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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Controlled Fabrication of BiFeO3 Uniform Microcrystals and Their Magnetic and Photocatalytic Behaviors
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Controlled Fabrication of BiFeO3 Uniform Microcrystals and Their Magnetic and Photocatalytic Behaviors

机译：BiFeO3均匀微晶的可控制备及其磁和光催化行为

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摘要

Bismuth ferrite (BiFeO3) uniform microcrystals with various morphologies (microspheres and micro/ submirocubes) were successfully synthesized by a controlled hydrothermal method. The resulting micro-structures were characterized using X-ray diffraction, scanning/transmission electron microscopies and Raman spectroscopy. Possible formation mechanism for BiFeO3 microcrystals was proposed. UV-vis spectra showed that the optical properties of the microsized BiFeO3 crystals were strongly related to their shape and size. We further demonstrated the useful photocatalytic activity of these regular-shaped structures as determined by degradation of Congo red under visible-light irradiation (λ > 400 nm). Additionally, magnetic responses were observed to be influenced by the morphology of as-synthesized BiFeO3 products, and the ferroelectric performance of BiFeO3 submicrocube was also studied by piezoelectric force microscopy (PFM). Being a multiferroic semiconductor with suitable narrow band gap (～2.2 eV) and uniform morphologies, these BiFeO3 microcrystals might be useful for the design of devices combining magnetic, electronic, and optical functionalities.
机译：通过控制水热法成功地合成了具有各种形态（微球和微/亚微镜）的铋铁氧体（BiFeO3）均匀微晶。使用X射线衍射，扫描/透射电子显微镜和拉曼光谱对所得的微结构进行表征。提出了BiFeO3微晶可能的形成机理。紫外可见光谱表明，微细BiFeO3晶体的光学性质与它们的形状和大小密切相关。我们进一步证明了这些规则形状的结构的有用的光催化活性，这是由刚果红在可见光照射下（λ> 400 nm）的降解确定的。此外，观察到磁响应受合成后的BiFeO3产物形态的影响，并且还通过压电力显微镜（PFM）研究了BiFeO3亚微立方体的铁电性能。这些BiFeO3微晶是具有合适的窄带隙（〜2.2 eV）和均匀形态的多铁性半导体，可能对结合磁，电子和光学功能的器件设计很有用。

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