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

Bulletin of the Korean chemical society

Young-Ho Park¹  Jae-Mok Jun¹  Chang-Seop Lee¹ 

关键词: WO3 gas sensor;    Sol-gel;    VOCs;    Acetaldehyde;    Thick film;    Screen-printing;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 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 (Ra/Rg) of resistance (Rair) of WO3 film in the air to resistance (Rgas) 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 oC.

【 授权许可】

Unknown