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Fabrication and Characterization of a Poly (3-Hexylthiophene) Thin Film Micro-sensor for Hypergolic Vapor Detection

Published online by Cambridge University Press:  01 February 2011

Huihua Shu ,
Jiehui Wan ,
John Shu ,
Hong Yang  and
Bryan A. Chin
Huihua Shu
Affiliation:
[email protected], Auburn University, Materials Engineering, 275 Wilmore,Auburn University, Auburn, AL, 36830, United States
Jiehui Wan
Affiliation:
[email protected], Auburn University, Auburn, AL, 36849, United States
John Shu
Affiliation:
[email protected], Auburn University, Auburn, AL, 36849, United States
Hong Yang
Affiliation:
[email protected], Auburn University, Auburn, AL, 36849, United States
Bryan A. Chin
Affiliation:
[email protected], Auburn University, Auburn, AL, 36849, United States
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Abstract

A passive chemiresistor micro-sensor was investigated for the detection of hydrazine compounds. Hydrazine compounds are a highly toxic and carcinogenic species exhibiting toxic effects in humans at very low levels of exposure. Therefore, a sensor capable of detecting ppb levels of hydrazine compounds is required to insure the safety of personnel. The present study describes the fabrication, testing, and characterization of a low-cost, ultrasensitive Poly (3-Hexylthiophene) (P3HT) thin film-based micro-sensor for the detection of hydrazine compounds. Standard microelectronic manufacturing techniques were used to form a micro-sensor composed of a silicon substrate, interdigitated gold electrodes, and P3HT sensing film. Responses of the micro-sensor to hydrazine compounds at different temperatures and concentration levels are reported. When exposed to 25 ppm hydrazine in nitrogen, the sensor's resistance was measured to change from a few ohms to over 10 Megaohms. The thermal stability of the P3HT micro-sensor and the method to improve thermal stability are also explored. Thermally annealing the P3HT micro-sensor was found to improve thermal stability at high temperatures. Moreover, the sensor exhibits good specificity to hydrazine and does not respond to the presence of NO2 and/or N2O.

Keywords

sensorthin filmannealing
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 951: Symposium E – Nanofunctional Materials, Nanostructures and Novel Devices for Biological and Chemical Detection , 2006 , 0951-E06-32
Copyright
Copyright © Materials Research Society 2007

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References

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