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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.


Microscope images of the CNT/Nafion nanowire fabrication process. (a) Attraction of the CNT and Nafion molecules between electrodes with an AC electric field; (b) compression of the CNT and Nafion by suspension evaporation; (c) A CNT-Nafion composite nanowire synthesized between electrodes.
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Figure 2: Microscope images of the CNT/Nafion nanowire fabrication process. (a) Attraction of the CNT and Nafion molecules between electrodes with an AC electric field; (b) compression of the CNT and Nafion by suspension evaporation; (c) A CNT-Nafion composite nanowire synthesized between electrodes.

Mentions: Figure 2 shows the CNT-Nafion nanowire synthesis using dielectrophoresis. CNTs and Nafion molecules were gathered between the electrodes where the electric-field gradient was larger, because of their higher conductivity compared with the surrounding medium (Figure 2a). After the suspension was partially removed, the remaining suspension was compressed to form a concave meniscus with evaporation due to the surface tension between the electrodes and suspension (Figure 2b). As a result, the electric current was concentrated through the compressed CNTs and the surrounding Nafion, which bonded the CNT in the shape of the solution. A nanowire bundle with a submicron diameter was synthesized (Figure 2c).


Organic electrochemical transistors based on a dielectrophoretically aligned nanowire array.

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

Microscope images of the CNT/Nafion nanowire fabrication process. (a) Attraction of the CNT and Nafion molecules between electrodes with an AC electric field; (b) compression of the CNT and Nafion by suspension evaporation; (c) A CNT-Nafion composite nanowire synthesized between electrodes.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: Microscope images of the CNT/Nafion nanowire fabrication process. (a) Attraction of the CNT and Nafion molecules between electrodes with an AC electric field; (b) compression of the CNT and Nafion by suspension evaporation; (c) A CNT-Nafion composite nanowire synthesized between electrodes.
Mentions: Figure 2 shows the CNT-Nafion nanowire synthesis using dielectrophoresis. CNTs and Nafion molecules were gathered between the electrodes where the electric-field gradient was larger, because of their higher conductivity compared with the surrounding medium (Figure 2a). After the suspension was partially removed, the remaining suspension was compressed to form a concave meniscus with evaporation due to the surface tension between the electrodes and suspension (Figure 2b). As a result, the electric current was concentrated through the compressed CNTs and the surrounding Nafion, which bonded the CNT in the shape of the solution. A nanowire bundle with a submicron diameter was synthesized (Figure 2c).

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.