MOO3 NANOBELTS; LITHIUM INTERCALATION; STRUCTURAL-PROPERTIES; ENHANCED RESPONSE; VANADIUM-OXIDES; LPG DETECTION; NO2; SURFACE; SENSOR; PERFORMANCE;
D O I：
10.1016/j.measurement.2018.08.042
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The chemical spray (CSP) deposition method has been used to deposit orthorhombic V2O5 thin films onto glass substrate at different substrate temperatures. Raman spectra indicate that films are in orthorhombic V2O5 phase. The FE-SEM micrographs show the formation of nanorods-like morphology. The EDAX study shows that the films are in sub-stoichiometric proportion of V2O5. The presence of V5+ oxidation state of vanadium in V2O5 film is confirmed using XPS study. Selectivity study shows that V2O5 film is a highly promising candidate for selective detection of NO2 gas at moderate working temperature of 200 degrees C. For V2O5 film deposited at 400 degrees C, the 20.3% NO2 response for 100 ppm concentration is obtained with response and recovery times of 17 s and 185 s, respectively. The lower NO2 gas detection limit is found to be 20 ppm which is equal to immediately dangerous to life or health (IDLH) value. Finally, role of oxygen ion vacancies in NO2 gas sensing mechanism based on formation of reduced V2O5-x species is discussed. (C) 2018 Published by Elsevier Ltd.
引用
收藏
页码：223 / 234
页数：12
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