Ultrasensitive NH3 Gas Sensor from Polyaniline Nanograin Enchased TiO2 Fibers

详细信息    查看全文

• 作者：Jian Gong ; Yinhua Li ; Zeshan Hu ; Zhengzhi Zhou ; Yulin Deng
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：June 3, 2010
• 年：2010
• 卷：114
• 期：21
• 页码：9970-9974
• 全文大小：228K
• 年卷期：v.114,no.21(June 3, 2010)
• ISSN：1932-7455

文摘

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 (PANI), 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.