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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.


Characteristics of CNT-Nafion nanowire electrochemical transistors due to pH. (a) Normalized IDS versus VG characteristc curves in various pH buffers when VDS = 0.5 V. (b) Ratio of the normalized drain current to the gate voltage plotted against the pH of the CNT-Nafion nanowire electrochemical transistors.
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Figure 5: Characteristics of CNT-Nafion nanowire electrochemical transistors due to pH. (a) Normalized IDS versus VG characteristc curves in various pH buffers when VDS = 0.5 V. (b) Ratio of the normalized drain current to the gate voltage plotted against the pH of the CNT-Nafion nanowire electrochemical transistors.

Mentions: To investigate the influence of protons on the characteristics of CNT-Nafion composites, we measured the drain current with increasing gate voltage from 0 to 0.2 V while VDS was fixed at 0.5 V in various pH buffers. Figure 5a shows the normalized IDS divided by the drain-source current when VG = 0 V versus gate voltage characteristic curves in different pH buffers. As expected, because holes were the primary charge-carriers, the normalized drain-current decreased steeperly with increasing gate voltage under high proton concentrations (lower pH). The normalized drain current to gate voltage ratio was linearly dependent on the buffer pH (Figure 5b).


Organic electrochemical transistors based on a dielectrophoretically aligned nanowire array.

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

Characteristics of CNT-Nafion nanowire electrochemical transistors due to pH. (a) Normalized IDS versus VG characteristc curves in various pH buffers when VDS = 0.5 V. (b) Ratio of the normalized drain current to the gate voltage plotted against the pH of the CNT-Nafion nanowire electrochemical transistors.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Characteristics of CNT-Nafion nanowire electrochemical transistors due to pH. (a) Normalized IDS versus VG characteristc curves in various pH buffers when VDS = 0.5 V. (b) Ratio of the normalized drain current to the gate voltage plotted against the pH of the CNT-Nafion nanowire electrochemical transistors.
Mentions: To investigate the influence of protons on the characteristics of CNT-Nafion composites, we measured the drain current with increasing gate voltage from 0 to 0.2 V while VDS was fixed at 0.5 V in various pH buffers. Figure 5a shows the normalized IDS divided by the drain-source current when VG = 0 V versus gate voltage characteristic curves in different pH buffers. As expected, because holes were the primary charge-carriers, the normalized drain-current decreased steeperly with increasing gate voltage under high proton concentrations (lower pH). The normalized drain current to gate voltage ratio was linearly dependent on the buffer pH (Figure 5b).

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.