Molecular adsorption onto metallic quantum wires

A. Bogozi, O. Lam, H. He, C. Li, N. J. Tao, L. A. Nagahara, I. Amlani, R. Tsui

Research output: Contribution to journalArticlepeer-review

92 Scopus citations


We have studied the adsorption of mercaptopropionic acid, 2,2′-bipyridine, and dopamine onto electrochemically fabricated Cu nanowires. The nanowires are atomically thin with conductance quantized near integer multiples of 2e2/h. Upon molecular adsorption, the quantized conductance decreases to a fractional value, due to the scattering of the conduction electrons by the adsorbates. The decrease is as high as 50% for the thinnest nanowires whose conductance is at the lowest quantum step, and smaller for thicker nanowires with conductance at higher quantum steps. The adsorbate-induced conductance changes depend on the binding strengths of the molecules to the nanowires, which are in the order of mercaptopropionic acid, 2,2′-bipyridine, and dopamine, from strongest to weakest. The sensitive dependence of the quantized conductance on molecular adsorption may be used for molecular detection.

Original languageEnglish (US)
Pages (from-to)4585-4590
Number of pages6
JournalJournal of the American Chemical Society
Issue number19
StatePublished - Oct 14 2001
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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