Surface chemistry of InP quantum dots: a comprehensive study.
Identifieur interne : 001723 ( Main/Exploration ); précédent : 001722; suivant : 001724Surface chemistry of InP quantum dots: a comprehensive study.
Auteurs : RBID : pubmed:21126088Abstract
Advanced (1)H, (13)C, and (31)P solution and solid-state NMR studies combined with IR spectroscopy were used to probe, at the molecular scale, the composition and the surface chemistry of indium phosphide (InP) quantum dots (QDs) prepared via a non-coordinating solvent strategy. This nanomaterial can be described as a core-multishell object: an InP core, with a zinc blende bulk structure, is surrounded first by a partially oxidized surface shell, which is itself surrounded by an organic coating. This organic passivating layer is composed, in the first coordination sphere, of tightly bound palmitate ligands which display two different bonding modes. A second coordination sphere includes an unexpected dialkyl ketone and residual long-chain non-coordinating solvents (ODE and its isomers) which interact through weak intermolecular bonds with the alkyl chains of the carboxylate ligands. We show that this ketone is formed during the synthesis process via a decarboxylative coupling route and provides oxidative conditions which are responsible for the oxidation of the InP core surface. This phenomenon has a significant impact on the photoluminescence properties of the as-synthesized QDs and probably accounts for the failure of further growth of the InP core.
DOI: 10.1021/ja104673y
PubMed: 21126088
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This nanomaterial can be described as a core-multishell object: an InP core, with a zinc blende bulk structure, is surrounded first by a partially oxidized surface shell, which is itself surrounded by an organic coating. This organic passivating layer is composed, in the first coordination sphere, of tightly bound palmitate ligands which display two different bonding modes. A second coordination sphere includes an unexpected dialkyl ketone and residual long-chain non-coordinating solvents (ODE and its isomers) which interact through weak intermolecular bonds with the alkyl chains of the carboxylate ligands. We show that this ketone is formed during the synthesis process via a decarboxylative coupling route and provides oxidative conditions which are responsible for the oxidation of the InP core surface. This phenomenon has a significant impact on the photoluminescence properties of the as-synthesized QDs and probably accounts for the failure of further growth of the InP core.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="PubMed-not-MEDLINE"><PMID Version="1">21126088</PMID><DateCreated><Year>2010</Year><Month>12</Month><Day>23</Day></DateCreated><DateCompleted><Year>2011</Year><Month>04</Month><Day>29</Day></DateCompleted><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1520-5126</ISSN><JournalIssue CitedMedium="Internet"><Volume>132</Volume><Issue>51</Issue><PubDate><Year>2010</Year><Month>Dec</Month><Day>29</Day></PubDate></JournalIssue><Title>Journal of the American Chemical Society</Title><ISOAbbreviation>J. Am. Chem. Soc.</ISOAbbreviation></Journal><ArticleTitle>Surface chemistry of InP quantum dots: a comprehensive study.</ArticleTitle><Pagination><MedlinePgn>18147-57</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1021/ja104673y</ELocationID><Abstract><AbstractText>Advanced (1)H, (13)C, and (31)P solution and solid-state NMR studies combined with IR spectroscopy were used to probe, at the molecular scale, the composition and the surface chemistry of indium phosphide (InP) quantum dots (QDs) prepared via a non-coordinating solvent strategy. This nanomaterial can be described as a core-multishell object: an InP core, with a zinc blende bulk structure, is surrounded first by a partially oxidized surface shell, which is itself surrounded by an organic coating. This organic passivating layer is composed, in the first coordination sphere, of tightly bound palmitate ligands which display two different bonding modes. A second coordination sphere includes an unexpected dialkyl ketone and residual long-chain non-coordinating solvents (ODE and its isomers) which interact through weak intermolecular bonds with the alkyl chains of the carboxylate ligands. We show that this ketone is formed during the synthesis process via a decarboxylative coupling route and provides oxidative conditions which are responsible for the oxidation of the InP core surface. This phenomenon has a significant impact on the photoluminescence properties of the as-synthesized QDs and probably accounts for the failure of further growth of the InP core.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Cros-Gagneux</LastName><ForeName>Arnaud</ForeName><Initials>A</Initials><Affiliation>Université de Toulouse, INSA, UPS, CNRS, LPCNO (Laboratoire de Physique et Chimie des Nano-Objets), 135 avenue de Rangueil, F-31077 Toulouse, France.</Affiliation></Author><Author ValidYN="Y"><LastName>Delpech</LastName><ForeName>Fabien</ForeName><Initials>F</Initials></Author><Author ValidYN="Y"><LastName>Nayral</LastName><ForeName>Céline</ForeName><Initials>C</Initials></Author><Author ValidYN="Y"><LastName>Cornejo</LastName><ForeName>Alfonso</ForeName><Initials>A</Initials></Author><Author ValidYN="Y"><LastName>Coppel</LastName><ForeName>Yannick</ForeName><Initials>Y</Initials></Author><Author ValidYN="Y"><LastName>Chaudret</LastName><ForeName>Bruno</ForeName><Initials>B</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType>Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2010</Year><Month>12</Month><Day>02</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>J Am Chem Soc</MedlineTA><NlmUniqueID>7503056</NlmUniqueID><ISSNLinking>0002-7863</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="aheadofprint"><Year>2010</Year><Month>12</Month><Day>2</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2010</Year><Month>12</Month><Day>4</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2010</Year><Month>12</Month><Day>4</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2010</Year><Month>12</Month><Day>4</Day><Hour>6</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="doi">10.1021/ja104673y</ArticleId><ArticleId IdType="pubmed">21126088</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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