Covalently functionalized double-walled carbon nanotubes combine high sensitivity and selectivity in the electrical detection of small molecules

Jia Huang, Allen L. Ng, Yanmei Piao, Chien Fu Chen, Alexander A. Green, Chuan Fu Sun, Mark C Hersam, Cheng S. Lee, Yuhuang Wang

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Atom-thick materials such as single-walled carbon nanotubes (SWCNTs) and graphene exhibit ultrahigh sensitivity to chemical perturbation partly because all of the constituent atoms are surface atoms. However, low selectivity due to nonspecific binding on the graphitic surface is a challenging issue to many applications including chemical sensing. Here, we demonstrated simultaneous attainment of high sensitivity and selectivity in thin-film field effect transistors (TFTs) based on outer-wall selectively functionalized double-walled carbon nanotubes (DWCNTs). With carboxylic acid functionalized DWCNT TFTs, we obtained excellent gate modulation (on/off ratio as high as 4000) with relatively high ON currents at a CNT areal density as low as 35 ng/cm 2. The devices displayed an NH3 sensitivity of 60 nM (or ∼1 ppb), which is comparable to small molecule aqueous solution detection using state-of-the-art SWCNT TFT sensors while concomitantly achieving 6000 times higher chemical selectivity toward a variety of amine-containing analyte molecules over that of other small molecules. These results highlight the potential of using covalently functionalized double-walled carbon nanotubes for simultaneous ultrahigh selective and sensitive detection of chemicals and illustrate some of the structural advantages of this double-wall materials strategy to nanoelectronics.

Original languageEnglish
Pages (from-to)2306-2312
Number of pages7
JournalJournal of the American Chemical Society
Volume135
Issue number6
DOIs
Publication statusPublished - Feb 13 2013

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Carbon Nanotubes
Thin film transistors
Field effect transistors
Carbon nanotubes
Single-walled carbon nanotubes (SWCN)
Atoms
Molecules
Gates (transistor)
Nanoelectronics
Graphite
Carboxylic Acids
Carboxylic acids
Graphene
Amines
Modulation
Sensors
Equipment and Supplies

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Covalently functionalized double-walled carbon nanotubes combine high sensitivity and selectivity in the electrical detection of small molecules. / Huang, Jia; Ng, Allen L.; Piao, Yanmei; Chen, Chien Fu; Green, Alexander A.; Sun, Chuan Fu; Hersam, Mark C; Lee, Cheng S.; Wang, Yuhuang.

In: Journal of the American Chemical Society, Vol. 135, No. 6, 13.02.2013, p. 2306-2312.

Research output: Contribution to journalArticle

Huang, Jia ; Ng, Allen L. ; Piao, Yanmei ; Chen, Chien Fu ; Green, Alexander A. ; Sun, Chuan Fu ; Hersam, Mark C ; Lee, Cheng S. ; Wang, Yuhuang. / Covalently functionalized double-walled carbon nanotubes combine high sensitivity and selectivity in the electrical detection of small molecules. In: Journal of the American Chemical Society. 2013 ; Vol. 135, No. 6. pp. 2306-2312.
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