Plasmon spectroscopy of small indium-silver clusters: monitoring the indium shell oxidation.
Identifieur interne : 000084 ( Main/Exploration ); précédent : 000083; suivant : 000085Plasmon spectroscopy of small indium-silver clusters: monitoring the indium shell oxidation.
Auteurs : RBID : pubmed:24531859Abstract
Owing to the very different electrovalences of indium and silver, nanoparticles made of these elements are among the simplest examples of hybrid plasmonic systems retaining a full metallic character. The optical properties of small indium-silver clusters are investigated here for the first time in relation to their structural characterization. They are produced in the gas phase by a laser vaporization source and co-deposited in a silica matrix. The optical absorption of fresh samples is dominated by a strong surface plasmon resonance (SPR) in the near UV, in an intermediate position between those of pure elements. A combination of SPR analysis and electron microscopy imaging provides evidence for the favourable surface segregation of indium. After a prolonged exposure to ambient air and because of the silica matrix porosity, changes in the SPR reflect the spontaneous formation of a dielectric indium oxide shell around a metallic silver core. The metallic character of indium can nevertheless be recovered by annealing under a reducing atmosphere. The reversibility of these processes is directly mirrored in optical measurements through SPR shifts and broadenings as supported by multi-shell Mie theory calculations. By controlling their oxidation level, In-Ag clusters can be considered as new candidates to extend SPR spectroscopy in the UV range and model plasmonic systems consisting of a silver particle of potentially very small size, fully protected by a dielectric oxide shell.
DOI: 10.1039/c3cp55135k
PubMed: 24531859
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The optical properties of small indium-silver clusters are investigated here for the first time in relation to their structural characterization. They are produced in the gas phase by a laser vaporization source and co-deposited in a silica matrix. The optical absorption of fresh samples is dominated by a strong surface plasmon resonance (SPR) in the near UV, in an intermediate position between those of pure elements. A combination of SPR analysis and electron microscopy imaging provides evidence for the favourable surface segregation of indium. After a prolonged exposure to ambient air and because of the silica matrix porosity, changes in the SPR reflect the spontaneous formation of a dielectric indium oxide shell around a metallic silver core. The metallic character of indium can nevertheless be recovered by annealing under a reducing atmosphere. The reversibility of these processes is directly mirrored in optical measurements through SPR shifts and broadenings as supported by multi-shell Mie theory calculations. By controlling their oxidation level, In-Ag clusters can be considered as new candidates to extend SPR spectroscopy in the UV range and model plasmonic systems consisting of a silver particle of potentially very small size, fully protected by a dielectric oxide shell.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="In-Process"><PMID Version="1">24531859</PMID><DateCreated><Year>2014</Year><Month>02</Month><Day>26</Day></DateCreated><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1463-9084</ISSN><JournalIssue CitedMedium="Internet"><Volume>16</Volume><Issue>12</Issue><PubDate><Year>2014</Year><Month>Mar</Month><Day>28</Day></PubDate></JournalIssue><Title>Physical chemistry chemical physics : PCCP</Title><ISOAbbreviation>Phys Chem Chem Phys</ISOAbbreviation></Journal><ArticleTitle>Plasmon spectroscopy of small indium-silver clusters: monitoring the indium shell oxidation.</ArticleTitle><Pagination><MedlinePgn>5763-73</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1039/c3cp55135k</ELocationID><Abstract><AbstractText>Owing to the very different electrovalences of indium and silver, nanoparticles made of these elements are among the simplest examples of hybrid plasmonic systems retaining a full metallic character. The optical properties of small indium-silver clusters are investigated here for the first time in relation to their structural characterization. They are produced in the gas phase by a laser vaporization source and co-deposited in a silica matrix. The optical absorption of fresh samples is dominated by a strong surface plasmon resonance (SPR) in the near UV, in an intermediate position between those of pure elements. A combination of SPR analysis and electron microscopy imaging provides evidence for the favourable surface segregation of indium. After a prolonged exposure to ambient air and because of the silica matrix porosity, changes in the SPR reflect the spontaneous formation of a dielectric indium oxide shell around a metallic silver core. The metallic character of indium can nevertheless be recovered by annealing under a reducing atmosphere. The reversibility of these processes is directly mirrored in optical measurements through SPR shifts and broadenings as supported by multi-shell Mie theory calculations. By controlling their oxidation level, In-Ag clusters can be considered as new candidates to extend SPR spectroscopy in the UV range and model plasmonic systems consisting of a silver particle of potentially very small size, fully protected by a dielectric oxide shell.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Cottancin</LastName><ForeName>Emmanuel</ForeName><Initials>E</Initials><Affiliation>Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne Cedex, France. michel.pellarin@univ-lyon1.fr.</Affiliation></Author><Author ValidYN="Y"><LastName>Langlois</LastName><ForeName>Cyril</ForeName><Initials>C</Initials></Author><Author ValidYN="Y"><LastName>Lermé</LastName><ForeName>Jean</ForeName><Initials>J</Initials></Author><Author ValidYN="Y"><LastName>Broyer</LastName><ForeName>Michel</ForeName><Initials>M</Initials></Author><Author ValidYN="Y"><LastName>Lebeault</LastName><ForeName>Marie-Ange</ForeName><Initials>MA</Initials></Author><Author ValidYN="Y"><LastName>Pellarin</LastName><ForeName>Michel</ForeName><Initials>M</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType>Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2014</Year><Month>02</Month><Day>17</Day></ArticleDate></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>Phys Chem Chem Phys</MedlineTA><NlmUniqueID>100888160</NlmUniqueID><ISSNLinking>1463-9076</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="aheadofprint"><Year>2014</Year><Month>2</Month><Day>17</Day></PubMedPubDate><PubMedPubDate PubStatus="epublish"><Year>2014</Year><Month>2</Month><Day>26</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2014</Year><Month>2</Month><Day>18</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2014</Year><Month>2</Month><Day>18</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2014</Year><Month>2</Month><Day>18</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="doi">10.1039/c3cp55135k</ArticleId><ArticleId IdType="pubmed">24531859</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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