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

Ming P. Lu*, Cheng Y. Hsiao, Po Yuan Lo, Jeng H. Wei, Yuh-Shyong Yang, Ming J. Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

We fabricate and measure a single-walled carbon nanotube transistor having a liquid-gate electrode. The ratio value of Ion Ioff is as high as 104, 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.

Original languageEnglish
Article number053114
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume88
Issue number5
DOIs
StatePublished - 10 Feb 2006

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