Papers by Author: Ping Ren

Abstract: An effective technology of hydrothermal synthesizing flower-sphere MoS₂ by reaction of Na₂MoO₄ and CS(NH₂)₂ with NH₂OH•HCl as reductant was researched. The effect of the molar ratio of Mo to S, reaction temperature, reaction time, aging time on the yield, purity and morphology of the product was explored by means of X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that the optimal synthesis conditions are as follows: the molar ratio of Mo to S of 1:7, the temperature of 220°C, the reaction time of 24h and the aging time of 16h. Under these conditions, the inerratic and pure flower-sphere MoS₂ was obtained. Its average particle size is about 2μm and the petal is self-assembly growth. The yield of the product can reach 88%.

Abstract: The flower-sphere molybdenum disulfide has been synthesized by reaction of Na₂MoO₄ and CS(NH₂)₂ with NH₂OH·HCl or H₂C₂O₄ as reductant. The microstructure and chemical composition of the product were characterized by means of X-ray diffraction and scanning electron microscope. XRD patterns showed that the molar ratio of Mo to S had a great effect on the purity of the product. When the molar ratio of Mo to S was 1:5, the product was nearly pure MoS₂. SEM images showed that the particle size increased as the molar ratio of Mo to S reduced. The MoS₂ microspheres had rough surfaces and were constructed with sheet-like structures in the two systems. But the product from the system of NH₂OH·HCl as reductant has the bigger particle size, clearer petal-sheets, coarser surface and weaker agglomeration than that from the system H₂C₂O₄ as reductant. The possible chemical reactions in hydrothermal systems were preliminarily discussed.