Characteristics of a Metal-loaded SnO2/WO3 Thick Film Gas Sensor for Detecting Acetaldehyde Gas

被引：23

作者：

Jun, Jae-Mok ^{[1
]}

Park, Young-Ho ^{[2
]}

Lee, Chang-Seop ^{[1
]}

机构：

[1] Keimyung Univ, Dept Chem, Taegu 704701, South Korea

[2] Int Univ Korea, Dept Pharmaceut Engn, Gyeongnam 660759, South Korea

来源：

BULLETIN OF THE KOREAN CHEMICAL SOCIETY | 2011年 / 32卷 / 06期

关键词：

WO3 gas sensor; Sol-gel; VOCs; Acetaldehyde; Thick film; Screen-printing; TUNGSTEN; WO3; PD; CATALYST; HYDROGEN;

D O I：

10.5012/bkcs.2011.32.6.1865

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

This study investigates the sensitivity of a gas sensor to volatile organic compounds (VOCs) at various operating temperatures and catalysts. Nano-sized powdered WO3 prepared by sol-gel and chemical precipitation methods was mixed with various metal oxides. Next, transition metals (Pt, Ru, Pd, and In) were doped on the surface of the mixture. Metal-WO3 thick films were prepared using the screen-printing method. The physical and chemical properties of the films were studied by SEM/EDS, XRD, and BET techniques. The measured sensitivity to VOCs is defined as the ratio (R-a/R-g) of resistance (R-air) of WO3 film in the air to resistance (R-gas) of WO3 film in a VOCs test gas. The sensitivity and selectivity of the films were tested with various VOCs such as acetaldehyde, formaldehyde, methyl alcohol, and BTEX. The thick WO3 film containing 1 wt % of Ru and 5 wt % of SnO2 showed the best sensitivity and selectivity to acetaldehyde gas at an operating temperature of 300 degrees C.

引用

页码：1865 / 1872

页数：8

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