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Organic electrochemical transistors based on a dielectrophoretically aligned nanowire array

WooSeok Choi1, Taechang An1 and Geunbae Lim12*

Author Affiliations

1 Department of Mechanical Engineering, POSTECH, 790-784 Pohang, Republic of Korea

2 Division of Integrative Bioscience and Biotechnology, POSTECH, 790-784 Pohang, Republic of Korea

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Nanoscale Research Letters 2011, 6:339  doi:10.1186/1556-276X-6-339

Published: 14 April 2011


In this study, we synthesized an organic electrochemical transistor (OECT) using dielectrophoresis of a carbon nanotube-Nafion (CNT-Nafion) suspension. Dielectrophoretically aligned nanowires formed a one-dimensional submicron bundle between triangular electrodes. The CNT-Nafion composite nanowire bundles showed p-type semiconductor characteristics. The drain-source current decreased with increasing gate voltage. The nanowire bundles showed potential as pH sensor because the drain-source current ratio varied linearly according to the gate voltage in pH buffers.