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首页> 外文期刊>Chemistry: A European journal >Synthesis, Crystal Structure, and Colloidal Dispersions of Vanadium Tetrasulfide (VS4)
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Synthesis, Crystal Structure, and Colloidal Dispersions of Vanadium Tetrasulfide (VS4)

机译：四硫化钒（VS4）的合成，晶体结构和胶体分散

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摘要

Although many of the layered metal chalcogenides, such as MoS2, are well-studied, some other chalcogenides have received less attention by comparison. In particular, there has been an emerging interest in vanadium tetrasulfide (VS4), which displays useful properties as a component of hybrids. However, the synthetic methods and characteristics of individual VS4 are not yet well defined, and there is no report on its solution processability. Here we have synthesized VS4 by a simple and fast direct reaction between elements. Reinvestigation of the VS4 crystal structure yielded more precise atomic coordinates and interatomic distances, thereby confirming the crystallization of VS4 in the monoclinic C2/c group and its quasi-1D chainlike structure. As the chains in VS4 are only bonded by weak van der Waals forces, we further demonstrate that bulk VS4 may be ultrasonically dispersed in appropriate solvents to form colloids, similarly to the layered chalcogenides. VS4 particles in colloids retain their phase identity and rod-shaped morphology with lengths in the range of hundreds of nanometers. Isopropanol dispersion exhibited the highest concentration and stability, which was achieved owing to the repulsion caused by high negative charges on the edges of the particles.
机译：尽管对许多层状金属硫属元素化物（例如MoS2）进行了深入研究，但相比之下，其他一些硫属元素化物受到的关注较少。尤其是，人们对四硫化钒（VS4）表现出了浓厚的兴趣，它作为杂化物的组成部分显示出有用的特性。但是，单个VS4的合成方法和特性尚未得到很好的定义，也没有关于其溶液可加工性的报道。在这里，我们通过元素之间的简单快速直接反应合成了VS4。对VS4晶体结构的重新研究产生了更精确的原子坐标和原子间距离，从而证实了单斜C2 / c基团中的VS4结晶及其准1D链状结构。由于VS4中的链仅通过弱范德华力键合，因此我们进一步证明，与分层的硫族化物相似，大体积VS4可以超声分散在适当的溶剂中形成胶体。胶体中的VS4粒子保持其相一致和杆状形态，其长度在数百纳米的范围内。异丙醇分散体具有最高的浓度和稳定性，这是由于颗粒边缘上的高负电荷引起的排斥而实现的。

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