Leaf-like SnO₂ hierarchical architectures were successfully synthesized via a facile template-free hydrothermal synthesis method. The observations with field emission scanning electron microscopic and transmission electron microscopy demonstrated that the uniform and independent leaf-like SnO₂ architectures were obtained, and each dendrite was consisted by a main stem with two groups of highly symmetric and parallel branch. To investigate the effect of diammonium phosphate and the formation process of hierarchical SnO₂ leaf-like microstructure, the controlled experiments of the hydrothermal process with different amounts of diammonium phosphate and different reaction times have been carried out systematically. Based on the experimental results, a possible formation mechanism of SnO₂ hierarchical architecture was speculated. In addition, the gas sensing performances of the as-prepared products were investigated and the results revealed that the sensor based on the unique leaf-like SnO₂ hierarchical architectures exhibited high response and good selectivity properties to NO₂ at low working temperature.

通过简便的无模板水热合成方法成功合成了叶状SnO ₂层次结构。场发射扫描电子显微镜和透射电子显微镜的观察表明，获得了均匀且独立的叶状SnO ₂结构，并且每个枝晶均由具有两组高度对称且平行分支的主茎组成。研究磷酸氢二铵的作用和SnO ₂分层的形成过程叶片状的微结构，系统地进行了不同数量的磷酸氢二铵和不同反应时间的水热过程的控制实验。根据实验结果，推测了SnO ₂分层体系的可能形成机理。此外，对所制备产品的气体传感性能进行了研究，结果表明，基于独特的叶状SnO ₂分层结构的传感器在低工作温度下表现出高响应性和对NO _2的良好选择性。