SnO₂@碳纳米角复合物基NO₂气体传感器的研究

SnO₂@Carbon Nanohorns Nanocomposite Based Gas Sensor

摘要: 本文提出了一种简便、新颖的SnO₂碳纳米复合材料的结构设计。2~3 nm的SnO₂纳米颗粒均匀地分布在碳纳米角的表面。由于纳米复合材料的比表面积大，可以为NO₂的检测提供足够的活性位点。SnO₂纳米颗粒与碳框架之间的密切导电接触不仅为电子转移提供了途径，而且抑制了SnO₂在结晶过程中的生长和团聚。所制备的SnO₂复合碳纳米角纳米结构材料表现出较好的气体传感性能。值得注意的是，在室温下SnO₂@CNHs纳米复合材料对NO₂的快速检测比相应的SnO₂要高。本文也深入地讨论了气敏传感机制。为开发高效新型气体传感材料提供思路。

Abstract: A facile and novel architecture design of SnO₂ impregnated carbon nanohorns nanocomposite (SnO₂@CNHs) is presented. SnO₂ nanoparticles (2~3 nm) are homogeneously distributed on the surface of spherical CNHs. Due to the large specific surface area, CNHs in the nanocomposite can provide enough active sites for the detection of NO₂. The intimate conductive contact between the SnO₂ nanoparticles and the carbon framework not only provides a pathway for electron transfer but also suppresses the growth and agglomeration of SnO₂ during the crystallization process. As expected, the nanostructured materials exhibit preferable gas sensing properties. Remarkably, the confined SnO₂@CNHs nanocomposite shows rapid detection of NO₂ at room temperature (RT) than that of the corresponding SnO₂.