Hu Jun, Yin Guilin, Chen Junchen, Ge Meiying, Lu Jing, Yang Zhi, He Dannong
National Engineering Research Center for Nanotechnology, Shanghai 200241, P. R. China.
Phys Chem Chem Phys. 2015 Aug 28;17(32):20537-42. doi: 10.1039/c5cp02854j. Epub 2015 Jul 22.
Olive-shaped SnO2 nanocrystals were synthesized successfully via a facile hydrothermal route, using tin dichloride hydrate, oxalic acid dihydrate and polyvinylpyrrolidone as reaction precursors, and showed great potential in the large-scale preparation of SnO2 nanocrystals. The prepared SnO2 nanocrystals were characterized using XRD, XPS, SEM, TEM and HRTEM, and showed well-defined olive-shaped tetragonal single-crystals with irregular exposed facets. The growth mechanism of the olive-shaped SnO2 nanocrystals was considered after investigating the experimental conditions and reaction time. Due to the abundant active sites on the irregular surfaces, the gas sensing performance of the prepared SnO2 nanocrystals exhibited great gas sensing properties, including high sensitivity, selectivity and stability towards H2S with a very low detection limit (less than 0.5 ppm), revealing their great potential in commercial applications for H2S gas detection.
通过简便的水热法，以二水合氯化锡、二水合草酸和聚乙烯吡咯烷酮作为反应前驱体，成功合成了橄榄形二氧化锡纳米晶体，并且该方法在二氧化锡纳米晶体的大规模制备中显示出巨大潜力。使用X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和高分辨透射电子显微镜（HRTEM）对制备的二氧化锡纳米晶体进行了表征，结果表明其为具有不规则暴露面的轮廓清晰的橄榄形四方单晶。在研究实验条件和反应时间后，探讨了橄榄形二氧化锡纳米晶体的生长机制。由于不规则表面上存在丰富的活性位点，制备的二氧化锡纳米晶体的气敏性能表现出优异的气敏特性，包括对硫化氢具有高灵敏度、选择性和稳定性，检测限极低（低于0.5 ppm），这表明它们在硫化氢气体检测的商业应用中具有巨大潜力。
