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Electrophoretic Integration of Polyaniline on NIST Microhotplate for Gas Sensing

Published online by Cambridge University Press:  15 February 2011

Guofeng Li  and
Steve Semancik
Guofeng Li*
Affiliation:
Chemical Science and Technology Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899-8362, USA Research and Development Center, GEO-CENTERS Inc., 9460 Innovation Drive, Manassas, VA 20110,USA
Steve Semancik
Affiliation:
Chemical Science and Technology Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899-8362, USA
*
*Corresponding authors: Guofeng Li, Email: guofeng.li@nist.gov; Phone: 301-975-4782; Mailing address: NIST, 100 Bureau Drive, MS 8362, Gaithersburg, MD 20899-8362, USA
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Abstract

We present a method for controlled deposition of polyaniline from a colloidal suspension. Stable suspensions of polyaniline colloids were formed by dispersing polyaniline/formic-acid solutions into acetonitrile. It is demonstrated that the positively charged polyaniline colloids can be electrophoretically patterned onto microfabricated device features with great precision and control. Futhermore, the electrophoretically deposited polyaniline films reveal a nanoporous morphology, which greatly enhances the gas diffusion that leads to improved sensor performance.

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References

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