Na_2SO_4辅助水热合成SnO_2纳米晶

Na_2SO_4-assisted Hydrothermal Synthesis of SnO_2 Nanocrystals

系统地研究了以SnCl4·5H2O为原料,以Na2SO4为矿化剂,采用水热法在较低温度下和较短的反应时间内制备结晶良好并均匀分散的SnO2纳米晶。采用X射线衍射(XRD)、透射电子显微镜(TEM)、红外光谱(IR)等技术对水热反应的晶化过程进行了分析。结果表明:在Na2SO4存在的情况下,在120℃反应4h即可制备得到晶粒细小,分散性能良好的SnO2纳米晶。XRD衍射峰峰宽随水热温度的升高或反应时间的延长而变窄,结晶性提高。TEM结果表明产物颗粒小、分散性能良好。水热反应温度和反应时间对产物结晶度和粒径有明显的影响。对Na2SO4在反应过程中的作用机理进行了分析。

SnO2 nanocrystals were prepared by a hydrothermal method using SnCl4·5H2O as the raw material and Na2SO4 as mineralizer at lower reaction temperature and shorter time. X-ray diffraction （XRD）, Transmission electron microscope （TEM） and Infrared spectroscopy （IR） were used to characterize the crystallizing process of SnO2. The results show that smaller particles of SnO2 nanocrystals are obtained at 120 ℃ for 4 h using Na2SO4 as the mineralizer. XRD results show that the broadening of the diffraction peaks becomes narrower and sharper as the hydrothermal temperature turns higher or the time turns longer. TEM results show that the particles have narrow size distributions. The reaction temperature and time have obvious influences on the crystallinity and particle size. The mechanism of the effect of Na2SO4 on SnO2 formation was analyzed.