Hydrogen sensing with diameter- and chirality-sorted carbon nanotubes

Marc Ganzhorn, Aravind Vijayaraghavan, Simone Dehm, Frank Hennrich, Alexander A. Green, Maximilian Fichtner, Achim Voigt, Michael Rapp, Hilbert Von Löhneysen, Mark C Hersam, Manfred M. Kappes, Ralph Krupke

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The work function of palladium is known to be sensitive to hydrogen by the formation of a surface dipole layer or Pd hydride. One approach to detect such a change in the work function can be based on the formation of a Schottky barrier between the palladium metal and a semiconductor. Here, we study the hydrogen sensitivity of Schottky barrier field-effect transistors made for the first time from diameter- and chirality-sorted semiconducting single-walled carbon nanotubes (s-SWNTs) in contact with Pd electrodes. We observe an unrivaled 100-fold change in the on-state conductance at 100 ppm H2 compared to air for devices with s-SWNT and diameters between 1 and 1.6 nm. Hydrogen sensing is not observed for devices of Pd-contacted few-layer graphene (FLG), as expected due to the absence of a significant Schottky barrier. Unexpectedly, we observe also a vanishing sensitivity for small-diameter SWNTs. We explain this observation by changes in the nanotube work function caused by spillover and chemisorption of atomic hydrogen onto small-diameter nanotubes. We also observe that long-term sensing stability is only achieved if the gate voltage is inverted periodically. Under constant gate bias, the sensitivity reduces with time, which we relate to gate screening by accumulated charges in the substrate.

Original languageEnglish
Pages (from-to)1670-1676
Number of pages7
JournalACS Nano
Volume5
Issue number3
DOIs
Publication statusPublished - Mar 22 2011

Fingerprint

Carbon Nanotubes
Chirality
chirality
Hydrogen
Carbon nanotubes
carbon nanotubes
Palladium
Single-walled carbon nanotubes (SWCN)
hydrogen
Nanotubes
palladium
sensitivity
nanotubes
Graphite
Chemisorption
Field effect transistors
Hydrides
chemisorption
Graphene
hydrides

Keywords

  • chirality
  • diameter
  • hydrogen
  • Schottky barrier field-effect transistor
  • sensing
  • single-walled carbon nanotube
  • sorting

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Ganzhorn, M., Vijayaraghavan, A., Dehm, S., Hennrich, F., Green, A. A., Fichtner, M., ... Krupke, R. (2011). Hydrogen sensing with diameter- and chirality-sorted carbon nanotubes. ACS Nano, 5(3), 1670-1676. https://doi.org/10.1021/nn101992g

Hydrogen sensing with diameter- and chirality-sorted carbon nanotubes. / Ganzhorn, Marc; Vijayaraghavan, Aravind; Dehm, Simone; Hennrich, Frank; Green, Alexander A.; Fichtner, Maximilian; Voigt, Achim; Rapp, Michael; Von Löhneysen, Hilbert; Hersam, Mark C; Kappes, Manfred M.; Krupke, Ralph.

In: ACS Nano, Vol. 5, No. 3, 22.03.2011, p. 1670-1676.

Research output: Contribution to journalArticle

Ganzhorn, M, Vijayaraghavan, A, Dehm, S, Hennrich, F, Green, AA, Fichtner, M, Voigt, A, Rapp, M, Von Löhneysen, H, Hersam, MC, Kappes, MM & Krupke, R 2011, 'Hydrogen sensing with diameter- and chirality-sorted carbon nanotubes', ACS Nano, vol. 5, no. 3, pp. 1670-1676. https://doi.org/10.1021/nn101992g
Ganzhorn M, Vijayaraghavan A, Dehm S, Hennrich F, Green AA, Fichtner M et al. Hydrogen sensing with diameter- and chirality-sorted carbon nanotubes. ACS Nano. 2011 Mar 22;5(3):1670-1676. https://doi.org/10.1021/nn101992g
Ganzhorn, Marc ; Vijayaraghavan, Aravind ; Dehm, Simone ; Hennrich, Frank ; Green, Alexander A. ; Fichtner, Maximilian ; Voigt, Achim ; Rapp, Michael ; Von Löhneysen, Hilbert ; Hersam, Mark C ; Kappes, Manfred M. ; Krupke, Ralph. / Hydrogen sensing with diameter- and chirality-sorted carbon nanotubes. In: ACS Nano. 2011 ; Vol. 5, No. 3. pp. 1670-1676.
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