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dc.contributor.authorPu, Ying-Chihen_US
dc.contributor.authorWang, Gongmingen_US
dc.contributor.authorChang, Kao-Deren_US
dc.contributor.authorLing, Yichuanen_US
dc.contributor.authorLin, Yin-Kaien_US
dc.contributor.authorFitzmorris, Bob C.en_US
dc.contributor.authorLiu, Chia-Mingen_US
dc.contributor.authorLu, Xihongen_US
dc.contributor.authorTong, Yexiangen_US
dc.contributor.authorZhang, Jin Z.en_US
dc.contributor.authorHsu, Yung-Jungen_US
dc.contributor.authorLi, Yaten_US
dc.date.accessioned2014-12-08T15:32:03Z-
dc.date.available2014-12-08T15:32:03Z-
dc.date.issued2013-08-01en_US
dc.identifier.issn1530-6984en_US
dc.identifier.urihttp://dx.doi.org/10.1021/nl4018385en_US
dc.identifier.urihttp://hdl.handle.net/11536/22593-
dc.description.abstractHere we demonstrate that the photoactivity of Au-decorated TiO2 electrodes for photoelectrochemical water oxidation can be effectively enhanced in the entire UV-visible region from 300 to 800 nm by manipulating the shape of the decorated Au nanostructures. The samples were prepared by carefully depositing Au nanoparticles (NPs), Au nanorods (NRs), and a mixture of Au NPs and NRs on the surface of TiO2 nanowire arrays. As compared with bare TiO2, Au NP-decorated TiO2 nanowire electrodes exhibited significantly enhanced photoactivity in both the UV and visible regions. For Au NR-decorated TiO2 electrodes, the photoactivity enhancement was, however, observed in the visible region only, with the largest photocurrent generation achieved at 710 nm. Significantly, TiO2 nanowires deposited with a mixture of Au NPs and NRs showed enhanced photoactivity in the entire UV visible region. Monochromatic incident photon-to-electron conversion efficiency measurements indicated that excitation of surface plasmon resonance of Au is responsible for the enhanced photoactivity of Au nanostructure-decorated TiO2 nanowires. Photovoltage experiment showed that the enhanced photoactivity of Au NP-decorated TiO2 in the UV region was attributable to the effective surface passivation of Au NPs. Furthermore, 3D finite-difference time domain simulation was performed to investigate the electrical field amplification at the interface between Au nanostructures and TiO2 upon SPR excitation. The results suggested that the enhanced photoactivity of Au NP-decorated TiO2 in the UV region was partially due to the increased optical absorption of TiO2 associated with SPR electrical field amplification. The current study could provide a new paradigm for designing plasmonic metal/semiconductor composite systems to effectively harvest the entire UV visible light for solar fuel production.en_US
dc.language.isoen_USen_US
dc.subjectPhotoelectrochemical water splittingen_US
dc.subjectplasmonic enhancementen_US
dc.subjecttunable absorption wavelengthen_US
dc.subjectsolar fuel productionen_US
dc.subjectAuen_US
dc.subjectTiO2en_US
dc.titleAu Nanostructure-Decorated TiO2 Nanowires Exhibiting Photoactivity Across Entire UV-visible Region for Photoelectrochemical Water Splittingen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/nl4018385en_US
dc.identifier.journalNANO LETTERSen_US
dc.citation.volume13en_US
dc.citation.issue8en_US
dc.citation.spage3817en_US
dc.citation.epage3823en_US
dc.contributor.department材料科學與工程學系zh_TW
dc.contributor.departmentDepartment of Materials Science and Engineeringen_US
dc.identifier.wosnumberWOS:000323241000059-
dc.citation.woscount78-
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