Alloy formation of supported gold nanoparticles at their transition from clusters to solids: does size matter?
Identifieur interne : 002E71 ( Main/Exploration ); précédent : 002E70; suivant : 002E72Alloy formation of supported gold nanoparticles at their transition from clusters to solids: does size matter?
Auteurs : RBID : pubmed:15698114Abstract
Gold nanoclusters of a size approaching the molecular limit (<3 nm) were prepared on Si substrates in order to study alloy formation on the nanometer scale. For this purpose, indium atoms are deposited on top of the gold particles at room temperature and the formation of AuIn(2) is studied by x-ray photoelectron spectroscopy in situ. It is observed that the alloy formation takes place independent of whether the particles electronically are in an insulating molecular or in a metallic state. Most important, however, closed packed full-shell clusters containing 55 Au atoms are found to exhibit an outstanding stability against alloying despite a large negative heat of formation of the bulk Au-In system. Thus, Au(55) clusters may play a significant role in the design of nanoscaled devices where chemical inertness is of crucial importance.
PubMed: 15698114
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Alloy formation of supported gold nanoparticles at their transition from clusters to solids: does size matter?</title><author><name sortKey="Boyen, H G" uniqKey="Boyen H">H-G Boyen</name><affiliation wicri:level="3"><nlm:affiliation>Abteilung Festkörperphysik, Universität Ulm, D-89069 Ulm, Germany.</nlm:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Abteilung Festkörperphysik, Universität Ulm, D-89069 Ulm</wicri:regionArea><placeName><region type="land" nuts="1">Bade-Wurtemberg</region><region type="district" nuts="2">District de Tübingen</region><settlement type="city">Ulm</settlement></placeName></affiliation></author><author><name sortKey="Ethirajan, A" uniqKey="Ethirajan A">A Ethirajan</name></author><author><name sortKey="K Stle, G" uniqKey="K Stle G">G Kästle</name></author><author><name sortKey="Weigl, F" uniqKey="Weigl F">F Weigl</name></author><author><name sortKey="Ziemann, P" uniqKey="Ziemann P">P Ziemann</name></author><author><name sortKey="Schmid, G" uniqKey="Schmid G">G Schmid</name></author><author><name sortKey="Garnier, M G" uniqKey="Garnier M">M G Garnier</name></author><author><name sortKey="B Ttner, M" uniqKey="B Ttner M">M Büttner</name></author><author><name sortKey="Oelhafen, P" uniqKey="Oelhafen P">P Oelhafen</name></author></titleStmt><publicationStmt><date when="2005">2005</date><idno type="RBID">pubmed:15698114</idno><idno type="pmid">15698114</idno><idno type="wicri:Area/Main/Corpus">002F96</idno><idno type="wicri:Area/Main/Curation">002F96</idno><idno type="wicri:Area/Main/Exploration">002E71</idno></publicationStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Gold nanoclusters of a size approaching the molecular limit (<3 nm) were prepared on Si substrates in order to study alloy formation on the nanometer scale. For this purpose, indium atoms are deposited on top of the gold particles at room temperature and the formation of AuIn(2) is studied by x-ray photoelectron spectroscopy in situ. It is observed that the alloy formation takes place independent of whether the particles electronically are in an insulating molecular or in a metallic state. Most important, however, closed packed full-shell clusters containing 55 Au atoms are found to exhibit an outstanding stability against alloying despite a large negative heat of formation of the bulk Au-In system. Thus, Au(55) clusters may play a significant role in the design of nanoscaled devices where chemical inertness is of crucial importance.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="PubMed-not-MEDLINE"><PMID Version="1">15698114</PMID><DateCreated><Year>2005</Year><Month>02</Month><Day>08</Day></DateCreated><DateCompleted><Year>2005</Year><Month>04</Month><Day>22</Day></DateCompleted><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0031-9007</ISSN><JournalIssue CitedMedium="Print"><Volume>94</Volume><Issue>1</Issue><PubDate><Year>2005</Year><Month>Jan</Month><Day>14</Day></PubDate></JournalIssue><Title>Physical review letters</Title><ISOAbbreviation>Phys. Rev. Lett.</ISOAbbreviation></Journal><ArticleTitle>Alloy formation of supported gold nanoparticles at their transition from clusters to solids: does size matter?</ArticleTitle><Pagination><MedlinePgn>016804</MedlinePgn></Pagination><Abstract><AbstractText>Gold nanoclusters of a size approaching the molecular limit (<3 nm) were prepared on Si substrates in order to study alloy formation on the nanometer scale. For this purpose, indium atoms are deposited on top of the gold particles at room temperature and the formation of AuIn(2) is studied by x-ray photoelectron spectroscopy in situ. It is observed that the alloy formation takes place independent of whether the particles electronically are in an insulating molecular or in a metallic state. Most important, however, closed packed full-shell clusters containing 55 Au atoms are found to exhibit an outstanding stability against alloying despite a large negative heat of formation of the bulk Au-In system. Thus, Au(55) clusters may play a significant role in the design of nanoscaled devices where chemical inertness is of crucial importance.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Boyen</LastName><ForeName>H-G</ForeName><Initials>HG</Initials><Affiliation>Abteilung Festkörperphysik, Universität Ulm, D-89069 Ulm, Germany.</Affiliation></Author><Author ValidYN="Y"><LastName>Ethirajan</LastName><ForeName>A</ForeName><Initials>A</Initials></Author><Author ValidYN="Y"><LastName>Kästle</LastName><ForeName>G</ForeName><Initials>G</Initials></Author><Author ValidYN="Y"><LastName>Weigl</LastName><ForeName>F</ForeName><Initials>F</Initials></Author><Author ValidYN="Y"><LastName>Ziemann</LastName><ForeName>P</ForeName><Initials>P</Initials></Author><Author ValidYN="Y"><LastName>Schmid</LastName><ForeName>G</ForeName><Initials>G</Initials></Author><Author ValidYN="Y"><LastName>Garnier</LastName><ForeName>M G</ForeName><Initials>MG</Initials></Author><Author ValidYN="Y"><LastName>Büttner</LastName><ForeName>M</ForeName><Initials>M</Initials></Author><Author ValidYN="Y"><LastName>Oelhafen</LastName><ForeName>P</ForeName><Initials>P</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType>Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2005</Year><Month>01</Month><Day>05</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Phys Rev Lett</MedlineTA><NlmUniqueID>0401141</NlmUniqueID><ISSNLinking>0031-9007</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2004</Year><Month>October</Month><Day>14</Day></PubMedPubDate><PubMedPubDate PubStatus="aheadofprint"><Year>2005</Year><Month>January</Month><Day>5</Day></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2005</Year><Month>2</Month><Day>9</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2005</Year><Month>2</Month><Day>9</Day><Hour>9</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2005</Year><Month>2</Month><Day>9</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">15698114</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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