Ordered arrays of Au nanoclusters by TiOx ultrathin templates on Pt(111)

Francesco Sedona, Stefano Agnoli, Mattia Fanetti, Iskandar Kholmanov, Emanuele Cavaliere, Luca Gavioli, Gaetano Granozzi

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


Ultrathin ordered films of TiOx (x~1) on Pt(111) has been investigated by scanning tunneling microscopy (STM) to test their capability as templates for growing ordered and monodispersed Au nanocluster arrays. The ordered array of parallel black troughs spaced by 1.44 nm, observed in the STM data of the zigzag-like TiOx ultrathin film, revealed to be a good template for growing a linear array of Au clusters, with a mean size of 1.3 nm and a narrow dispersion. The wagon-wheel-like TiOx film, having similar chemical composition but without a nanostructured array of defects, does not show templating effects, leading to nucleation of disordered and larger Au clusters (mean size of 3.4 nm with a large dispersion). Hence this work shows that the ordering of the deposited Au nanoclusters is strongly dependent on the actual defectivity of the film. Annealing the Au cluster arrays at high temperature produces drastic changes in the spatial arrangement of the clusters, which has been interpreted as the consequence of the changes in the ultrathin film template.
Original languageEnglish
Pages (from-to)8024-8029
Number of pages6
Publication statusPublished - 2007


  • STM
  • cluster
  • defects
  • gold
  • morphology
  • self assembling
  • titania


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