【摘要】 以毛竹炭化物作为模板,通过浸渍正硅酸乙酯溶胶,在氩气保护下经1450℃高温煅烧制得纳微米棒。场发射电镜的高分辨观察表明:竹炭导管内生长的纳微米棒呈六边形片层结构叠加形成的竹节状,直径100nm～500 nm,长度达30μm以上。X射线能谱分析及X射线衍射确认该纳微米棒的主要物质组成为碳化硅。研究表明:竹炭内部导管是生长纳微米棒的理想场所,竹炭的溶胶增重率影响碳化硅纳微米棒的形态和产量。竹材是大规模制备碳化物纳微米棒的优良生物模板原料。更多还原

【Abstract】 Carbonized bamboo was vacuum-infiltrated by a tetraethylorthosilicate solution and then heated at 1 450 ℃ for 5 h under an Ar atmosphere to prepare SiC nano-micro rods.Scanning electron microscopy revealed that many nano-micro rods with diameters of 100-500 nm and length of around 30 μm formed hexagonal layers that stacked to form a bamboo-like morphology.X-ray energy-dispersive spectra and X-ray diffraction patterns showed that the nano-micro rods were mainly silicon carbide.It was further found that nearly all the SiC nano-micro rods were located in the ducts derived from the tubular tissue of the bamboo and the weight gain by the infiltration determined the morphology and yield of the SiC nano-micro rods.This study indicates that bamboo would be an ideal biological template for preparing SiC nano-micro rods on a large scale.更多还原