Aqueous phase transfer of InP/ZnS nanocrystals conserving fluorescence and high colloidal stability.
Identifieur interne : 001590 ( Main/Exploration ); précédent : 001589; suivant : 001591Aqueous phase transfer of InP/ZnS nanocrystals conserving fluorescence and high colloidal stability.
Auteurs : RBID : pubmed:22035355English descriptors
- KwdEn :
- Colloids (chemistry), Crystallization (methods), Fluorescence, Indium (chemistry), Luminescent Measurements (methods), Materials Testing, Nanostructures (chemistry), Nanostructures (ultrastructure), Particle Size, Phase Transition, Phosphines (chemistry), Quantum Dots, Selenium Compounds (chemistry), Water (chemistry), Zinc Compounds (chemistry).
- MESH :
- chemical , chemistry : Colloids, Indium, Phosphines, Selenium Compounds, Water, Zinc Compounds.
- chemistry : Nanostructures.
- methods : Crystallization, Luminescent Measurements.
- ultrastructure : Nanostructures.
- Fluorescence, Materials Testing, Particle Size, Phase Transition, Quantum Dots.
Abstract
Small thiol-containing amino acids such as cysteine are appealing surface ligands for transferring semiconductor quantum dots (QDs) from organic solvents to the aqueous phase. They provide a compact hydrodynamic diameter and low nonspecific binding in biological environment. However, cysteine-capped QDs generally exhibit modest colloidal stability in water and their fluorescence quantum yield (QY) is significantly reduced as compared to organics. We demonstrate that during phase transfer the deprotonation of the thiol group by carefully adjusting the pH is of crucial importance for increasing the binding strength of cysteine to the QD surface. As a result, the colloidal stability of cysteine-capped InP/ZnS core/shell QDs is extended from less than one day to several months. The developed method is of very general character and can be used also with other hydrophilic thiols and various other types of QDs, e.g., CdSe/CdS/ZnS and CuInS(2)/ZnS QDs as well as CdSe and CdSe/CdS nanorods. We show that the observed decrease of QY upon phase transfer with cysteine is related to the generation of cysteine dimer, cystine. This side-reaction implies the formation of disulfide bonds, which efficiently trap photogenerated holes and inhibit radiative recombination. On the other hand, this process is not irreversible. By addition of an appropriate reducing agent, tris(2-carboxyethyl)phosphine hydrochloride (TCEP), the QY can be partially recovered. When TCEP is already added during the phase transfer, the QY of cysteine-capped InP/ZnS QDs can be maintained almost quantitatively. Finally, we show that penicillamine is a promising alternative to cysteine for the phase transfer of QDs, as it is much less prone to disulfide formation.
DOI: 10.1021/nn203598c
PubMed: 22035355
Links toward previous steps (curation, corpus...)
Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Aqueous phase transfer of InP/ZnS nanocrystals conserving fluorescence and high colloidal stability.</title><author><name sortKey="Tamang, Sudarsan" uniqKey="Tamang S">Sudarsan Tamang</name><affiliation wicri:level="3"><nlm:affiliation>CEA-Grenoble, INAC-SPrAM (UMR 5819 CEA-CNRS-UJF)-LEMOH, 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>CEA-Grenoble, INAC-SPrAM (UMR 5819 CEA-CNRS-UJF)-LEMOH, 17 Rue des Martyrs, 38054 Grenoble Cedex 9</wicri:regionArea><placeName><region type="region" nuts="2">Rhône-Alpes</region><settlement type="city">Grenoble</settlement></placeName></affiliation></author><author><name sortKey="Beaune, Gregory" uniqKey="Beaune G">Grégory Beaune</name></author><author><name sortKey="Texier, Isabelle" uniqKey="Texier I">Isabelle Texier</name></author><author><name sortKey="Reiss, Peter" uniqKey="Reiss P">Peter Reiss</name></author></titleStmt><publicationStmt><date when="2011">2011</date><idno type="doi">10.1021/nn203598c</idno><idno type="RBID">pubmed:22035355</idno><idno type="pmid">22035355</idno><idno type="wicri:Area/Main/Corpus">001094</idno><idno type="wicri:Area/Main/Curation">001094</idno><idno type="wicri:Area/Main/Exploration">001590</idno></publicationStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Colloids (chemistry)</term><term>Crystallization (methods)</term><term>Fluorescence</term><term>Indium (chemistry)</term><term>Luminescent Measurements (methods)</term><term>Materials Testing</term><term>Nanostructures (chemistry)</term><term>Nanostructures (ultrastructure)</term><term>Particle Size</term><term>Phase Transition</term><term>Phosphines (chemistry)</term><term>Quantum Dots</term><term>Selenium Compounds (chemistry)</term><term>Water (chemistry)</term><term>Zinc Compounds (chemistry)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Colloids</term><term>Indium</term><term>Phosphines</term><term>Selenium Compounds</term><term>Water</term><term>Zinc Compounds</term></keywords><keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Nanostructures</term></keywords><keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Crystallization</term><term>Luminescent Measurements</term></keywords><keywords scheme="MESH" qualifier="ultrastructure" xml:lang="en"><term>Nanostructures</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Fluorescence</term><term>Materials Testing</term><term>Particle Size</term><term>Phase Transition</term><term>Quantum Dots</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Small thiol-containing amino acids such as cysteine are appealing surface ligands for transferring semiconductor quantum dots (QDs) from organic solvents to the aqueous phase. They provide a compact hydrodynamic diameter and low nonspecific binding in biological environment. However, cysteine-capped QDs generally exhibit modest colloidal stability in water and their fluorescence quantum yield (QY) is significantly reduced as compared to organics. We demonstrate that during phase transfer the deprotonation of the thiol group by carefully adjusting the pH is of crucial importance for increasing the binding strength of cysteine to the QD surface. As a result, the colloidal stability of cysteine-capped InP/ZnS core/shell QDs is extended from less than one day to several months. The developed method is of very general character and can be used also with other hydrophilic thiols and various other types of QDs, e.g., CdSe/CdS/ZnS and CuInS(2)/ZnS QDs as well as CdSe and CdSe/CdS nanorods. We show that the observed decrease of QY upon phase transfer with cysteine is related to the generation of cysteine dimer, cystine. This side-reaction implies the formation of disulfide bonds, which efficiently trap photogenerated holes and inhibit radiative recombination. On the other hand, this process is not irreversible. By addition of an appropriate reducing agent, tris(2-carboxyethyl)phosphine hydrochloride (TCEP), the QY can be partially recovered. When TCEP is already added during the phase transfer, the QY of cysteine-capped InP/ZnS QDs can be maintained almost quantitatively. Finally, we show that penicillamine is a promising alternative to cysteine for the phase transfer of QDs, as it is much less prone to disulfide formation.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="MEDLINE"><PMID Version="1">22035355</PMID><DateCreated><Year>2011</Year><Month>12</Month><Day>27</Day></DateCreated><DateCompleted><Year>2012</Year><Month>04</Month><Day>17</Day></DateCompleted><DateRevised><Year>2013</Year><Month>11</Month><Day>21</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1936-086X</ISSN><JournalIssue CitedMedium="Internet"><Volume>5</Volume><Issue>12</Issue><PubDate><Year>2011</Year><Month>Dec</Month><Day>27</Day></PubDate></JournalIssue><Title>ACS nano</Title><ISOAbbreviation>ACS Nano</ISOAbbreviation></Journal><ArticleTitle>Aqueous phase transfer of InP/ZnS nanocrystals conserving fluorescence and high colloidal stability.</ArticleTitle><Pagination><MedlinePgn>9392-402</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1021/nn203598c</ELocationID><Abstract><AbstractText>Small thiol-containing amino acids such as cysteine are appealing surface ligands for transferring semiconductor quantum dots (QDs) from organic solvents to the aqueous phase. They provide a compact hydrodynamic diameter and low nonspecific binding in biological environment. However, cysteine-capped QDs generally exhibit modest colloidal stability in water and their fluorescence quantum yield (QY) is significantly reduced as compared to organics. We demonstrate that during phase transfer the deprotonation of the thiol group by carefully adjusting the pH is of crucial importance for increasing the binding strength of cysteine to the QD surface. As a result, the colloidal stability of cysteine-capped InP/ZnS core/shell QDs is extended from less than one day to several months. The developed method is of very general character and can be used also with other hydrophilic thiols and various other types of QDs, e.g., CdSe/CdS/ZnS and CuInS(2)/ZnS QDs as well as CdSe and CdSe/CdS nanorods. We show that the observed decrease of QY upon phase transfer with cysteine is related to the generation of cysteine dimer, cystine. This side-reaction implies the formation of disulfide bonds, which efficiently trap photogenerated holes and inhibit radiative recombination. On the other hand, this process is not irreversible. By addition of an appropriate reducing agent, tris(2-carboxyethyl)phosphine hydrochloride (TCEP), the QY can be partially recovered. When TCEP is already added during the phase transfer, the QY of cysteine-capped InP/ZnS QDs can be maintained almost quantitatively. Finally, we show that penicillamine is a promising alternative to cysteine for the phase transfer of QDs, as it is much less prone to disulfide formation.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Tamang</LastName><ForeName>Sudarsan</ForeName><Initials>S</Initials><Affiliation>CEA-Grenoble, INAC-SPrAM (UMR 5819 CEA-CNRS-UJF)-LEMOH, 17 Rue des Martyrs, 38054 Grenoble Cedex 9, France.</Affiliation></Author><Author ValidYN="Y"><LastName>Beaune</LastName><ForeName>Grégory</ForeName><Initials>G</Initials></Author><Author ValidYN="Y"><LastName>Texier</LastName><ForeName>Isabelle</ForeName><Initials>I</Initials></Author><Author ValidYN="Y"><LastName>Reiss</LastName><ForeName>Peter</ForeName><Initials>P</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType>Journal Article</PublicationType><PublicationType>Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2011</Year><Month>11</Month><Day>08</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>ACS Nano</MedlineTA><NlmUniqueID>101313589</NlmUniqueID><ISSNLinking>1936-0851</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance>Colloids</NameOfSubstance></Chemical><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance>Phosphines</NameOfSubstance></Chemical><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance>Selenium Compounds</NameOfSubstance></Chemical><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance>Zinc Compounds</NameOfSubstance></Chemical><Chemical><RegistryNumber>045A6V3VFX</RegistryNumber><NameOfSubstance>Indium</NameOfSubstance></Chemical><Chemical><RegistryNumber>059QF0KO0R</RegistryNumber><NameOfSubstance>Water</NameOfSubstance></Chemical><Chemical><RegistryNumber>1315-09-9</RegistryNumber><NameOfSubstance>zinc selenide</NameOfSubstance></Chemical><Chemical><RegistryNumber>22398-80-7</RegistryNumber><NameOfSubstance>indium phosphide</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName MajorTopicYN="N">Colloids</DescriptorName><QualifierName MajorTopicYN="N">chemistry</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Crystallization</DescriptorName><QualifierName MajorTopicYN="Y">methods</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y">Fluorescence</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Indium</DescriptorName><QualifierName MajorTopicYN="Y">chemistry</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Luminescent Measurements</DescriptorName><QualifierName MajorTopicYN="Y">methods</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Materials Testing</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Nanostructures</DescriptorName><QualifierName MajorTopicYN="N">chemistry</QualifierName><QualifierName MajorTopicYN="N">ultrastructure</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Particle Size</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Phase Transition</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Phosphines</DescriptorName><QualifierName MajorTopicYN="Y">chemistry</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y">Quantum Dots</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Selenium Compounds</DescriptorName><QualifierName MajorTopicYN="Y">chemistry</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Water</DescriptorName><QualifierName MajorTopicYN="Y">chemistry</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N">Zinc Compounds</DescriptorName><QualifierName MajorTopicYN="Y">chemistry</QualifierName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="aheadofprint"><Year>2011</Year><Month>11</Month><Day>8</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2011</Year><Month>11</Month><Day>1</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2011</Year><Month>11</Month><Day>1</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2012</Year><Month>4</Month><Day>18</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="doi">10.1021/nn203598c</ArticleId><ArticleId IdType="pubmed">22035355</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=IndiumV2/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 001590 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 001590 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= *** parameter Area/wikiCode missing ***
|area= IndiumV2
|flux= Main
|étape= Exploration
|type= RBID
|clé= pubmed:22035355
|texte= Aqueous phase transfer of InP/ZnS nanocrystals conserving fluorescence and high colloidal stability.
}}
Pour générer des pages wiki
HfdIndexSelect -h $EXPLOR_AREA/Data/Main/Exploration/RBID.i -Sk "pubmed:22035355" \
| HfdSelect -Kh $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd \
| NlmPubMed2Wicri -a IndiumV2
| This area was generated with Dilib version V0.5.76. |  |