Single-Crystalline BiVO4 Microtubes with Square Cross-Sections: Microstructure, Growth Mechanism, and Photocatalytic Property
Single-Crystalline BiVO4 Microtubes with Square Cross-Sections: Microstructure, Growth Mechanism, and Photocatalytic Property
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DOI：
10.1021/jp065155t
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发表时间：
2007-08
影响因子：
3.7
通讯作者：
Lin Zhou;Wenzhong Wang;Lisha Zhang;Haolan Xu;Wei Zhu
中科院分区：
文献类型：
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作者：
Lin Zhou;Wenzhong Wang;Lisha Zhang;Haolan Xu;Wei Zhu
采用简单的回流法制备了单晶钒酸铋(BiVO4)微管，该微管具有新颖的方形截面和从中心向中心辐射的花状结构，成型过程中不涉及任何表面活性剂或模板。微管为单斜晶系，沿[010]方向生长，边长约800 nm，壁厚约100 nm。BiVO4从纳米粒子到微棒再到微管的一系列形貌演化已经被阻止。与以往报道的层状结构材料形成的微/纳米管不同，BiVO_4微管的生长机制是溶解−再结晶引起的浓度耗尽机制。NaHCO3的存在是通过碳酸的形成和解离平衡形成管状结构的关键。光吸收实验表明，BiVO4微管对金属离子有很强的吸收作用。
Single-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 ...