Anomalous vibrational properties induced by surface effects in capped Pt nanoparticles

Lisandro J. Giovanetti, José M. Ramallo-López, Félix G. Requejo, Domingo I. Garcia-Gutierrez, Miguel Jose-Yacaman, Aldo F. Craievich

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The Debye temperature of Pt nanoparticles (NP) capped in PVP-K30 with an average diameter of 3 nm was determined from extended X-ray absorption fine structure measurements between 20 and 373 K. The size distribution of the NP was determined by high-resolution transmission electron microscopy, high-angle annular dark field, and small-angle X-ray scattering. We have experimentally established that the Debye temperature of truncated cuboctahedron, capped Pt NP is 70 K higher than that of bulk Pt metal. The rather high value of the Debye temperature of nanosized-capped Pt crystals is related to surface Pt-Pt contraction effects in conjunction with capping interactions. This finding evidences that the vibrational behavior of nanostructure materials differs markedly from that of materials in bulk form.

Original languageEnglish (US)
Pages (from-to)7599-7604
Number of pages6
JournalJournal of Physical Chemistry C
Issue number21
StatePublished - May 31 2007
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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