An efficient synthetic strategy for ligand-free upconversion nanoparticles

dc.contributor.authorSun, Chunning
dc.contributor.authorSimke, Jan Ron Justin
dc.contributor.authorGradzielski, Michael
dc.date.accessioned2021-01-14T12:49:26Z
dc.date.available2021-01-14T12:49:26Z
dc.date.issued2020-08-12
dc.description.abstractHigh-quality lanthanide-doped upconversion nanoparticles are generally synthesized by employing long-chain oleic acid as the ligand in the synthetic process, rendering them hydrophobic, and preferentially dispersed in nonpolar solvents. Thus, postsynthetic surface modifications are required prior to practical applications. Herein, we have developed a facile approach to remove the surface ligand from oleate-stabilized upconversion nanoparticles using short-chain acids as stripping agents by a simple vortexing method on a time scale of 10 seconds. This method allows for the fast and efficient hydrophobic-to-hydrophilic transition in either biphasic solvent systems or single hydrophobic media without any noticeable detrimental effects on size, shape, and phase of crystals during the ligand removal process. Furthermore, the obtained ligand-free upconversion nanoparticles can be readily transferred to the aqueous solution and further modified with water-soluble capping molecules by sequential surface functionalization. As an example, by coupling polymer functionalized upconversion nanoparticles with organic dyes, we are able to construct nanoprobes for selective fluorescence sensing for Cu2+.en
dc.identifier.eissn2041-6539
dc.identifier.issn2041-6520
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/12446
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-11288
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/en
dc.subject.ddc540 Chemie und zugeordnete Wissenschaftende
dc.subject.othernanoparticlesen
dc.subject.othersynthesisen
dc.subject.otherligand-free upconversionen
dc.titleAn efficient synthetic strategy for ligand-free upconversion nanoparticlesen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1039/D0MA00411Aen
dcterms.bibliographicCitation.issue6en
dcterms.bibliographicCitation.journaltitleChemical Scienceen
dcterms.bibliographicCitation.originalpublishernameRoyal Society of Chemistryen
dcterms.bibliographicCitation.originalpublisherplaceCambridgeen
dcterms.bibliographicCitation.pageend1607en
dcterms.bibliographicCitation.pagestart1602en
dcterms.bibliographicCitation.volume1en
tub.accessrights.dnbfreeen
tub.affiliationFak. 2 Mathematik und Naturwissenschaften>Inst. Chemie>FG Physikalische Chemie / Molekulare Materialwissenschaftende
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.groupFG Physikalische Chemie / Molekulare Materialwissenschaftende
tub.affiliation.instituteInst. Chemiede
tub.publisher.universityorinstitutionTechnische Universität Berlinen
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