Please use this identifier to cite or link to this item: https://doi.org/10.1021/nn102581g
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dc.titleHypersonic vibrations of Ag@SiO2 (cubic core)-shell nanospheres
dc.contributor.authorSun, J.Y.
dc.contributor.authorWang, Z.K.
dc.contributor.authorLim, H.S.
dc.contributor.authorNg, S.C.
dc.contributor.authorKuok, M.H.
dc.contributor.authorTran, T.T.
dc.contributor.authorLu, X.
dc.date.accessioned2014-10-09T06:50:34Z
dc.date.available2014-10-09T06:50:34Z
dc.date.issued2010-12-28
dc.identifier.citationSun, J.Y., Wang, Z.K., Lim, H.S., Ng, S.C., Kuok, M.H., Tran, T.T., Lu, X. (2010-12-28). Hypersonic vibrations of Ag@SiO2 (cubic core)-shell nanospheres. ACS Nano 4 (12) : 7692-7698. ScholarBank@NUS Repository. https://doi.org/10.1021/nn102581g
dc.identifier.issn19360851
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/89156
dc.description.abstractThe intriguing optical and catalytic properties of metal-silica core-shell nanoparticles, inherited from their plasmonic metallic cores together with the rich surface chemistry and increased stability offered by their silica shells, have enabled a wide variety of applications. In this work, we investigate the confined vibrational modes of a series of monodisperse Ag@SiO2 (cubic core)-shell nanospheres synthesized using a modified Stöber sol-gel method. The particle-size dependence of their mode frequencies has been mapped by Brillouin light scattering, a powerful tool for probing hypersonic vibrations. Unlike the larger particles, the observed spheroidal-like mode frequencies of the smaller ones do not scale with inverse diameter. Interestingly, the onset of the deviation from this linearity occurs at a smaller particle size for higher-energy modes than for lower-energy ones. Finite element simulations show that the mode displacement profiles of the Ag@SiO 2 core-shells closely resemble those of a homogeneous SiO2 sphere. Simulations have also been performed to ascertain the effects that the core shape and the relative hardness of the core and shell materials have on the vibrations of the core-shell as a whole. As the vibrational modes of a particle have a bearing on its thermal and mechanical properties, the findings would be of value in designing core-shell nanostructures with customized thermal and mechanical characteristics. © 2010 American Chemical Society.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1021/nn102581g
dc.sourceScopus
dc.subjectBrillouin light scattering
dc.subjectcore-shells
dc.subjectfinite element simulations
dc.subjectmode displacement profiles
dc.subjectvibrational modes
dc.typeArticle
dc.contributor.departmentCHEMICAL & BIOMOLECULAR ENGINEERING
dc.contributor.departmentPHYSICS
dc.description.doi10.1021/nn102581g
dc.description.sourcetitleACS Nano
dc.description.volume4
dc.description.issue12
dc.description.page7692-7698
dc.identifier.isiut000285449100082
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