In situ RHEED study of epitaxial gold nanocrystals on TiO 2 (1 1 0) surfaces

X. Chen, W. P. Gao, S. Sivaramakrishnan, H. F. Hu, J. M. Zuo

Research output: Contribution to journalArticlepeer-review


We report a study of epitaxial gold nanocrystals (NCs) on rutile (TiO 2 (1 1 0)) surfaces using reflection high energy electron diffraction (RHEED) and ex situ electron imaging. The NCs are determined by RHEED have almost pure (1 1 1) out-of-plane epitaxy with the twin in-plane orientation relationships of [-1 1 0] Au - [0 0 1] TiO2 and [1 -1 0] Au - [0 0 1] TiO2. The epitaxial Au NCs are formed by thermal annealing after depositing 0.1-0.4 nm nominal thick Au on TiO2. In situ RHEED monitoring shows that significant Au NC crystallization occurs at >500°C annealing temperatures for nanoparticles that are of ∼2 nm in diameter. The NCs are faceted as evidenced by the shape of RHEED diffraction spots and electron imaging. The sharpness of the epitaxial Au RHEED diffraction spots with ∼0.55 nm-1 FWHM allows a measurement of thermal properties of Au/TiO2, such as thermal expansion and Debye temperature of Au NCs on TiO2.

Original languageEnglish (US)
Pages (from-to)661-666
Number of pages6
JournalApplied Surface Science
StatePublished - Apr 1 2013


  • Epitaxy
  • Gold nanoparticles
  • in situ RHEED
  • Nanocrystals
  • Titanium oxide

ASJC Scopus subject areas

  • Surfaces, Coatings and Films


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