Semiconducting single-walled carbon nanotubes exposed to distilled water and aqueous solution: Electrical measurement and theoretical calculation

We fabricate and measure a single-walled carbon nanotube transistor having a liquid-gate electrode. The ratio value of I on ∕ I off is as high as 10 4 , indicating the presence of a semiconducting channel. A passivation layer over the source/drain electrode greatly suppresses the liquid-gate leakage...

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Veröffentlicht in:Applied physics letters 2006-01, Vol.88 (5), p.053114-053114-3
Hauptverfasser: Lu, Ming-Pei, Hsiao, Cheng-Yun, Lo, Po-Yuan, Wei, Jeng-Hua, Yang, Yuh-Shyong, Chen, Ming-Jer
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container_issue 5
container_start_page 053114
container_title Applied physics letters
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creator Lu, Ming-Pei
Hsiao, Cheng-Yun
Lo, Po-Yuan
Wei, Jeng-Hua
Yang, Yuh-Shyong
Chen, Ming-Jer
description We fabricate and measure a single-walled carbon nanotube transistor having a liquid-gate electrode. The ratio value of I on ∕ I off is as high as 10 4 , indicating the presence of a semiconducting channel. A passivation layer over the source/drain electrode greatly suppresses the liquid-gate leakage by about three orders of magnitude. The channel currents are noticeably distinct between two liquid samples: distilled water and aqueous solution ( 1 × 10 − 4 M NaCl). This biological sensing ability is attributed to the different electrical double-layer capacitances with respect to the bulk part of the channel. The corresponding theoretical calculation is carried out in detail.
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title Semiconducting single-walled carbon nanotubes exposed to distilled water and aqueous solution: Electrical measurement and theoretical calculation
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