Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols

Photoactive europium doped titanium dioxide (Eu:TiO2) thin films were grown by a matrix assisted pulsed laser evaporation technique. TiO2 and Eu cation-adsorbed TiO2 nanoparticles (NPs) sols were used as starting materials. The sols were synthesized by a colloidal sol–gel route. In order to obtain s...

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Authors: Camps, I., Borlaf, Mario, Colomer, María T., Moreno, Rodrigo, Duta, Liviu, Nita, Cristina, Pérez del Pino, Ángel, Logofatu, Constantin, Serna, Rosalía, Gyorgy, Eniko
Format: article
Status:Published version
Publication Date:2017
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/156108
Online Access:http://hdl.handle.net/10261/156108
Access Level:Open access
Keyword:Oxide/graphene oxide composites
Optical-properties
Photocatalytic applications
Thermal-stability
Evaporation maple
Titanium-dioxide
Graphene oxide
Band-gap
Europium
Nanoparticles
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repository_id_str
spelling Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal solsCamps, I.Borlaf, MarioColomer, María T.Moreno, RodrigoDuta, LiviuNita, CristinaPérez del Pino, ÁngelLogofatu, ConstantinSerna, RosalíaGyorgy, EnikoOxide/graphene oxide compositesOptical-propertiesPhotocatalytic applicationsThermal-stabilityEvaporation mapleTitanium-dioxideGraphene oxideBand-gapEuropiumNanoparticlesPhotoactive europium doped titanium dioxide (Eu:TiO2) thin films were grown by a matrix assisted pulsed laser evaporation technique. TiO2 and Eu cation-adsorbed TiO2 nanoparticles (NPs) sols were used as starting materials. The sols were synthesized by a colloidal sol–gel route. In order to obtain solid targets, the sols were cooled down until solidification in liquid nitrogen. The irradiation of the solid targets was performed in a controlled oxygen atmosphere using an UV KrF* (λ = 248 nm, τFWHM ≤ 25 ns, ν = 10 Hz) excimer laser source. The NPs were transferred and deposited onto solid substrates placed in the front of the frozen targets, forming continuous thin films. The as-grown undoped and Eu:TiO2 thin films were submitted to post-deposition thermal treatments. The surface morphology, crystalline structure, and chemical composition of the thin films were characterized by field emission scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Functional optical properties of the films were investigated by UV-VIS-NIR spectroscopy, spectroscopic ellipsometry, and photoluminescence as a function of dopant concentration in the TiO2 host and annealing temperature. A direct correlation was established between the processing conditions, films structure, chemical composition and oxidation states studied both at the top surface and in-depth as well as their functional, optical properties. Eu doping induces a blue-shift of the absorption edge with respect to the as-grown samples. Under visible light excitation (λ = 488 nm, emitted by an Ar+ laser source), the Eu:TiO2 samples show characteristic photoluminescence corresponding to the 5D0 → 7Fi (i = 0, 1, 2, 3, 4) transitions of Eu+ ions in the visible spectral range. The samples treated at the highest annealing temperature are characterized by strong photoluminescence emission, high transmittance in the VIS-NIR spectral regions, and high refractive index.The authors thank the financial support of the Executive Unit for Financing Higher Education, Research, Development and Innovation of the Romanian Ministry of Education and Scientific Research under the contract PN-III-P2-2.1-PED-2016-1043 and the Spanish Ministry of Economy and Competitiveness under the project ENE2014-56109-C3-3-R. ICMAB acknowledges financial support from the Spanish Ministry of Economy and Competitiveness, through the “Severo Ochoa” Programme for Centres of Excellence in R&D (SEV- 2015-0496). I. C. and M. B. thank the financial support of Consejo Superior de Investigaciones Científicas for PhD Grants JAE-Pre-201100578 and JAE-Pre-083.Peer reviewedRoyal Society of Chemistry (UK)Ministry of Education and Research (Romania)Ministerio de Economía y Competitividad (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201720172017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/156108reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ENE2014-56109-C3-3-Rinfo:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV-2015-0496http://dx.doi.org/10.1039/C7RA05074GSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1561082026-05-22T06:33:51Z
dc.title.none.fl_str_mv Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols
title Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols
spellingShingle Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols
Camps, I.
Oxide/graphene oxide composites
Optical-properties
Photocatalytic applications
Thermal-stability
Evaporation maple
Titanium-dioxide
Graphene oxide
Band-gap
Europium
Nanoparticles
title_short Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols
title_full Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols
title_fullStr Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols
title_full_unstemmed Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols
title_sort Structure-property relationships for Eu doped TiO2 thin films grown by a laser assisted technique from colloidal sols
dc.creator.none.fl_str_mv Camps, I.
Borlaf, Mario
Colomer, María T.
Moreno, Rodrigo
Duta, Liviu
Nita, Cristina
Pérez del Pino, Ángel
Logofatu, Constantin
Serna, Rosalía
Gyorgy, Eniko
author Camps, I.
author_facet Camps, I.
Borlaf, Mario
Colomer, María T.
Moreno, Rodrigo
Duta, Liviu
Nita, Cristina
Pérez del Pino, Ángel
Logofatu, Constantin
Serna, Rosalía
Gyorgy, Eniko
author_role author
author2 Borlaf, Mario
Colomer, María T.
Moreno, Rodrigo
Duta, Liviu
Nita, Cristina
Pérez del Pino, Ángel
Logofatu, Constantin
Serna, Rosalía
Gyorgy, Eniko
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministry of Education and Research (Romania)
Ministerio de Economía y Competitividad (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Oxide/graphene oxide composites
Optical-properties
Photocatalytic applications
Thermal-stability
Evaporation maple
Titanium-dioxide
Graphene oxide
Band-gap
Europium
Nanoparticles
topic Oxide/graphene oxide composites
Optical-properties
Photocatalytic applications
Thermal-stability
Evaporation maple
Titanium-dioxide
Graphene oxide
Band-gap
Europium
Nanoparticles
description Photoactive europium doped titanium dioxide (Eu:TiO2) thin films were grown by a matrix assisted pulsed laser evaporation technique. TiO2 and Eu cation-adsorbed TiO2 nanoparticles (NPs) sols were used as starting materials. The sols were synthesized by a colloidal sol–gel route. In order to obtain solid targets, the sols were cooled down until solidification in liquid nitrogen. The irradiation of the solid targets was performed in a controlled oxygen atmosphere using an UV KrF* (λ = 248 nm, τFWHM ≤ 25 ns, ν = 10 Hz) excimer laser source. The NPs were transferred and deposited onto solid substrates placed in the front of the frozen targets, forming continuous thin films. The as-grown undoped and Eu:TiO2 thin films were submitted to post-deposition thermal treatments. The surface morphology, crystalline structure, and chemical composition of the thin films were characterized by field emission scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Functional optical properties of the films were investigated by UV-VIS-NIR spectroscopy, spectroscopic ellipsometry, and photoluminescence as a function of dopant concentration in the TiO2 host and annealing temperature. A direct correlation was established between the processing conditions, films structure, chemical composition and oxidation states studied both at the top surface and in-depth as well as their functional, optical properties. Eu doping induces a blue-shift of the absorption edge with respect to the as-grown samples. Under visible light excitation (λ = 488 nm, emitted by an Ar+ laser source), the Eu:TiO2 samples show characteristic photoluminescence corresponding to the 5D0 → 7Fi (i = 0, 1, 2, 3, 4) transitions of Eu+ ions in the visible spectral range. The samples treated at the highest annealing temperature are characterized by strong photoluminescence emission, high transmittance in the VIS-NIR spectral regions, and high refractive index.
publishDate 2017
dc.date.none.fl_str_mv 2017
2017
2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/156108
url http://hdl.handle.net/10261/156108
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ENE2014-56109-C3-3-R
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV-2015-0496
http://dx.doi.org/10.1039/C7RA05074G
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Royal Society of Chemistry (UK)
publisher.none.fl_str_mv Royal Society of Chemistry (UK)
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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