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Descripción
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| Titanium oxide is the most widely used photocatalyst because of its exceptional optical and electronic properties, strong oxidizing power, non-toxicity, chemical stability and low cost. Both theoretical and experimental studies have shown that the (001) surface of anatase TiO2 leads to an enhanced photoactivity; unfortunately that surface is energetically unfavorable so it is eliminated during crystal growth. This scenario can be modified by incorporating hydrofluoric acid (HF) during the synthesis stage: fluorine ions preferentially absorb on the surface of TiO2 nanoparticles stabilizing the ultra-reactive {001} facets. Moreover, fluorine atoms are good electron scavengers too, so they also contribute to enhance the TiO2 photoactivity. The problem is that HF is toxic and highly corrosive so its employ in a large-scale synthesis is hampered. In this frame trifluoroacetic acid (TFAA) has been recently considered as a less toxic alternative to HF. Here, we study the role of TFAA as both scavenger and morphological control agent for obtaining well-faceted anatase nanoparticles. Besides we propose a simple on-step synthesis method that allows the preparation of TFAA-modified anatase nanoparticles with specific morphology and selected stabilized facets. A broad spectrum of characterization techniques evidence that TFAA effectively adsorbs on the surface of TiO2 nanoparticles, either through the oxygen atoms of the TFAA molecule itself or as F- ions, thus stabilizing the {001} facets of anatase | |
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Internacional
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Si |
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Nombre congreso
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Electroceramics XIV Conferenceoc |
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Tipo de participación
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960 |
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Lugar del congreso
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Bucharest, Romania |
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Revisores
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Si |
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ISBN o ISSN
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DOI
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Fecha inicio congreso
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16/06/2014 |
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Fecha fin congreso
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20/06/2014 |
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Desde la página
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185 |
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Hasta la página
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186 |
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Título de las actas
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14th edition of ELECTROCERAMICS Conference ABSTRACTS BOOK |