C/SnO_2纳米管芯复合结构的原位生长及生长机理

The in situ synthesis and growth mechanism of C/SnO_2 nano core-shell composite structure

采用化学气相沉积(CVD)方法在经表面活性剂处理过的Si(100)衬底上原位合成了C/SnO2纳米复合结构。利用扫描电子显微镜(SEM)、X射线能量色散谱(EDS)、透射电子显微镜(TEM)等分析仪器分别对所制备样品的形貌、成分及微结构进行表征。研究发现:制备产物为非晶态碳纳米管复合物。该碳纳米管复合物呈现出管芯复合结构,成分为碳纳米管包覆的结晶良好的SnO2纳米线,且其生长方向沿(200)晶面。并在此基础上分析讨论了其生长机理,推测这种C/SnO2纳米管芯复合结构的生长是同步进行的,同时表面活性剂的碳化对形成碳纳米管有着重要作用。

C/SnO2 nano composite structures were in-situ synthesized by chemical vapor deposition（CVD）method on the monocrystalline Si（100） substrate processed by surfactant. The morphology, composition and microstructure of the sample were characterized by scanning electron microscope（SEM）, X-ray energy dispersive spectroscopy（EDS）, transmis-sion electron microscope（TEM） and the other analytical instruments, respectively. This composite presented a tube core composite structure, and the composition of carbon nanotubes coated by SnO2 were nanometer line well-crystallized,and the growth direction along the（200） crystal plane. On the basis of analysis, the growth mechanism was discussed, and deduced the C/SnO2 nanotubes core composite structure growth was synchronously, and the carbonization of surfactant plaied an role in the formation of the carbon nanotubes.