Ultrafast dynamics of photogenerated electrons in CdS nanocluster multilayers assembled on solid substrates: effects of assembly and electrode potential.
Identifieur interne : 000297 ( Main/Exploration ); précédent : 000296; suivant : 000298Ultrafast dynamics of photogenerated electrons in CdS nanocluster multilayers assembled on solid substrates: effects of assembly and electrode potential.
Auteurs : RBID : pubmed:23843228Abstract
The ultrafast dynamics of photogenerated electrons in multilayer assemblies of CdS nanoparticles prepared on quartz and indium-tin oxide (ITO) substrates were followed by femtosecond (fs) visible-pump/mid-IR probe spectroscopy. Based on the observation of the photoinduced transient absorption spectra in the broad mid-IR range at the multilayer assembly of CdS nanoparticles, the occupation and fast relaxation of higher electronic states (1P(e)) were clarified. As compared with the electron dynamics of isolated (dispersed in solution) nanoparticles, the decay of photoexcited electrons in the multilayer assembly was clearly accelerated probably due to both electron hopping and scattering during interparticle electron tunneling. By using an ITO electrode as a substrate, the effect of the electric field on the photoelectron dynamics in the multilayer assembly was also investigated in situ. Both the amplitude and lifetime of photoexcited electrons gradually reduced as the potential became more positive. This result was explained by considering the reduction of the interparticle tunneling probability and the increase in the electron-transfer rate from the CdS nanoparticle assembly to the ITO electrode.
DOI: 10.1002/cphc.201300427
PubMed: 23843228
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Ultrafast dynamics of photogenerated electrons in CdS nanocluster multilayers assembled on solid substrates: effects of assembly and electrode potential.</title><author><name sortKey="Yagi, Ichizo" uniqKey="Yagi I">Ichizo Yagi</name><affiliation wicri:level="1"><nlm:affiliation>Division of Chemistry, Graduate School of Science, Hokkaido University, N10W8 Kita-ku, Sapporo 060-0810, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Division of Chemistry, Graduate School of Science, Hokkaido University, N10W8 Kita-ku, Sapporo 060-0810</wicri:regionArea></affiliation></author><author><name sortKey="Mikami, Kensuke" uniqKey="Mikami K">Kensuke Mikami</name></author><author><name sortKey="Okamura, Masayuki" uniqKey="Okamura M">Masayuki Okamura</name></author><author><name sortKey="Uosaki, Kohei" uniqKey="Uosaki K">Kohei Uosaki</name></author></titleStmt><publicationStmt><date when="2013">2013</date><idno type="RBID">pubmed:23843228</idno><idno type="pmid">23843228</idno><idno type="doi">10.1002/cphc.201300427</idno><idno type="wicri:Area/Main/Corpus">000529</idno><idno type="wicri:Area/Main/Curation">000529</idno><idno type="wicri:Area/Main/Exploration">000297</idno></publicationStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The ultrafast dynamics of photogenerated electrons in multilayer assemblies of CdS nanoparticles prepared on quartz and indium-tin oxide (ITO) substrates were followed by femtosecond (fs) visible-pump/mid-IR probe spectroscopy. Based on the observation of the photoinduced transient absorption spectra in the broad mid-IR range at the multilayer assembly of CdS nanoparticles, the occupation and fast relaxation of higher electronic states (1P(e)) were clarified. As compared with the electron dynamics of isolated (dispersed in solution) nanoparticles, the decay of photoexcited electrons in the multilayer assembly was clearly accelerated probably due to both electron hopping and scattering during interparticle electron tunneling. By using an ITO electrode as a substrate, the effect of the electric field on the photoelectron dynamics in the multilayer assembly was also investigated in situ. Both the amplitude and lifetime of photoexcited electrons gradually reduced as the potential became more positive. This result was explained by considering the reduction of the interparticle tunneling probability and the increase in the electron-transfer rate from the CdS nanoparticle assembly to the ITO electrode.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="PubMed-not-MEDLINE"><PMID Version="1">23843228</PMID><DateCreated><Year>2013</Year><Month>07</Month><Day>29</Day></DateCreated><DateCompleted><Year>2014</Year><Month>02</Month><Day>18</Day></DateCompleted><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1439-7641</ISSN><JournalIssue CitedMedium="Internet"><Volume>14</Volume><Issue>10</Issue><PubDate><Year>2013</Year><Month>Jul</Month><Day>22</Day></PubDate></JournalIssue><Title>Chemphyschem : a European journal of chemical physics and physical chemistry</Title><ISOAbbreviation>Chemphyschem</ISOAbbreviation></Journal><ArticleTitle>Ultrafast dynamics of photogenerated electrons in CdS nanocluster multilayers assembled on solid substrates: effects of assembly and electrode potential.</ArticleTitle><Pagination><MedlinePgn>2174-82</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1002/cphc.201300427</ELocationID><Abstract><AbstractText>The ultrafast dynamics of photogenerated electrons in multilayer assemblies of CdS nanoparticles prepared on quartz and indium-tin oxide (ITO) substrates were followed by femtosecond (fs) visible-pump/mid-IR probe spectroscopy. Based on the observation of the photoinduced transient absorption spectra in the broad mid-IR range at the multilayer assembly of CdS nanoparticles, the occupation and fast relaxation of higher electronic states (1P(e)) were clarified. As compared with the electron dynamics of isolated (dispersed in solution) nanoparticles, the decay of photoexcited electrons in the multilayer assembly was clearly accelerated probably due to both electron hopping and scattering during interparticle electron tunneling. By using an ITO electrode as a substrate, the effect of the electric field on the photoelectron dynamics in the multilayer assembly was also investigated in situ. Both the amplitude and lifetime of photoexcited electrons gradually reduced as the potential became more positive. This result was explained by considering the reduction of the interparticle tunneling probability and the increase in the electron-transfer rate from the CdS nanoparticle assembly to the ITO electrode.</AbstractText><CopyrightInformation>Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Yagi</LastName><ForeName>Ichizo</ForeName><Initials>I</Initials><Affiliation>Division of Chemistry, Graduate School of Science, Hokkaido University, N10W8 Kita-ku, Sapporo 060-0810, Japan.</Affiliation></Author><Author ValidYN="Y"><LastName>Mikami</LastName><ForeName>Kensuke</ForeName><Initials>K</Initials></Author><Author ValidYN="Y"><LastName>Okamura</LastName><ForeName>Masayuki</ForeName><Initials>M</Initials></Author><Author ValidYN="Y"><LastName>Uosaki</LastName><ForeName>Kohei</ForeName><Initials>K</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType>Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2013</Year><Month>07</Month><Day>10</Day></ArticleDate></Article><MedlineJournalInfo><Country>Germany</Country><MedlineTA>Chemphyschem</MedlineTA><NlmUniqueID>100954211</NlmUniqueID><ISSNLinking>1439-4235</ISSNLinking></MedlineJournalInfo><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">IR spectroscopy</Keyword><Keyword MajorTopicYN="N">photoelectrochemistry</Keyword><Keyword MajorTopicYN="N">quantum dots</Keyword><Keyword MajorTopicYN="N">semiconductors</Keyword><Keyword MajorTopicYN="N">ultrafast dynamics</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2013</Year><Month>4</Month><Day>30</Day></PubMedPubDate><PubMedPubDate PubStatus="aheadofprint"><Year>2013</Year><Month>7</Month><Day>10</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2013</Year><Month>7</Month><Day>12</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2013</Year><Month>7</Month><Day>12</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2013</Year><Month>7</Month><Day>12</Day><Hour>6</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">23843228</ArticleId><ArticleId IdType="doi">10.1002/cphc.201300427</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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