Nanoparticle shape anisotropy and photoluminescence properties

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 me...

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Authors: Gerigk, Melanie, Ehrenreich, Philipp, Wagner, Markus R.|||0000-0002-7367-5629, Wimmer, Ilona, Reparaz, Juan Sebastián|||0000-0001-9679-0075, Sotomayor Torres, Clivia M.|||0000-0001-9986-2716, Schmidt-Mende, Lukas, Polarz, Sebastian
Format: article
Publication Date:2015
Country:España
Institution:Universitat Autònoma de Barcelona
Repository:Dipòsit Digital de Documents de la UAB
Language:English
OAI Identifier:oai:ddd.uab.cat:204885
Online Access:https://ddd.uab.cat/record/204885
https://dx.doi.org/urn:doi:10.1039/c5nr02550h
Access Level:Open access
Keyword:Bottom up approach
Defect luminescence
Electronic and optical properties
Nanoparticle colloids
Photoluminescence properties
Quantum size effects
Special mechanisms
Visible light excitation
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spelling Nanoparticle shape anisotropy and photoluminescence propertiesEuropium containing ZnO as a model caseGerigk, MelanieEhrenreich, PhilippWagner, Markus R.|||0000-0002-7367-5629Wimmer, IlonaReparaz, Juan Sebastián|||0000-0001-9679-0075Sotomayor Torres, Clivia M.|||0000-0001-9986-2716Schmidt-Mende, LukasPolarz, SebastianBottom up approachDefect luminescenceElectronic and optical propertiesNanoparticle colloidsPhotoluminescence propertiesQuantum size effectsSpecial mechanismsVisible light excitationThe 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, concentration, and it seems that some shapes are more tolerant against doping than others. Focus was then set on the incorporation of Eu³⁺ 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 Eu³⁺ 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. 22015-01-0120152015-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/204885https://dx.doi.org/urn:doi:10.1039/c5nr02550hreponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengEuropean Commission https://doi.org/10.13039/501100000780 628197Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2013-0295Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 MAT2012-31392Ministerio de Ciencia e Innovación https://doi.org/10.13039/501100004837 CSD2010-0044open accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:2048852026-06-06T12:50:31Z
dc.title.none.fl_str_mv Nanoparticle shape anisotropy and photoluminescence properties
Europium containing ZnO as a model case
title Nanoparticle shape anisotropy and photoluminescence properties
spellingShingle Nanoparticle shape anisotropy and photoluminescence properties
Gerigk, Melanie
Bottom up approach
Defect luminescence
Electronic and optical properties
Nanoparticle colloids
Photoluminescence properties
Quantum size effects
Special mechanisms
Visible light excitation
title_short Nanoparticle shape anisotropy and photoluminescence properties
title_full Nanoparticle shape anisotropy and photoluminescence properties
title_fullStr Nanoparticle shape anisotropy and photoluminescence properties
title_full_unstemmed Nanoparticle shape anisotropy and photoluminescence properties
title_sort Nanoparticle shape anisotropy and photoluminescence properties
dc.creator.none.fl_str_mv Gerigk, Melanie
Ehrenreich, Philipp
Wagner, Markus R.|||0000-0002-7367-5629
Wimmer, Ilona
Reparaz, Juan Sebastián|||0000-0001-9679-0075
Sotomayor Torres, Clivia M.|||0000-0001-9986-2716
Schmidt-Mende, Lukas
Polarz, Sebastian
author Gerigk, Melanie
author_facet Gerigk, Melanie
Ehrenreich, Philipp
Wagner, Markus R.|||0000-0002-7367-5629
Wimmer, Ilona
Reparaz, Juan Sebastián|||0000-0001-9679-0075
Sotomayor Torres, Clivia M.|||0000-0001-9986-2716
Schmidt-Mende, Lukas
Polarz, Sebastian
author_role author
author2 Ehrenreich, Philipp
Wagner, Markus R.|||0000-0002-7367-5629
Wimmer, Ilona
Reparaz, Juan Sebastián|||0000-0001-9679-0075
Sotomayor Torres, Clivia M.|||0000-0001-9986-2716
Schmidt-Mende, Lukas
Polarz, Sebastian
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Bottom up approach
Defect luminescence
Electronic and optical properties
Nanoparticle colloids
Photoluminescence properties
Quantum size effects
Special mechanisms
Visible light excitation
topic Bottom up approach
Defect luminescence
Electronic and optical properties
Nanoparticle colloids
Photoluminescence properties
Quantum size effects
Special mechanisms
Visible light excitation
description 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, concentration, and it seems that some shapes are more tolerant against doping than others. Focus was then set on the incorporation of Eu³⁺ 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 Eu³⁺ 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.
publishDate 2015
dc.date.none.fl_str_mv 2
2015-01-01
2015
2015-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/204885
https://dx.doi.org/urn:doi:10.1039/c5nr02550h
url https://ddd.uab.cat/record/204885
https://dx.doi.org/urn:doi:10.1039/c5nr02550h
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv European Commission https://doi.org/10.13039/501100000780 628197
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2013-0295
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 MAT2012-31392
Ministerio de Ciencia e Innovación https://doi.org/10.13039/501100004837 CSD2010-0044
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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