A chemical sensor for chloromethanes using a nanocomposite of multiwalled carbon nanotubes with poly(3-methylthiophene)

被引：71
作者：
Santhanam, KSV [1 ]
Sangoi, R
Fuller, L
机构：
[1] Rochester Inst Technol, Ctr Mat Sci & Engn, Rochester, NY 14623 USA
[2] Rochester Inst Technol, Dept Chem, Rochester, NY 14623 USA
[3] Rochester Inst Technol, Dept Microelect Engn, Rochester, NY 14623 USA
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2005年 / 106卷 / 02期
关键词：
multiwalled carbon nanotubes; poly(3-methylthiophene); chlorinated methanes; nanocomposite;
D O I：
10.1016/j.snb.2004.09.034
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A vapor phase chemical sensor with a viewing area of 0.78 mm(2) (diameter 1 mm) is constructed using a novel nanocomposite material made up of multiwalled carbon nanotubes and poly (3-methylthiophene) that shows a change in electrical resistance upon exposure to different chloromethanes. The resistance change is proportional to the concentration of the analyte. The sensor does not respond to methane, acetone, acetaldehyde, benzaldehyde, tetrahydrofuran, methanol and ethanol. The nanocomposite is characterized by well defined transitions in Fourier transform infrared spectroscopy and thermogravimetric analysis. The response time of the sensor is generally about 60-120 s. The sensor is capable of selectivity to any mixture made up of chloromethane and methane. The mechanism of sensing of chloromethanes is discussed. (c) 2004 Elsevier B.V. All rights reserved.
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收藏
页码：766 / 771
页数：6
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