晶种法水热合成FeS_2纳米晶

Hydrothermal Synthesis of Nanocrystal FeS_2 by the Seed-Induced Method

在水热体系中,加入了FeS2作为晶种,以EDTA、酒石酸为螯合剂优化反应条件,合成了FeS2纳米晶。用X射线衍射、扫描电子显微镜和透射电子显微镜进行了表征。结果表明产物为单一相黄铁矿型FeS2,纳米晶呈椭球状分布,平均粒径约20nm,其在紫外-可见光谱区内215-314nm是强吸收区,光学直接禁带宽度相对发生蓝移。并且对FeS2的形成机理进行了讨论。

FeS2(Pyrite) nanocrystals were synthesized successfully by the hydrothermal reaction using FeS2 crystalline seed with EDTA and tartaric acid as complex additives to optimize the preparation condition. The properties of the particles were investigated by X-ray diffraction, transmission electron microscopy and scanning electron microscopy. The results show that the product is single-phase pyrite with an ellipse-like shape and the average particle size of about 20nm. In the ultraviolet-visible range, pyrite shows a strong absorptivity between 215similar to314nm and the direct band gap takes place blue shift. The mechanism of formation of FeS2 nanocrystal was discussed in terms of the growth process.