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dc.contributor.authorWen, Xiaomingen_US
dc.contributor.authorYu, Pyngen_US
dc.contributor.authorToh, Yon-Ruien_US
dc.contributor.authorTang, Jauen_US
dc.date.accessioned2014-12-08T15:29:28Z-
dc.date.available2014-12-08T15:29:28Z-
dc.date.issued2013-02-21en_US
dc.identifier.issn1932-7447en_US
dc.identifier.urihttp://dx.doi.org/10.1021/jp3116676en_US
dc.identifier.urihttp://hdl.handle.net/11536/21204-
dc.description.abstractThe quantum confined Stark effect is investigated for the first time in bovine serum albumin (BSA) protected Au-8 and Au-25 nanoclusters. We observed a red-shift of 63 meV in Au-8 nanoclusters upon an increase in pH from 2.14 to 12.0. Such behavior could be well explained in terms of the presence of a linear polar component and a quadratic polarizable component. In contrast, Au-25 nanoclusters exhibit more complicated Stark shifts due to their specific core/semiring structure. A plateau of the Stark shift was observed in both absorption and fluorescence, showing an offset of 30 meV. The lifetime measurements confirm that the plateau is due to the screening effect of the semirings in Au-25@BSA. Moreover, the dual fluorescent bands of Au-25 nanoclusters exhibit two different Stark shifts of 79 and 52 meV, respectively. The experimental data indicate that the Stark shift in both Au-8@BSA and Au-25@BSA has a significant linear polar component due to their asymmetric structure. This study suggests that gold nanoclusters can become a potentially useful candidate in probing local electric fields and also in pH-sensing in nanoscale environment of biological systems.en_US
dc.language.isoen_USen_US
dc.titleQuantum Confined Stark Effect in Au-8 and Au-25 Nanoclustersen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/jp3116676en_US
dc.identifier.journalJOURNAL OF PHYSICAL CHEMISTRY Cen_US
dc.citation.volume117en_US
dc.citation.issue7en_US
dc.citation.spage3621en_US
dc.citation.epage3626en_US
dc.contributor.department光電工程學系zh_TW
dc.contributor.departmentDepartment of Photonicsen_US
dc.identifier.wosnumberWOS:000315432100049-
dc.citation.woscount10-
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