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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.


Difference of CNT and CNT-Nafion composite nanowire bundles. SEM image of (a, b) CNT nanowire bundles and (c, d) CNT-Nafion composite nanowire bundles. (e) EDS analysis of the CNT-Nafion nanowire bundles.
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Figure 3: Difference of CNT and CNT-Nafion composite nanowire bundles. SEM image of (a, b) CNT nanowire bundles and (c, d) CNT-Nafion composite nanowire bundles. (e) EDS analysis of the CNT-Nafion nanowire bundles.

Mentions: Figure 3a, b shows a scanning electron microscope (SEM) image of a CNT bundle, and Figure 3c, d shows Nafion-coated CNT bundles. The Nafion wrapped the CNT bundle entirely, while CNT gathered individually. Figure 3e shows the energy dispersive X-ray spectroscopy (EDS) graph of CNT-Nafion nanowire bundles, which were 10% fluorine due to the Nafion composition. Immediately after synthesizing the nanowire bundles, the resistance of the CNT bundles was approximately 5 kΩ. In contrast, that of the CNT-Nafion bundles was found to be approximately 2 kΩ. Based on the SEM image, EDS graph, and electrical properties, the nanowire bundles synthesized were likely CNT-Nafion composites. As we reported previously [14], the SWNT-film was synthesized uniformly between flat cantilever electrodes; however, CNT-Nafion nanowires were synthesized between triangular electrodes. Because the electric field was concentrated at the end of the electrode, and a thin concave meniscus formed during evaporation, the nanowire bundles had submicron diameters, rather than a film structure. This fabrication technique is based on the bottum-up method; consequently, it is a simple method for fabricating CNT nanowire composites using dielectrophoresis.


Organic electrochemical transistors based on a dielectrophoretically aligned nanowire array.

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

Difference of CNT and CNT-Nafion composite nanowire bundles. SEM image of (a, b) CNT nanowire bundles and (c, d) CNT-Nafion composite nanowire bundles. (e) EDS analysis of the CNT-Nafion nanowire bundles.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: Difference of CNT and CNT-Nafion composite nanowire bundles. SEM image of (a, b) CNT nanowire bundles and (c, d) CNT-Nafion composite nanowire bundles. (e) EDS analysis of the CNT-Nafion nanowire bundles.
Mentions: Figure 3a, b shows a scanning electron microscope (SEM) image of a CNT bundle, and Figure 3c, d shows Nafion-coated CNT bundles. The Nafion wrapped the CNT bundle entirely, while CNT gathered individually. Figure 3e shows the energy dispersive X-ray spectroscopy (EDS) graph of CNT-Nafion nanowire bundles, which were 10% fluorine due to the Nafion composition. Immediately after synthesizing the nanowire bundles, the resistance of the CNT bundles was approximately 5 kΩ. In contrast, that of the CNT-Nafion bundles was found to be approximately 2 kΩ. Based on the SEM image, EDS graph, and electrical properties, the nanowire bundles synthesized were likely CNT-Nafion composites. As we reported previously [14], the SWNT-film was synthesized uniformly between flat cantilever electrodes; however, CNT-Nafion nanowires were synthesized between triangular electrodes. Because the electric field was concentrated at the end of the electrode, and a thin concave meniscus formed during evaporation, the nanowire bundles had submicron diameters, rather than a film structure. This fabrication technique is based on the bottum-up method; consequently, it is a simple method for fabricating CNT nanowire composites using dielectrophoresis.

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.