Ultrasensitive NH3 Gas Sensor from Polyaniline Nanograin Enchased TiO2 Fibers

被引：261

作者：

Gong, Jian ^{[1
,2
]}

Li, Yinhua ^{[1
]}

Hu, Zeshan ^{[1
]}

Zhou, Zhengzhi ^{[1
]}

Deng, Yulin ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

[2] NE Normal Univ, Dept Chem, Minist Educ, Key Lab Polyoxometalate Sci, Changchun 130024, Jilin, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 21期

关键词：

FABRICATION;

D O I：

10.1021/jp100685r

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：

In this communication, we reported for the first time an ultrasensitive nanostructrued sensor that can detect 50 ppt of NH3 gas in air. Specifically, nanograins of a p-type conductive polymer, polyaniline (PAN!), are enchased on an electrospun n-type semiconductive TiO2 fiber surface. The resistance of the p-n heterojunctions combining with the bulk resistance of PANI nanograins can function as electric current switches when NH3 gas is absorbed by PANI nanoparticles. As a result, the sensor sensitivity can be significantly improved. The sensor fabricated in this work is 1000 times more sensitive than the best PANI sensor reported in the literature.

引用

页码：9970 / 9974

页数：5

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