Hydrothermal Synthesis of Nanocrystal FeS2 by the Seed-Induced Method
晶种法水热合成FeS2纳米晶

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 215-314nm and the direct band gap takes place blue shift. The mechanism of formation of FeS2 nanocrystal was discussed in terms of the growth process.