Plasmonic enhanced emissions from cubic NaYF(4):Yb: Er/Tm nanophosphors.
Identifieur interne : 000414 ( PubMed/Checkpoint ); précédent : 000413; suivant : 000415Plasmonic enhanced emissions from cubic NaYF(4):Yb: Er/Tm nanophosphors.
Auteurs : L. Sudheendra [États-Unis] ; Volkan Ortalan ; Sanchita Dey ; Nigel D. Browning ; I M KennedySource :
- Chemistry of materials : a publication of the American Chemical Society [ 0897-4756 ] ; 2011.
Abstract
A metal shell was used in this study to provide significant enhancement of the up-converted emission from cubic NaYF(4) nanoparticles, creating a valuable composite material for labeling in biology and other applications - use of the cubic form of the material obviates the need to undertake a high temperature transformation to the naturally more efficient hexagonal phase. The NaYF(4) matrix contained ytterbium sensitizer and an Erbium (Er) or Thulium (Tm) activator. The particle sizes of the as-synthesized nanoparticles were in the range of 20-40 nm with a gold shell thickness of 4-8 nm. The gold shell was macroscopically amorphous. The synthesis method was based on a citrate chelation. In this approach, we exploited the ability of the citrate ion to act as a reductant and stabilizer. Confining the citrate ion reductant on the nanophosphor surface rather than in the solution was critical to the gold shell formation. The plasmonic shell enhanced the up-conversion emission of Tm from visible and near-infrared regions by up to a factor of 8, in addition to imparting a visible color arising from the plasmon absorption of the gold shell. The up-conversion enhancement observed with Tm and Er were different for similar gold coverages, with local crystal field changes as a possible route to enhance up-conversion emission from high symmetry structural hosts. These novel up-converting nanophosphor particles combine the phosphor and features of a gold shell, providing a unique platform for many biological imaging and labeling applications.
DOI: 10.1021/cm2006814
PubMed: 21709812
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Sudheendra</name><affiliation wicri:level="1"><nlm:affiliation>Mechanical and Aerospace Engineering Department, University of California, Davis, 95616, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Mechanical and Aerospace Engineering Department, University of California, Davis, 95616</wicri:regionArea><wicri:noRegion>95616</wicri:noRegion></affiliation></author><author><name sortKey="Ortalan, Volkan" sort="Ortalan, Volkan" uniqKey="Ortalan V" first="Volkan" last="Ortalan">Volkan Ortalan</name></author><author><name sortKey="Dey, Sanchita" sort="Dey, Sanchita" uniqKey="Dey S" first="Sanchita" last="Dey">Sanchita Dey</name></author><author><name sortKey="Browning, Nigel D" sort="Browning, Nigel D" uniqKey="Browning N" first="Nigel D" last="Browning">Nigel D. Browning</name></author><author><name sortKey="Kennedy, I M" sort="Kennedy, I M" uniqKey="Kennedy I" first="I M" last="Kennedy">I M Kennedy</name></author></analytic><series><title level="j">Chemistry of materials : a publication of the American Chemical Society</title><idno type="ISSN">0897-4756</idno><imprint><date when="2011" type="published">2011</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A metal shell was used in this study to provide significant enhancement of the up-converted emission from cubic NaYF(4) nanoparticles, creating a valuable composite material for labeling in biology and other applications - use of the cubic form of the material obviates the need to undertake a high temperature transformation to the naturally more efficient hexagonal phase. The NaYF(4) matrix contained ytterbium sensitizer and an Erbium (Er) or Thulium (Tm) activator. The particle sizes of the as-synthesized nanoparticles were in the range of 20-40 nm with a gold shell thickness of 4-8 nm. The gold shell was macroscopically amorphous. The synthesis method was based on a citrate chelation. In this approach, we exploited the ability of the citrate ion to act as a reductant and stabilizer. Confining the citrate ion reductant on the nanophosphor surface rather than in the solution was critical to the gold shell formation. The plasmonic shell enhanced the up-conversion emission of Tm from visible and near-infrared regions by up to a factor of 8, in addition to imparting a visible color arising from the plasmon absorption of the gold shell. The up-conversion enhancement observed with Tm and Er were different for similar gold coverages, with local crystal field changes as a possible route to enhance up-conversion emission from high symmetry structural hosts. These novel up-converting nanophosphor particles combine the phosphor and features of a gold shell, providing a unique platform for many biological imaging and labeling applications.</div></front></TEI><pubmed><MedlineCitation Status="Publisher" Owner="NLM"><PMID Version="1">21709812</PMID><DateCreated><Year>2011</Year><Month>8</Month><Day>5</Day></DateCreated><Article PubModel="Print"><Journal><ISSN IssnType="Print">0897-4756</ISSN><JournalIssue CitedMedium="Print"><Volume>23</Volume><Issue>11</Issue><PubDate><Year>2011</Year><Month>Jun</Month><Day>14</Day></PubDate></JournalIssue><Title>Chemistry of materials : a publication of the American Chemical Society</Title><ISOAbbreviation>Chem Mater</ISOAbbreviation></Journal><ArticleTitle>Plasmonic enhanced emissions from cubic NaYF(4):Yb: Er/Tm nanophosphors.</ArticleTitle><Pagination><MedlinePgn>2987-2993</MedlinePgn></Pagination><Abstract><AbstractText>A metal shell was used in this study to provide significant enhancement of the up-converted emission from cubic NaYF(4) nanoparticles, creating a valuable composite material for labeling in biology and other applications - use of the cubic form of the material obviates the need to undertake a high temperature transformation to the naturally more efficient hexagonal phase. The NaYF(4) matrix contained ytterbium sensitizer and an Erbium (Er) or Thulium (Tm) activator. The particle sizes of the as-synthesized nanoparticles were in the range of 20-40 nm with a gold shell thickness of 4-8 nm. The gold shell was macroscopically amorphous. The synthesis method was based on a citrate chelation. In this approach, we exploited the ability of the citrate ion to act as a reductant and stabilizer. Confining the citrate ion reductant on the nanophosphor surface rather than in the solution was critical to the gold shell formation. The plasmonic shell enhanced the up-conversion emission of Tm from visible and near-infrared regions by up to a factor of 8, in addition to imparting a visible color arising from the plasmon absorption of the gold shell. The up-conversion enhancement observed with Tm and Er were different for similar gold coverages, with local crystal field changes as a possible route to enhance up-conversion emission from high symmetry structural hosts. These novel up-converting nanophosphor particles combine the phosphor and features of a gold shell, providing a unique platform for many biological imaging and labeling applications.</AbstractText></Abstract><AuthorList><Author><LastName>Sudheendra</LastName><ForeName>L</ForeName><Initials>L</Initials><AffiliationInfo><Affiliation>Mechanical and Aerospace Engineering Department, University of California, Davis, 95616, USA.</Affiliation></AffiliationInfo></Author><Author><LastName>Ortalan</LastName><ForeName>Volkan</ForeName><Initials>V</Initials></Author><Author><LastName>Dey</LastName><ForeName>Sanchita</ForeName><Initials>S</Initials></Author><Author><LastName>Browning</LastName><ForeName>Nigel D</ForeName><Initials>ND</Initials></Author><Author><LastName>Kennedy</LastName><ForeName>I M</ForeName><Initials>IM</Initials></Author></AuthorList><Language>ENG</Language><GrantList><Grant><GrantID>P42 ES004699</GrantID><Acronym>ES</Acronym><Agency>NIEHS NIH HHS</Agency><Country>United States</Country></Grant><Grant><GrantID>P42 ES004699-24</GrantID><Acronym>ES</Acronym><Agency>NIEHS NIH HHS</Agency><Country>United States</Country></Grant></GrantList><PublicationTypeList><PublicationType UI="">JOURNAL ARTICLE</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><MedlineTA>Chem Mater</MedlineTA><NlmUniqueID>9884133</NlmUniqueID><ISSNLinking>0897-4756</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="entrez"><Year>2011</Year><Month>6</Month><Day>29</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2011</Year><Month>6</Month><Day>29</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2011</Year><Month>6</Month><Day>29</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="doi">10.1021/cm2006814</ArticleId><ArticleId IdType="pubmed">21709812</ArticleId><ArticleId IdType="pmc">PMC3119558</ArticleId><ArticleId IdType="mid">NIHMS298153</ArticleId></ArticleIdList><pmc-dir>nihms</pmc-dir>
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