Tm-doped TiO2 and Tm2Ti2O7 pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase
Identifieur interne : 000078 ( Main/Exploration ); précédent : 000077; suivant : 000079Tm-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 :
- Beilstein Journal of Nanotechnology [ 2190-4286 ] ; 2015.
Abstract
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
Affiliations:
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pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase</title>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">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</title>
<author><name sortKey="De Los Santos, Desire M" sort="De Los Santos, Desire M" uniqKey="De Los Santos D" first="Desiré M" last="De Los Santos">Desiré M. De Los Santos</name>
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<author><name sortKey="Navas, Javier" sort="Navas, Javier" uniqKey="Navas J" first="Javier" last="Navas">Javier Navas</name>
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<author><name sortKey="Aguilar, Teresa" sort="Aguilar, Teresa" uniqKey="Aguilar T" first="Teresa" last="Aguilar">Teresa Aguilar</name>
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<author><name sortKey="Sanchez Coronilla, Antonio" sort="Sanchez Coronilla, Antonio" uniqKey="Sanchez Coronilla A" first="Antonio" last="Sánchez-Coronilla">Antonio Sánchez-Coronilla</name>
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<author><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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<author><name sortKey="Alcantara, Rodrigo" sort="Alcantara, Rodrigo" uniqKey="Alcantara R" first="Rodrigo" last="Alcántara">Rodrigo Alcántara</name>
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<author><name sortKey="Pi Ero, Jose Carlos" sort="Pi Ero, Jose Carlos" uniqKey="Pi Ero J" first="Jose Carlos" last="Pi Ero">Jose Carlos Pi Ero</name>
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<wicri:noRegion>E-11510 Puerto Real (Cádiz)</wicri:noRegion>
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<author><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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<series><title level="j">Beilstein Journal of Nanotechnology</title>
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<front><div type="abstract" xml:lang="en"><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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<name sortKey="Aguilar, Teresa" sort="Aguilar, Teresa" uniqKey="Aguilar T" first="Teresa" last="Aguilar">Teresa Aguilar</name>
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<name sortKey="Blanco, Ginesa" sort="Blanco, Ginesa" uniqKey="Blanco G" first="Ginesa" last="Blanco">Ginesa Blanco</name>
<name sortKey="Fernandez Lorenzo, Concha" sort="Fernandez Lorenzo, Concha" uniqKey="Fernandez Lorenzo C" first="Concha" last="Fernández-Lorenzo">Concha Fernández-Lorenzo</name>
<name sortKey="Martin Calleja, Joaquin" sort="Martin Calleja, Joaquin" uniqKey="Martin Calleja J" first="Joaquín" last="Martín-Calleja">Joaquín Martín-Calleja</name>
<name sortKey="Navas, Javier" sort="Navas, Javier" uniqKey="Navas J" first="Javier" last="Navas">Javier Navas</name>
<name sortKey="Pi Ero, Jose Carlos" sort="Pi Ero, Jose Carlos" uniqKey="Pi Ero J" first="Jose Carlos" last="Pi Ero">Jose Carlos Pi Ero</name>
<name sortKey="Sanchez Coronilla, Antonio" sort="Sanchez Coronilla, Antonio" uniqKey="Sanchez Coronilla A" first="Antonio" last="Sánchez-Coronilla">Antonio Sánchez-Coronilla</name>
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