Related Experiment Video
Updated: May 31, 2026
09:14
Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices
Published on: December 7, 2017
Organic electrochemical transistors based on a dielectrophoretically aligned nanowire array
Wooseok Choi1, Taechang An, Geunbae Lim
1Department of Mechanical Engineering, POSTECH, 790-784 Pohang, Republic of Korea. limmems@postech.ac.kr.
Nanoscale Research Letters
|June 30, 2011
Summary
Researchers created a carbon nanotube-Nafion organic electrochemical transistor (OECT) that functions as a pH sensor. The device exhibits p-type semiconductor behavior, with current changing linearly with gate voltage in different pH buffers.
Area of Science:
- Materials Science
- Nanotechnology
- Electronics
Background:
- Organic electrochemical transistors (OECTs) are crucial for biosensing applications.
- Carbon nanotube (CNT) composites offer unique electronic and sensing properties.
- Precise alignment of nanomaterials is key to device performance.
Purpose of the Study:
- To synthesize and characterize a novel OECT using a CNT-Nafion composite.
- To investigate the semiconductor properties of dielectrophoretically aligned CNT-Nafion nanowires.
- To evaluate the potential of the synthesized OECT as a pH sensor.
Main Methods:
- Synthesis of a carbon nanotube-Nafion (CNT-Nafion) suspension.
- Dielectrophoresis was employed to align CNT-Nafion nanowires into one-dimensional submicron bundles between triangular electrodes.
- Characterization of the electrical properties of the CNT-Nafion composite nanowire bundles.
Main Results:
- Dielectrophoretically aligned CNT-Nafion nanowires formed stable one-dimensional bundles.
- The CNT-Nafion composite nanowire bundles exhibited p-type semiconductor characteristics.
- A linear relationship was observed between the drain-source current ratio and gate voltage in various pH buffers, indicating pH sensitivity.
Conclusions:
- The study successfully synthesized an OECT based on dielectrophoretically aligned CNT-Nafion nanowires.
- The developed OECT demonstrates promising p-type semiconductor behavior.
- The CNT-Nafion OECT shows significant potential for application as a sensitive and reliable pH sensor.
