Selective activation and passivation of nanoparticle catalysts through substrate mediation

Kuniyil Prabhakaran, Yoshio Watanabe, Yoshikazu Homma, Toshio Ogino, B. Q. Wei, Pulickel M. Ajayan, Kurikka V.P.M. Shafi, Abraham Ulman, Stefan Heun, Andrea Locatelli, Salia Cherifi

Research output: Contribution to journalLetterpeer-review


Fe nanoparticles are synthesized on a silicon wafer, by the reduction of Fe2O3 nanoparticles, through a bonding partner change reaction involving silicon atoms from the substrate. On a silicon surface with germanium nanostructures grown on it, the catalyst particles are selectively activated and passivated. This has been achieved primarily by exploiting the vast differences in the reduction temperature of the oxide particles on silicon and germanium surfaces. We demonstrate this by growing carbon nanotubes selectively interconnecting the germanium nanostructures. The mechanisms of activation and passivation are discussed.

Original languageEnglish (US)
Pages (from-to)10629-10631
Number of pages3
Issue number26
StatePublished - Dec 23 2003

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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