Organic electrochemical transistors based on a dielectrophoretically aligned nanowire array
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
Nanoscale Research Letters 2011, 6:339 doi:10.1186/1556-276X-6-339Published: 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.