Preparation and characterization of Pt loaded WO3 films suitable for gas sensing applications

被引:31
作者
Bose, R. Jolly [1 ,2 ]
Illyasukutty, Navas [1 ,3 ]
Tan, K. S. [4 ]
Rawat, R. S. [4 ]
Matham, Murukesan Vadakke [5 ]
Kohler, Heinz [3 ]
Pillai, V. P. Mahadevan [1 ]
机构
[1] Univ Kerala, Dept Optoelect, Thiruvananthapuram 695581, Kerala, India
[2] Govt Coll Kariavattom, Dept Phys, Thiruvananthapuram 695581, Kerala, India
[3] Karlsruhe Univ Appl Sci, ISIS, Moltkestr 30, D-76133 Karlsruhe, Germany
[4] Nanyang Technol Univ, Natl Inst Educ, Nat Sci & Sci Educ, Singapore 637616, Singapore
[5] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Div Mfg Engn, Singapore 637616, Singapore
关键词
Nanoporous WO3 films; Gas sensing response; Carbon monoxide sensing; Effect of platinum loading; SOL-GEL METHOD; THIN-FILMS; TUNGSTEN-OXIDE; CARBON-MONOXIDE; SENSOR; SNO2; TEMPERATURE; SURFACE; SENSITIVITY; IRRADIATION;
D O I
10.1016/j.apsusc.2018.01.098
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This paper presents the preparation of nanostructured platinum (Pt) loaded tungsten oxide (WO3) thin films by radio frequency (RF) magnetron sputtering technique. Even though, Pt loading does not produce any phase change in WO3 lattice, it deteriorates the crystalline quality and induces defects on WO3 films. The Pt loading in WO3 has profound impact on structural and optical properties of the films by which the particle size, lattice strain and optical band gap energy are reduced. Nanoporous film with reduced particle size is obtained for 5 wt% Pt loaded WO3 sample which is crucial for gas sensors. Hence the sensing response of 5 wt% Pt loaded sample is tested towards carbon monoxide (CO) gas along with pure WO3 sample. The sensing response of Pt loaded sample is nearly 15 times higher than pure WO3 sample in non-humid ambience at an operating temperature 200 degrees C. This indicates the suitability of the prepared films for gas sensors. The sensing response of pure WO3 film depends on the humidity while the Pt loaded WO3 film shows stable response in both humid and non-humid ambiences. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:320 / 330
页数:11
相关论文
共 55 条
[11]  
Cullity B. D., 1978, ELEMENTS XRAY DIFFRA
[12]   ADSORPTION PROPERTIES OF PT FILMS ON W(110) [J].
DEMMIN, RA ;
SHIVAPRASAD, SM ;
MADEY, TE .
LANGMUIR, 1988, 4 (05) :1104-1108
[13]   Fabrication and characterization of electrochromic nanocrystalline WO3/Si (111) thin films for infrared emittance modulation applications [J].
Fang, GJ ;
Liu, ZL ;
Yao, KL .
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2001, 34 (15) :2260-2266
[14]   CO sensing with SnO2 thick film sensors:: role of oxygen and water vapour [J].
Hahn, SH ;
Bârsan, N ;
Weimar, U ;
Ejakov, SG ;
Visser, JH ;
Soltis, RE .
THIN SOLID FILMS, 2003, 436 (01) :17-24
[15]   OXIDATION-KINETICS OF CARBON-MONOXIDE IN SUPERCRITICAL WATER [J].
HELLING, RK ;
TESTER, JW .
ENERGY & FUELS, 1987, 1 (05) :417-423
[16]   Hydrogen sensing characteristics of an electrodeposited WO3 thin film gasochromic sensor activated by Pt catalyst [J].
Hsu, Wen-Chia ;
Chan, Chih-Chieh ;
Peng, Chia-Hsiang ;
Chang, Chung-Chieh .
THIN SOLID FILMS, 2007, 516 (2-4) :407-411
[17]   Temperature dependence of optical band gap in ferroelectric Bi3.25La0.75Ti3O12 films determined by ultraviolet transmittance measurements [J].
Hu, Z. G. ;
Li, Y. W. ;
Yue, F. Y. ;
Zhu, Z. Q. ;
Chu, J. H. .
APPLIED PHYSICS LETTERS, 2007, 91 (22)
[18]   CO sensing mechanism with WO3 based gas sensors [J].
Huebner, M. ;
Simion, C. E. ;
Haensch, A. ;
Barsan, N. ;
Weimar, U. .
SENSORS AND ACTUATORS B-CHEMICAL, 2010, 151 (01) :103-106
[19]   Hydrogen sensing characteristics of WO3 thin film conductometric sensors activated by Pt and Au catalysts [J].
Ippolito, SJ ;
Kandasamy, S ;
Kalantar-zadeh, K ;
Wlodarski, W .
SENSORS AND ACTUATORS B-CHEMICAL, 2005, 108 (1-2) :154-158
[20]   New applications of tin oxide gas sensors II. Intelligent sensor system for reliable monitoring of ammonia leakages [J].
Jerger, A ;
Kohler, H ;
Becker, F ;
Keller, HB ;
Seifert, R .
SENSORS AND ACTUATORS B-CHEMICAL, 2002, 81 (2-3) :301-307