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Controlled Electrophoretic Patterning of Polyaniline From a Colloidal Suspension



Guofeng Li, C Martinez, Stephen Semancik


We present a method for controlled deposition of polyaniline from its colloidal suspension. The stable suspension of polyaniline colloids (~ 115 nm in diameter) was formed by dispersing polyaniline/formic-acid solution into acetonitrile. It was demonstrated that the positively charged polyaniline colloids can be electrophoretically deposited onto various substrate materials such as platinum and ITO, forming continuous ultra-thin films. We examined the film morphology, as well as the effects of process parameters, such as deposition time, colloid concentration, and applied voltage, on the deposition efficiency. Furthermore, the efficacy of the technique was illustrated by electrophoretically patterning polyaniline onto selected individual micron-scale sensing elements within a microfabricated sensor array, and by further demonstrating its sensitivity to gaseous analytes including water and methanol.
Journal of the American Chemical Society
No. 13


chemical sensor, colloids, electrophoretic deposition, polyaniline


Li, G. , Martinez, C. and Semancik, S. (2005), Controlled Electrophoretic Patterning of Polyaniline From a Colloidal Suspension, Journal of the American Chemical Society (Accessed July 22, 2024)


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Created April 1, 2005, Updated February 17, 2017