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Single-crystalline BiVO4 microtubes with square cross-sections: microstructure, growth mechanism, and photocatalytic property

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dc.contributor.authorZhou, L.
dc.contributor.authorWang, W.
dc.contributor.authorZhang, L.
dc.contributor.authorXu, H.
dc.contributor.authorZhu, W.
dc.date.issued2007
dc.description.abstractSingle-crystalline bismuth vanadate (BiVO4) microtubes, with novel square cross-sections and flower-like morphology constructed by several tubes radiating from the center, were synthesized by a facile reflux method at 80 °C. No surfactants or templates were involved in the shaping process. The microtubes are of monoclinic structure with a [010] growth direction with a side length of ca. 800 nm and a wall thickness of ca.100 nm. A series of morphology evolutions of BiVO4 from nanoparticles, to microrods, and then to microtubes have been arrested. The growth mechanism for the BiVO4 microtubes is proposed to be a dissolution−recrystallization-induced concentration depletion mechanism, which is different from other micro/nanotubes formed by layered structure materials reported previously. The presence of NaHCO3 is crucial in forming the tubular structure by the equilibrium of the formation and dissociation of carbonic acid. Optical absorption experiments revealed the BiVO4 microtubes had strong absorption in the visible light region in addition to the UV light region, and the energy of the band gap was estimated to be 2.36 eV. The as-synthesized microtubes exhibited higher photocatalytic activity under visible light irradiation (λ > 400 nm) than that of the reference sample prepared by solid-state reaction, which may be ascribed to the special single-crystalline tubular structure and/or flower-like morphology.
dc.identifier.citationJournal of Physical Chemistry C, 2007; 111(37):13659-13664
dc.identifier.doi10.1021/jp065155t
dc.identifier.issn1932-7447
dc.identifier.issn1932-7455
dc.identifier.orcidXu, H. [0000-0002-9126-1593]
dc.identifier.urihttps://hdl.handle.net/1959.8/121828
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.rightsCopyright 2007 American Chemical Society
dc.source.urihttps://doi.org/10.1021/jp065155t
dc.subjectchemistry
dc.subjectdecomposition
dc.subjectdomain-walls
dc.subjectmaterials science
dc.subjectphysical
dc.subjectrhodamine-B
dc.titleSingle-crystalline BiVO4 microtubes with square cross-sections: microstructure, growth mechanism, and photocatalytic property
dc.typeJournal article
pubs.publication-statusPublished
ror.mmsid9915911409501831

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