微晶
聚乙烯吡咯烷酮
化学工程
材料科学
X射线光电子能谱
黄铁矿
聚合物
透射电子显微镜
热液循环
扫描电子显微镜
相(物质)
化学
纳米技术
高分子化学
有机化学
复合材料
冶金
工程类
作者
Dewei Wang,Qihua Wang,Tingmei Wang
出处
期刊:CrystEngComm
[The Royal Society of Chemistry]
日期:2010-01-01
卷期号:12 (11): 3797-3797
被引量:55
摘要
Well-defined pyrite FeS2 microcubes and micro-octahedra with high-yield and good uniformity were successfully synthesized by a convenient and simple polymer-assisted hydrothermal method. Employing S as sulfur source and FeCl2·4H2O as the precursor in the presence of polyvinylpyrrolidone (PVP) and polyvinyl alcohol (PVA), cube-shaped and octahedron-shaped pyrite FeS2 crystallites were successfully obtained by simply adjusting the NaOH concentration, and the size of the product can be readily tuned by varying the reaction parameters. The effects of various NaOH concentrations and the polymer dosage on the morphology evolution process were investigated systematically. The phase composition, morphology, structure, and properties of the as-obtained products were studied by X-ray diffraction, field emission scanning electron microscopy, (high-resolution) transmission electron microscopy, Fourier transform-infrared spectroscopy, X-ray photoelectron spectrometry, and UV-Vis spectrometry. It was found that besides the capping effect of the polymer reagents, the “synergistic effect” or “cooperative effect” between the PVA and the PVP also played a crucial role in directing the growth of the FeS2 crystallites. The possible formation mechanism of the FeS2 phase and morphology was tentatively proposed based on a series of contrast experiments. Moreover, the optical properties were also preliminarily studied. This method can be easily controlled and is expected to be extendable to the fabrication of other metal chalcogenides with controlled shape and structure.
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