基于水热反应制备SnO2纳米棒阵列

采用水热反应制备一维SnO₂纳米棒阵列并表征其物相结构和微观形貌，研究了水热反应的核心工艺条件如前驱体浓度、反应时间、反应温度、反应次数以及前驱体中NaCl添加剂等对纳米棒阵列的生长和形貌的影响。结果表明：较低的前驱体浓度有利于制备大长径比的纳米棒；改变反应时间调控纳米棒的长度；改变反应温度和次数调控纳米棒的长度、直径和基底覆盖率；在前驱体中加入NaCl，可增强纳米棒的取向生长并降低其基底覆盖率。

Control of Morphology of SnO2 Nanorod Array by Hydrothermal Reaction Process

One-dimensional SnO₂ nanorod arrays (1D-SnO₂ NRAs) have been synthesized through hydrothermal method. The influence of hydrothermal parameters such as precursor concentration, reaction time, temperature, number of reaction and NaCl addition on the growth and morphology of 1D-SnO₂ NRAs were investigated by means of scanning electron microscopy with energy dispersive spectroscopy and X-ray diffractometer . The results show that the low precursor concentration is conducive to the preparation of nanorods with large aspect ratio, while the reaction time can selectively change the length of the nanorods. Interestingly, the growth of the nanorod array has apparent temperature sensitivity, that is, the rod length, diameter and substrate coverage all increase significantly as the reaction temperature increases. Furthermore, the NaCl additives in the precursor can favor the oriented growth, whilst restrain the substrate coverage of nanorods.