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Tm-doped TiO2 and Tm2Ti2O7 pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase

Identifieur interne : 000260 ( Pmc/Curation ); précédent : 000259; suivant : 000261

Tm-doped TiO2 and Tm2Ti2O7 pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase

Auteurs : Desiré M. De Los Santos [Espagne] ; Javier Navas [Espagne] ; Teresa Aguilar [Espagne] ; Antonio Sánchez-Coronilla [Espagne] ; Concha Fernández-Lorenzo [Espagne] ; Rodrigo Alcántara [Espagne] ; Jose Carlos Pi Ero [Espagne] ; Ginesa Blanco [Espagne] ; Joaquín Martín-Calleja [Espagne]

Source :

RBID : PMC:4362206

Abstract

Summary

Tm-doped TiO2 nanoparticles were synthesized using a water-controlled hydrolysis reaction. Analysis was performed in order to determine the influence of the dopant concentration and annealing temperature on the phase, crystallinity, and electronic and optical properties of the resulting material. Various characterization techniques were utilized such as X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and UV–vis spectroscopy. For the samples annealed at 773 and 973 K, anatase phase TiO2 was obtained, predominantly internally doped with Tm3+. ICP–AES showed that a doping concentration of up to 5.8 atom % was obtained without reducing the crystallinity of the samples. The presence of Tm3+ was confirmed by X-ray photoelectron spectroscopy and UV–vis spectroscopy: the incorporation of Tm3+ was confirmed by the generation of new absorption bands that could be assigned to Tm3+ transitions. Furthermore, when the samples were annealed at 1173 K, a pyrochlore phase (Tm2Ti2O7) mixed with TiO2 was obtained with a predominant rutile phase. The photodegradation of methylene blue showed that this pyrochlore phase enhanced the photocatalytic activity of the rutile phase.


Url:
DOI: 10.3762/bjnano.6.62
PubMed: 25821701
PubMed Central: 4362206

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PMC:4362206

Le document en format XML

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O
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pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase</title>
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O
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pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase</title>
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<name sortKey="Fernandez Lorenzo, Concha" sort="Fernandez Lorenzo, Concha" uniqKey="Fernandez Lorenzo C" first="Concha" last="Fernández-Lorenzo">Concha Fernández-Lorenzo</name>
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<name sortKey="Martin Calleja, Joaquin" sort="Martin Calleja, Joaquin" uniqKey="Martin Calleja J" first="Joaquín" last="Martín-Calleja">Joaquín Martín-Calleja</name>
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<title>Summary</title>
<p>Tm-doped TiO
<sub>2</sub>
nanoparticles were synthesized using a water-controlled hydrolysis reaction. Analysis was performed in order to determine the influence of the dopant concentration and annealing temperature on the phase, crystallinity, and electronic and optical properties of the resulting material. Various characterization techniques were utilized such as X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and UV–vis spectroscopy. For the samples annealed at 773 and 973 K, anatase phase TiO
<sub>2</sub>
was obtained, predominantly internally doped with Tm
<sup>3+</sup>
. ICP–AES showed that a doping concentration of up to 5.8 atom % was obtained without reducing the crystallinity of the samples. The presence of Tm
<sup>3+</sup>
was confirmed by X-ray photoelectron spectroscopy and UV–vis spectroscopy: the incorporation of Tm
<sup>3+</sup>
was confirmed by the generation of new absorption bands that could be assigned to Tm
<sup>3+</sup>
transitions. Furthermore, when the samples were annealed at 1173 K, a pyrochlore phase (Tm
<sub>2</sub>
Ti
<sub>2</sub>
O
<sub>7</sub>
) mixed with TiO
<sub>2</sub>
was obtained with a predominant rutile phase. The photodegradation of methylene blue showed that this pyrochlore phase enhanced the photocatalytic activity of the rutile phase.</p>
</div>
</front>
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<journal-meta>
<journal-id journal-id-type="nlm-ta">Beilstein J Nanotechnol</journal-id>
<journal-id journal-id-type="iso-abbrev">Beilstein J Nanotechnol</journal-id>
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<subject>Nanotechnology</subject>
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<title-group>
<article-title>Tm-doped TiO
<sub>2</sub>
and Tm
<sub>2</sub>
Ti
<sub>2</sub>
O
<sub>7</sub>
pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>De los Santos</surname>
<given-names>Desiré M</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name>
<surname>Navas</surname>
<given-names>Javier</given-names>
</name>
<email>javier.navas@uca.es</email>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Aguilar</surname>
<given-names>Teresa</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Sánchez-Coronilla</surname>
<given-names>Antonio</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Fernández-Lorenzo</surname>
<given-names>Concha</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Alcántara</surname>
<given-names>Rodrigo</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Piñero</surname>
<given-names>Jose Carlos</given-names>
</name>
<xref ref-type="aff" rid="A2">2</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Blanco</surname>
<given-names>Ginesa</given-names>
</name>
<xref ref-type="aff" rid="A2">2</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Martín-Calleja</surname>
<given-names>Joaquín</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
</contrib-group>
<contrib-group>
<contrib contrib-type="editor">
<name>
<surname>Xu</surname>
<given-names>Rong</given-names>
</name>
<role>Associate Editor</role>
</contrib>
</contrib-group>
<aff id="A1">
<label>1</label>
Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain</aff>
<aff id="A2">
<label>2</label>
Departamento de Ciencias de los Materiales, Ingeniería Metalúrgica y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain</aff>
<pub-date pub-type="collection">
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>2</day>
<month>3</month>
<year>2015</year>
</pub-date>
<volume>6</volume>
<fpage>605</fpage>
<lpage>616</lpage>
<ext-link ext-link-type="doi" xlink:href="10.3762/bjnano.6.62">10.3762/bjnano.6.62</ext-link>
<history>
<date date-type="received">
<day>10</day>
<month>9</month>
<year>2014</year>
</date>
<date date-type="accepted">
<day>5</day>
<month>2</month>
<year>2015</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright © 2015, De los Santos et al; licensee Beilstein-Institut.</copyright-statement>
<copyright-year>2015</copyright-year>
<copyright-holder>De los Santos et al; licensee Beilstein-Institut.</copyright-holder>
<license license-type="Beilstein" xlink:href="http://www.beilstein-journals.org/bjnano">
<license-p>This is an Open Access article under the terms of the Creative Commons Attribution License (
<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/2.0">http://creativecommons.org/licenses/by/2.0</ext-link>
), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p>
<license-p>The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (
<ext-link ext-link-type="uri" xlink:href="http://www.beilstein-journals.org/bjnano">http://www.beilstein-journals.org/bjnano</ext-link>
)</license-p>
</license>
</permissions>
<abstract>
<title>Summary</title>
<p>Tm-doped TiO
<sub>2</sub>
nanoparticles were synthesized using a water-controlled hydrolysis reaction. Analysis was performed in order to determine the influence of the dopant concentration and annealing temperature on the phase, crystallinity, and electronic and optical properties of the resulting material. Various characterization techniques were utilized such as X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and UV–vis spectroscopy. For the samples annealed at 773 and 973 K, anatase phase TiO
<sub>2</sub>
was obtained, predominantly internally doped with Tm
<sup>3+</sup>
. ICP–AES showed that a doping concentration of up to 5.8 atom % was obtained without reducing the crystallinity of the samples. The presence of Tm
<sup>3+</sup>
was confirmed by X-ray photoelectron spectroscopy and UV–vis spectroscopy: the incorporation of Tm
<sup>3+</sup>
was confirmed by the generation of new absorption bands that could be assigned to Tm
<sup>3+</sup>
transitions. Furthermore, when the samples were annealed at 1173 K, a pyrochlore phase (Tm
<sub>2</sub>
Ti
<sub>2</sub>
O
<sub>7</sub>
) mixed with TiO
<sub>2</sub>
was obtained with a predominant rutile phase. The photodegradation of methylene blue showed that this pyrochlore phase enhanced the photocatalytic activity of the rutile phase.</p>
</abstract>
<abstract abstract-type="graphical">
<p>
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</abstract>
<kwd-group kwd-group-type="author">
<kwd>nanoparticles</kwd>
<kwd>photocatalysis</kwd>
<kwd>pyrochlore</kwd>
<kwd>titanium dioxide</kwd>
<kwd>thulium</kwd>
</kwd-group>
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