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

doi:10.1021/jp068419k

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 journal › Article › peer-review

12 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	7599-7604
Number of pages	6
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	21
DOIs	https://doi.org/10.1021/jp068419k
State	Published - May 31 2007
Externally published	Yes

ASJC Scopus subject areas

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

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title = "Anomalous vibrational properties induced by surface effects in capped Pt nanoparticles",

abstract = "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.",

author = "Giovanetti, \{Lisandro J.\} and Ramallo-L{\'o}pez, \{Jos{\'e} M.\} and Requejo, \{F{\'e}lix G.\} and Garcia-Gutierrez, \{Domingo I.\} and Miguel Jose-Yacaman and Craievich, \{Aldo F.\}",

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doi = "10.1021/jp068419k",

language = "English (US)",

volume = "111",

pages = "7599--7604",

journal = "Journal of Physical Chemistry C",

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TY - JOUR

T1 - Anomalous vibrational properties induced by surface effects in capped Pt nanoparticles

AU - Giovanetti, Lisandro J.

AU - Ramallo-López, José M.

AU - Requejo, Félix G.

AU - Garcia-Gutierrez, Domingo I.

AU - Jose-Yacaman, Miguel

AU - Craievich, Aldo F.

PY - 2007/5/31

Y1 - 2007/5/31

N2 - 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.

AB - 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.

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EP - 7604

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 21

ER -

Anomalous vibrational properties induced by surface effects in capped Pt nanoparticles

Abstract

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