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Organic electrochemical transistors based on a dielectrophoretically aligned nanowire array.

Choi W, An T, Lim G - Nanoscale Res Lett (2011)

Bottom Line: Dielectrophoretically aligned nanowires formed a one-dimensional submicron bundle between triangular electrodes.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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, POSTECH, 790-784 Pohang, Republic of Korea. limmems@postech.ac.kr.

ABSTRACT
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.

No MeSH data available.


Schematic diagram of an organic electrochemical transistor based on a CNT-Nafion nanowire bundle.
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Figure 1: Schematic diagram of an organic electrochemical transistor based on a CNT-Nafion nanowire bundle.

Mentions: Recently, we have developed a real-time, label-free, step-wise, and target-specific aptasensor for protein molecules using dielectrophoretically aligned single-walled carbon nanotube (SWNT) films between patterned cantilever electrodes. We used the SWNT film as a two-terminal resistive sensor and demonstrated its excellent performance for detecting thrombin and vascular endothelial growth factor (VEGF). We verified that the SWNT film had p-type semiconductor properties in a phosphate buffer solution at pH 5.6 using blank electrodes of the cantilever array as gate electrodes [14]. The structure of this device can be adapted for OECTs composed of semiconducting material between two electrodes and a remote gate electrode in the surrounding electrolyte solutions (Figure 1) [10-12]. This fabrication method is applicable to other materials under positive dielectrophoretic conditions. In addition, CNTs offer mechanical support to the organic materials, and their composites can improve electrical properties, such as conductivity, conductance, and electronic transport [15-20]. Our objective was to synthesize CNT composite nanowires aligned between electrodes using dielectrophoresis and to exploit them as OECTs for sensor applications.


Organic electrochemical transistors based on a dielectrophoretically aligned nanowire array.

Choi W, An T, Lim G - Nanoscale Res Lett (2011)

Schematic diagram of an organic electrochemical transistor based on a CNT-Nafion nanowire bundle.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211427&req=5

Figure 1: Schematic diagram of an organic electrochemical transistor based on a CNT-Nafion nanowire bundle.
Mentions: Recently, we have developed a real-time, label-free, step-wise, and target-specific aptasensor for protein molecules using dielectrophoretically aligned single-walled carbon nanotube (SWNT) films between patterned cantilever electrodes. We used the SWNT film as a two-terminal resistive sensor and demonstrated its excellent performance for detecting thrombin and vascular endothelial growth factor (VEGF). We verified that the SWNT film had p-type semiconductor properties in a phosphate buffer solution at pH 5.6 using blank electrodes of the cantilever array as gate electrodes [14]. The structure of this device can be adapted for OECTs composed of semiconducting material between two electrodes and a remote gate electrode in the surrounding electrolyte solutions (Figure 1) [10-12]. This fabrication method is applicable to other materials under positive dielectrophoretic conditions. In addition, CNTs offer mechanical support to the organic materials, and their composites can improve electrical properties, such as conductivity, conductance, and electronic transport [15-20]. Our objective was to synthesize CNT composite nanowires aligned between electrodes using dielectrophoresis and to exploit them as OECTs for sensor applications.

Bottom Line: Dielectrophoretically aligned nanowires formed a one-dimensional submicron bundle between triangular electrodes.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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, POSTECH, 790-784 Pohang, Republic of Korea. limmems@postech.ac.kr.

ABSTRACT
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.

No MeSH data available.