A comparative study of a polyindole-based microelectrochemical transistor in aqueous and non-aqueous electrolytes |
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Authors: | Vibha Saxena Vinay Shirodkar Rajiv Prakash |
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Institution: | (1) Institute of Science, 15 Madam Cama Road, Mumbai 400032, India, IN;(2) Industrial Toxicology Research Centre, PO Box 80, Lucknow 226001, India e-mail : intox@itrc.sirnetd.ernet.in, IN |
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Abstract: | The behaviour of a polyindole-based microelectrochemical transistor in aqueous and non-aqueous electrolytes is described.
The polyindole film was grown onto two closely spaced (100 μm) platinum microelectrodes by anodic oxidation of indole (10 mM)
from 0.1 M tetrabutylammonium perchlorate in dichloromethane at 1.1 V vs. Ag/AgCl. The polymerization was carried out for
a sufficiently long time in order to connect both Pt microelectrodes, which operated as a transistor when immersed in an electrolytic
solution. In this transistor, one microelectrode was a “source” and the other a “drain”; the Ag/AgCl wire reference electrode
was used as a “gate”. The drain current (current between source and drain) was modulated by varying the gate potential (potential
between source and gate) at a fixed drain potential (potential between source and drain). The transconductances of the transistor
were estimated as 0.98 mS/cm and 20.6 mS/cm of channel width (separation between two microelectrodes) in aqueous and non-aqueous
solutions, respectively.
Received: 6 April 1999 / Accepted: 24 August 1999 |
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Keywords: | Conducting polymer Polyindole Electrochemical transistor |
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