A new highly selective H2 sensor based on TiO2/PtO-Pt dual-layer films

被引：90

作者：

Du, XY

Wang, Y ^{[1
]}

Mu, YY

Gui, LL

Wang, P

Tang, YQ

机构：

[1] Peking Univ, Coll Chem & Mol Engn, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100871, Peoples R China

[2] Beijing Inst Chem Technol, Fac Sci, Beijing 100029, Peoples R China

来源：

CHEMISTRY OF MATERIALS | 2002年 / 14卷 / 09期

关键词：

D O I：

10.1021/cm0201293

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：

A new highly selective hydrogen sensor based on TiO2/PtO-Pt dual-layer films has been prepared. At 180-200 degreesC, the prepared nanostructured sensor exhibits an excellent selectivity and good sensitivity to H-2 in air but is immune to many other kinds of reductive gases such as CO, NH3, and CH4. The sensor can give a faithful response to 1% H-2 in air, while the limitation for detecting H-2 in nitrogen is less than 1000 ppm. Influences of operation temperature and humidity on the sensing performance of the sensor were also investigated. The mechanism of the present sensor was attributed to the partial reduction of Ti4+ to Ti3+ by hydrogen catalyzed by a thin film of surface-oxidized Pt nanoparticles.

引用

页码：3953 / 3957

页数：5

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