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Acoustic Vibrations of Core–Shell Nanospheres: Probing the Mechanical Contact at the Metal–Dielectric Interface

hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorDACOSTA FERNANDES, Benoit
hal.structure.identifierCentre de Recherche Paul Pascal [CRPP]
dc.contributor.authorVILAR-VIDAL, Noelia
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorBAIDA, Hatim
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMASSÉ, Pascal
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorOBERLÉ, Jean
hal.structure.identifierCentre de Recherche Paul Pascal [CRPP]
dc.contributor.authorRAVAINE, Serge
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorTRÉGUER-DELAPIERRE, Mona
hal.structure.identifierLaboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
dc.contributor.authorSAVIOT, Lucien
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorLANGOT, Pierre
hal.structure.identifierLaboratoire Ondes et Matière d'Aquitaine [LOMA]
dc.contributor.authorBURGIN, Julien
dc.date.created2017-12-21
dc.date.issued2018
dc.identifier.issn1932-7447
dc.description.abstractEnThe acoustic vibrations of metal−dielectric core−shell nanoparticles (Ag@SiO2 and Au@SiO2) are investigated using ultrafast pump−probe spectroscopy. The experimental results are in good agreement with calculations of the period of the breathing vibration of the core−shell particles. The transition from one overtone of the breathing mode to the next one as the size of the silica shell increases is observed for slightly thinner SiO2 shells than previously reported. Our results confirm that this optical technique permits the determination of the quality of the mechanical contact at the metal dielectric interface. This is of major importance for many applications, in particular because it modifiessignificantly the thermal conductivity at the nanoscale. Moreover, we observed that for two different synthesis routes, poor contact core−shell samples could sneak in among good sample series based on the same metallic core particles. This confirms the suitability of this all optical and noninvasive technique to obtain information hardly reachable by other means such as electron microscopy or absorption spectroscopy.
dc.description.sponsorshipDiagnostic d'Infections par spectroscopie Raman Amplifiée par Nanoparticules - ANR-11-NANB-0001
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.subject.enAcoustic vibrations
dc.subject.enNanoparticles
dc.title.enAcoustic Vibrations of Core–Shell Nanospheres: Probing the Mechanical Contact at the Metal–Dielectric Interface
dc.typeArticle de revue
dc.identifier.doi10.1021/acs.jpcc.7b12559
dc.subject.halChimie/Matériaux
dc.subject.halChimie/Chimie théorique et/ou physique
bordeaux.journalJournal of Physical Chemistry C
bordeaux.page9127-9133
bordeaux.volume122
bordeaux.issue16
bordeaux.peerReviewedoui
hal.identifierhal-01811071
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01811071v1
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