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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。
The C / SnO2 nanocomposite was synthesized in situ by chemical vapor deposition (CVD) on a surfactant-treated Si (100) substrate. The morphology, composition and microstructure of the prepared samples were characterized by scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM). It is found that the prepared product is an amorphous carbon nanotube composite. The carbon nanotube composite exhibits a die-core composite structure with well-crystallized SnO2 nanowires covered by carbon nanotubes and having a growth direction along a (200) crystal plane. Based on this, the growth mechanism was analyzed and discussed. It is speculated that the growth of the composite structure of C / SnO2 nanotubes is synchronous, and the carbonation of the surfactant plays an important role in the formation of carbon nanotubes.