Stability, oxidation and shape evolution of PVP-capped Pd nanocrystals

Simple item page
dc.contributor.authorCollins, Gillian
dc.contributor.authorSchmidt, Michael
dc.contributor.authorMcGlacken, Gerard P.
dc.contributor.authorO'Dwyer, Colm
dc.contributor.authorHolmes, Justin D.
dc.contributor.funderEnterprise Irelanden
dc.contributor.funderIrish Research Council for Science Engineering and Technologyen
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderUniversity College Corken
dc.date.accessioned2016-02-04T14:14:08Z
dc.date.available2016-02-04T14:14:08Z
dc.date.issued2014-03-06
dc.date.updated2014-04-08T10:26:39Z
dc.description.abstractA critical aspect in the practical applications and catalytic performance of shape-controlled nanocrystals is their stability and morphology retention under ambient conditions. Changes to the morphology of shape-controlled Pd nanocrystals capped by PVP are assessed by TEM, and surface oxidation was evaluated by X-ray photoelectron spectroscopy (XPS) over 12 months. Surface oxidation of PVP-capped Pd nanocrystals resulted in the loss of edge and corner sites and a transition to spherical morphologies. The shape stability of the nanocrystals was found to follow the trend cubic < cuboctahedra < octahedral ∼ concave cubes. For low index planes, {111} surfaces were more resistant to oxidation compared to {100} facets, correlating with the surface free energy of the nanocrystals. Cubic and cuboctahedral nanocrystals transitioned to spherical particles while octahedral nanocrystals retained their morphology. The presence of high-energy {110} facets was observed in the cubic nanocrystals which undergo surface reconstruction. The presence of surface defects may also influence the rate of the structural changes. Concave cubic nanocrystals, which possess high index facets and surface energies, were consistently found to display excellent morphology retention. The concave cubic nanocrystals displayed superior shape stability and reduced oxidation compared to cubic and cuboctahedral nanocrystals. XPS analysis further determined that PVP capping ligands on different Pd surface facets strongly influenced the morphological consistency. The stability of the concave cubes can be attributed to the stronger chemisorption of PVP capping ligands to the high index planes, making them less susceptible to oxidation.en
dc.description.sponsorshipScience Foundation Ireland (Grant 08/CE/I1432); Enterprise Ireland (Grant IP/2011/0130); Irish Research Council (New Foundations Award); University College Cork (UCC Strategic Research Fund)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationCOLLINS, G., SCHMIDT, M., MCGLACKEN, G. P., O’DWYER, C. & HOLMES, J. D. 2014. Stability, Oxidation, and Shape Evolution of PVP-Capped Pd Nanocrystals. The Journal of Physical Chemistry C, 118, 6522-6530. http://dx.doi.org/10.1021/jp500716zen
dc.identifier.doi10.1021/jp500716z
dc.identifier.endpage6530en
dc.identifier.issn1932-7447
dc.identifier.issued12en
dc.identifier.journaltitleJournal of Physical Chemistry Cen
dc.identifier.startpage6522en
dc.identifier.urihttps://hdl.handle.net/10468/2251
dc.identifier.volume118en
dc.language.isoenen
dc.publisherAmerican Chemical Societyen
dc.relation.urihttp://pubs.acs.org/journal/jpccck
dc.rights© 2014 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/jp500716zen
dc.subjectLigandsen
dc.subjectMorphologyen
dc.subjectOxidationen
dc.subjectPhotoelectronsen
dc.subjectStabilityen
dc.subjectX ray photoelectron spectroscopyen
dc.subjectAmbient conditionsen
dc.subjectCatalytic performanceen
dc.subjectHigh index planesen
dc.subjectReduced oxidationen
dc.subjectSpherical morphologiesen
dc.subjectSpherical particleen
dc.subjectSurface free energyen
dc.subjectSurface oxidationsen
dc.subjectNanocrystalsen
dc.titleStability, oxidation and shape evolution of PVP-capped Pd nanocrystalsen
dc.typeArticle (peer-reviewed)en
Files
Original bundle
Now showing 1 - 2 of 2
Thumbnail Image
Name:
Collins_et_al_Manuscript_(jp-2014-00716z)_Clean.doc
Size:
33.01 MB
Format:
Microsoft Word
Description:
Author's Original
Thumbnail Image
Name:
GC_StabilityAV2014.pdf
Size:
2.54 MB
Format:
Adobe Portable Document Format
Description:
Accepted Version
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
2.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Chemistry - Journal Articles
Tyndall National Institute - Journal Articles