Deposition of CTAB-terminated nanorods on bacteria to form highly conducting hybrid systems

Vikas Berry, Anand Gole, Subrata Kundu, Catherine J. Murphy, Ravi F. Saraf

Research output: Contribution to journalArticle

148 Scopus citations

Abstract

Gold nanorods and nanospheres capped with positively charged CTAB are deposited on the surface of gram-positive bacterium having negatively charged teichoic acid brushes. The deposition rate is more than an order of magnitude faster than that for peptide and nucleic acid capped nanoparticles. For the nanorods, never been reported before, the strong electrostatic attraction causes the rods to bend conformally over the curved bacterium surface in random orientations. This leads to formation of an efficient percolating cluster (i.e., low contact resistance and high radius of gyration) with 104-fold higher current at 3-fold lower coverage compared to a monolayer from nanospheres. The high monolayer conductivity at only ∼10% coverage for nanorods has potential for fabricating a novel class of bioelectronic devices by coupling electronic "nanocircuitry" at the surface to the biological function of microorganisms.

Original languageEnglish (US)
Pages (from-to)17600-17601
Number of pages2
JournalJournal of the American Chemical Society
Volume127
Issue number50
DOIs
StatePublished - Dec 21 2005

ASJC Scopus subject areas

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

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