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dc.contributor.authorWerner, Danielen_US
dc.contributor.authorHashimoto, Shuichien_US
dc.contributor.authorUwada, Takayukien_US
dc.date.accessioned2014-12-08T15:06:42Z-
dc.date.available2014-12-08T15:06:42Z-
dc.date.issued2010-06-15en_US
dc.identifier.issn0743-7463en_US
dc.identifier.urihttp://dx.doi.org/10.1021/la100015ten_US
dc.identifier.urihttp://hdl.handle.net/11536/5260-
dc.description.abstractAn in situ spectroscopic study of the nanosecond laser-induced melting and size reduction of pseudospherical gold nanoparticles with 54 +/- 7 nm diameter allowed the observation of a heating efficiency that was very dependent on the excitation wavelength. A remarkably greater efficiency was observed for the photothermal effect of interband excitation than that of intraband excitation. This noteworthy observation is ascribed to an altered electron heat capacity, c(e), during photoexcitation depending on the excitation energy, which is a phenomenon that has not been realized previously. As a result, a 60% reduction of the specific heat capacity, c(p), compared to that of bulk gold was obtained for interband excitation at 266 nm whereas the c(p) value for the excitation of the intraband transition at 532 nm was unaltered. A semiquantitative explanation was given for this striking phenomenon induced by interband excitation in which excitation relaxation cycles of electrons upon excitation of 5d electrons to the 6sp band lead to a reduced number of electrons contributing to the electron temperature rise in the vicinity of the Fermi level during the nanosecond laser pulse duration. By contrast, electronic-excitation within the 6sp band results in no net reduction in the number of electrons near the Fermi level, giving rise to a value of c(p) similar to that of bulk gold. Our finding that the heat capacity of gold nanoparticles can be changed upon UV laser excitation is important for understanding the fundamental nature of noble metal nanoparticles. Furthermore, this finding might be useful for preparing new metal alloy particles as well as for manipulating the thermodynamic properties of the nanoparticles.en_US
dc.language.isoen_USen_US
dc.titleRemarkable Photothermal Effect of Interband Excitation on Nanosecond Laser-Induced Reshaping and Size Reduction of Pseudospherical Gold Nanoparticles in Aqueous Solutionen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/la100015ten_US
dc.identifier.journalLANGMUIRen_US
dc.citation.volume26en_US
dc.citation.issue12en_US
dc.citation.spage9956en_US
dc.citation.epage9963en_US
dc.contributor.department應用化學系zh_TW
dc.contributor.department應用化學系分子科學碩博班zh_TW
dc.contributor.departmentDepartment of Applied Chemistryen_US
dc.contributor.departmentInstitute of Molecular scienceen_US
dc.identifier.wosnumberWOS:000278427600106-
dc.citation.woscount27-
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