Size-controllable one-dimensional SnO2 nanocrystals: synthesis, growth mechanism, and gas sensing property.
Size-controllable one-dimensional SnO2 nanocrystals: synthesis, growth mechanism, and gas sensing property.
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DOI：
10.1039/b604560j
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发表时间：
2006-10
期刊：
影响因子：
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通讯作者：
Dong-Feng Zhang;Ling-Dong Sun;Gang Xu;Chunhua Yan
中科院分区：
文献类型：
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作者：
Dong-Feng Zhang;Ling-Dong Sun;Gang Xu;Chunhua Yan
通过调节前驱体浓度、反应时间和温度，采用溶液法合成了粒径和长径比可控的一维SnO（2）纳米单晶。通过在动力学范围内调节生长，较高的温度范围（220-240摄氏度）有利于SnO（2）纳米线的生长，而低于220摄氏度的反应仅导致纳米棒甚至纳米颗粒。SnO（2）纳米晶的聚集体以空心球和树枝状的形式存在，它们是纳米线的中间体。根据透射电镜和扫描电镜的观察，从反胶束的性质和金红石型SnO（2）的晶习的角度讨论了其生长机理。对不同组装方式的SnO（2）纳米晶进行了CO气敏测试。结果表明，灵敏度与纳米晶的比表面积密切相关。
Single crystalline one-dimensional (1-D) SnO(2) nanocrystals with controllable sizes, including the diameter and the aspect ratio, were synthesized by modulating the precursor concentration, reaction time and temperature via a solution method. By regulating the growth in a kinetic regime, a higher temperature range (220-240 degrees C) was beneficial to the growth of SnO(2) nanowires, while reactions below 220 degrees C only resulted in nanorods or even nanoparticles. The aggregates of SnO(2) nanocrystals in the forms of hollow spheres and dendrites were observed as the intermediates for the nanowires. Based on the TEM and SEM observations, the growth mechanism is discussed from the viewpoints of the nature of the reverse micelles and the crystal habit of rutile SnO(2). CO gas sensing measurements were also carried out for SnO(2) nanocrystals with different assembly styles. The results indicate that the sensitivity had close correlation to the specific surface area of the nanocrystals.