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首页> 外文期刊>Crystal growth & design >From bulk metal Bi to two-dimensional well-crystallized BiOX (X = Cl, Br) micro- and nanostructures: Synthesis and characterization
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From bulk metal Bi to two-dimensional well-crystallized BiOX (X = Cl, Br) micro- and nanostructures: Synthesis and characterization

机译：从块状金属Bi到二维良好结晶的BiOX（X = Cl，Br）微观和纳米结构：合成与表征

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摘要

In this article, for the first time, two-dimensional (2D) single-crystalline bismuth oxyhalides (BiOX, X = Cl, Br) micro- and nanostructures, such as nanoplates, nanosheets, and microsheets, were synthesized in a large scale by a simple wet chemistry approach of hydrogen peroxide (H2O2) direct oxidation of bulk metal bismuth (Bi) particles in a mixed solution followed by a hydrothermal treatment, instead of previous coprecipitation of Bi salts route. The in-plane size and thickness of the 2D products can be conveniently tailored by varying the temperature and the concentrations of the Bi precursor. The products were characterized by a range of methods, such as X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission microscopy, energy-dispersive X-ray spectroscopy, selected area electron diffraction, thermogravimetric analysis, Fourier transform infrared spectra, and UV-vis diffuse reflectance spectra. The BiOBr nanoplates, nanosheets, and microsheets have also been selectively synthesized via a similar route. The formation process investigation revealed that under hydrothermal treatment the spherical Bi oxhydrohalide nanopariticles could be side-by-side self-assembled to form Bi oxyhalide nanoplates by increasing the in-plane size, and nanosheets could be piled up to form Bi oxyhalide thick microsheets by increasing the thickness. The UV-vis diffuse reflectance spectra revealed that the estimated band gap energies were about 3.5, 3.3, 2.3, and 2.1 eV for BiOCl nanoplates, BiOCl micro- and nanosheets, BiOBr nanoplates, and BiOBr micro- and nanosheets, respectively. It is expected that the present study could be extended to facile, large-scale synthesis of various multicomponent 2D inorganic micro- and nanostructures, which would have better performances than the corresponding spherical nanoparticles and would be the new members in the family of advanced functional inorganic materials well-applied in industry.
机译：在本文中，首次大规模地通过以下方法合成了二维（2D）单晶卤化铋（BiOX，X = Cl，Br）微结构和纳米结构，例如纳米板，纳米片和微片。一种简单的湿法化学方法，即过氧化氢（H2O2）在混合溶液中直接氧化大块金属铋（Bi）颗粒，然后进行水热处理，而不是先前与Bi盐共沉淀的途径。通过改变Bi前体的温度和浓度，可以方便地调整2D产品的面内尺寸和厚度。产品通过一系列方法进行了表征，例如X射线粉末衍射，扫描电子显微镜，透射电子显微镜，高分辨率透射显微镜，能量色散X射线光谱，选定区域电子衍射，热重分析，傅里叶变换红外光谱和紫外可见漫反射光谱。 BiOBr纳米板，纳米片和微片也已通过相似的途径选择性合成。形成过程研究表明，在水热处理下，球形Bi oxhydrohalide纳米颗粒可以通过增加平面内尺寸并排自组装以形成Bi oxyhalide纳米片，并且可以将纳米片堆叠起来以形成Bi卤代氧化物厚的微片。增加厚度。紫外可见漫反射光谱表明，BiOCl纳米板，BiOCl微米和纳米片，BiOBr纳米片，BiOBr纳米片和BiOBr纳米片的估计带隙能量分别约为3.5、3.3、2.3和2.1 eV。预期本研究将扩展到各种多组分二维无机微结构和纳米结构的简便，大规模合成，其性能将优于相应的球形纳米颗粒，并且将成为高级功能无机家族的新成员。材料在工业上得到很好的应用。

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