水热法批量制备粒径可控SnO2纳米粉体（英文）

以SnCl4·5H2O为前驱体、NH3·H2O为矿化剂,通过水热还原技术制备平均粒径在5～30nm的SnO2纳米粉末。系统研究小批量生产(1kg/批)条件下,工艺条件包括溶液浓度、反应温度、压力、时间和pH值对SnO2粒径、形貌和晶型的影响,并采用XRD、TEM等测试手段对样品进行表征。结果表明,在保持SnO2粉末晶型和形貌不变的前提下,通过调节反应温度、反应时间等工艺参数,粉末的粒径尺寸可以有效地控制在5～30nm范围内。不同于之前的报道,SnO2粒径尺寸随着反应时间(反应温度)的变化存在新的变化趋势,并推测解释了此晶粒异常生长的机理。

Integrated process of large-scale and size-controlled SnO2 nanoparticles by hydrothermal method

SnO₂ nanoparticles with the average particle size of 5–30 nm were synthesized using SnCl₄·5H₂O as the precursor and NH₃·H₂O as the mineralizing agent by hydrothermal method. In the case of 1 kg/batch production, the effects of synthesis conditions including solution concentration, reaction temperature, pressure, time and pH value on the grain size, particle morphology and crystal structure of SnO₂ were systematically studied. The particles were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that, the particle size can be well controlled in the range of 5–30 nm by adjusting the processing parameters such as reaction temperature and time when the crystal structure and particle morphology remain unchanged. The previous reports, the unusual dependences of the grain size of SnO₂ on reaction temperature and time were found. The mechanism for such abnormal grain growth behavior was tentatively elucidated.