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Temperature-dependent EXAFS analysis of embedded Pt nanocrystals

Giulian, Raquel; Araujo, Leandro; Kluth, Patrick; Sprouster, David; Schnohr, Claudia; Foran, Garry J; Ridgway, Mark C

Description

The vibrational and thermal properties of embedded Pt nanocrystals (NCs) have been investigated with temperature-dependent extended x-ray absorption fine structure (EXAFS) spectroscopy. NCs of diameter 1.8-7.4nm produced by ion implantation in amorphous SiO2 were analysed over the temperature range 20-295K. An increase in Einstein temperature (∼194K) relative to that of a Pt standard (∼179K) was evident for the smallest NCs while those larger than ∼2.0nm exhibited values comparable to bulk...[Show more]

dc.contributor.authorGiulian, Raquel
dc.contributor.authorAraujo, Leandro
dc.contributor.authorKluth, Patrick
dc.contributor.authorSprouster, David
dc.contributor.authorSchnohr, Claudia
dc.contributor.authorForan, Garry J
dc.contributor.authorRidgway, Mark C
dc.date.accessioned2015-12-07T22:23:20Z
dc.identifier.issn0953-8984
dc.identifier.urihttp://hdl.handle.net/1885/20625
dc.description.abstractThe vibrational and thermal properties of embedded Pt nanocrystals (NCs) have been investigated with temperature-dependent extended x-ray absorption fine structure (EXAFS) spectroscopy. NCs of diameter 1.8-7.4nm produced by ion implantation in amorphous SiO2 were analysed over the temperature range 20-295K. An increase in Einstein temperature (∼194K) relative to that of a Pt standard (∼179K) was evident for the smallest NCs while those larger than ∼2.0nm exhibited values comparable to bulk material. Similarly, the thermal expansion of interatomic distances was lowest for small NCs. While the amorphous SiO2 matrix restricted the thermal expansion of interatomic distances, it did not have a significant influence on the mean vibrational frequency of embedded Pt NCs. Instead, the latter was governed by finite-size effects or, specifically, capillary pressure.
dc.publisherInstitute of Physics Publishing
dc.sourceJournal of Physics: Condensed Matter
dc.subjectKeywords: Bulk materials; Capillary pressures; Einstein temperatures; Extended X-ray absorption fine structure spectroscopies; Finite-size effects; Inter-atomic distances; matrixes; Temperature dependents; Temperature ranges; Temperature-dependent exafs; Thermal pr
dc.titleTemperature-dependent EXAFS analysis of embedded Pt nanocrystals
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume21
dc.date.issued2009
local.identifier.absfor020406 - Surfaces and Structural Properties of Condensed Matter
local.identifier.absfor100708 - Nanomaterials
local.identifier.ariespublicationu4363964xPUB13
local.type.statusPublished Version
local.contributor.affiliationGiulian, Raquel, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationAraujo, Leandro, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationKluth, Patrick, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSprouster, David, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSchnohr, Claudia, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationForan, Garry J, Australian Nuclear Science and Technology Organisation
local.contributor.affiliationRidgway, Mark C, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue15
local.bibliographicCitation.startpage155302/1
local.bibliographicCitation.lastpage6
local.identifier.doi10.1088/0953-8984/21/15/155302
dc.date.updated2016-02-24T11:06:22Z
local.identifier.scopusID2-s2.0-65449137064
local.identifier.thomsonID000264708600008
CollectionsANU Research Publications

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