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Nanoparticle shape anisotropy and photoluminescence properties : Europium containing ZnO as a Model Case

Nanoparticle shape anisotropy and photoluminescence properties : Europium containing ZnO as a Model Case

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GERIGK, Melanie, Philipp EHRENREICH, Markus R. WAGNER, Ilona WIMMER, Juan Sebastian REPARAZ, Clivia M. SOTOMAYOR TORRES, Lukas SCHMIDT-MENDE, Sebastian POLARZ, 2015. Nanoparticle shape anisotropy and photoluminescence properties : Europium containing ZnO as a Model Case. In: Nanoscale. 7(40), pp. 16969-16982. ISSN 2040-3364. eISSN 2040-3372. Available under: doi: 10.1039/c5nr02550h

@article{Gerigk2015Nanop-32339, title={Nanoparticle shape anisotropy and photoluminescence properties : Europium containing ZnO as a Model Case}, year={2015}, doi={10.1039/c5nr02550h}, number={40}, volume={7}, issn={2040-3364}, journal={Nanoscale}, pages={16969--16982}, author={Gerigk, Melanie and Ehrenreich, Philipp and Wagner, Markus R. and Wimmer, Ilona and Reparaz, Juan Sebastian and Sotomayor Torres, Clivia M. and Schmidt-Mende, Lukas and Polarz, Sebastian} }

<rdf:RDF xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:void="http://rdfs.org/ns/void#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/32339"> <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/29"/> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2015-12-04T09:48:38Z</dc:date> <dcterms:title>Nanoparticle shape anisotropy and photoluminescence properties : Europium containing ZnO as a Model Case</dcterms:title> <dc:contributor>Wimmer, Ilona</dc:contributor> <dc:language>eng</dc:language> <dcterms:rights rdf:resource="http://nbn-resolving.de/urn:nbn:de:bsz:352-20150914100631302-4485392-8"/> <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/32339/3/Gerigk_0-309326.pdf"/> <dcterms:issued>2015</dcterms:issued> <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/32339/3/Gerigk_0-309326.pdf"/> <foaf:homepage rdf:resource="http://localhost:8080/jspui"/> <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/41"/> <dc:creator>Sotomayor Torres, Clivia M.</dc:creator> <dc:creator>Polarz, Sebastian</dc:creator> <dc:creator>Wagner, Markus R.</dc:creator> <dc:creator>Wimmer, Ilona</dc:creator> <dc:contributor>Polarz, Sebastian</dc:contributor> <dc:creator>Gerigk, Melanie</dc:creator> <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/41"/> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2015-12-04T09:48:38Z</dcterms:available> <dc:contributor>Gerigk, Melanie</dc:contributor> <dc:creator>Schmidt-Mende, Lukas</dc:creator> <dc:contributor>Wagner, Markus R.</dc:contributor> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dc:contributor>Ehrenreich, Philipp</dc:contributor> <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/32339"/> <dc:contributor>Reparaz, Juan Sebastian</dc:contributor> <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/29"/> <dc:contributor>Schmidt-Mende, Lukas</dc:contributor> <dcterms:abstract xml:lang="eng">The precise control over electronic and optical properties of semiconductor (SC) materials is pivotal for a number of important applications like in optoelectronics, photocatalysis or in medicine. It is well known that the incorporation of heteroelements (doping as a classical case) is a powerful method for adjusting and enhancing the functionality of semiconductors. Independent from that, there already has been a tremendous progress regarding the synthesis of differently sized and shaped SC nanoparticles, and quantum-size effects are well documented experimentally and theoretically. Whereas size and shape control of nanoparticles work fairly well for the pure compounds, the presence of a heteroelement is problematic because the impurities interfere strongly with bottom up approaches applied for the synthesis of such particles, and effects are even stronger, when the heteroelement is aimed to be incorporated into the target lattice for chemical doping. Therefore, realizing coincident shape control of nanoparticle colloids and their doping still pose major difficulties. Due to a special mechanism of the emulsion based synthesis method presented here, involving a gelation of emulsion droplets prior to crystallization of shape-anisotropic ZnO nanoparticles, heteroelements can be effectively entrapped inside the lattice. Different nanocrystal shapes such as nanorods, -prisms, -plates, and -spheres can be obtained, determined by the use of certain emulsification agents. The degree of morphologic alterations depends on the type of incorporated heteroelement M(n+), concentration, and it seems that some shapes are more tolerant against doping than others. Focus was then set on the incorporation of Eu(3+) inside the ZnO particles, and it was shown that nanocrystal shape and aspect ratios could be adjusted while maintaining a fixed dopant level. Special PL properties could be observed implying energy transfer from ZnO excited near its band-gap (3.3 eV) to the Eu(3+) states mediated by defect luminescence of the nanoparticles. Indications for an influence of shape on photoluminescence (PL) properties were found. Finally, rod-like Eu@ZnO colloids were used as tracers to investigate their uptake into biological samples like HeLa cells. The PL was sufficient for identifying green and red emission under visible light excitation.</dcterms:abstract> <dc:contributor>Sotomayor Torres, Clivia M.</dc:contributor> <dc:creator>Ehrenreich, Philipp</dc:creator> <dc:creator>Reparaz, Juan Sebastian</dc:creator> </rdf:Description> </rdf:RDF>

Dateiabrufe seit 04.12.2015 (Informationen über die Zugriffsstatistik)

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