Preparation of silicon carbide nanotubes by hydrothermal method
Preparation of silicon carbide nanotubes by hydrothermal method
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DOI：
10.1063/1.2202111
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发表时间：
2006-06-01
影响因子：
3.2
通讯作者：
Zhang, Y.
中科院分区：
文献类型：
--
作者：
Pei, L. Z.;Tang, Y. H.;Zhang, Y.
在超临界水热条件下制备了无金属催化剂的一维小直径碳化硅纳米管。用X射线衍射仪、能谱、选区电子衍射仪、透射电子显微镜、高分辨电子显微镜、拉曼光谱和红外光谱对所制备的碳化硅纳米管进行了表征。结果表明，样品是由晶态的β-碳化硅结构和少量残留碳纳米颗粒组成的碳化硅纳米管。具有小内孔的碳化硅纳米管的外径小于10 nm，长度为微米。碳化硅纳米管的结构为中空的内孔、多壁的晶态碳化硅和薄的非晶态氧化硅外层。提出了取代反应模型来解释碳化硅纳米管的形成。碳原子扩散到硅纳米管中，硅纳米管中的硅原子通过取代化学反应部分取代碳原子，形成碳化硅纳米管。(C)2006年美国物理研究所。
One-dimensional SiC nanotubes with small diameter without metallic catalysts were prepared under supercritically hydrothermal conditions. The SiC nanotubes were characterized by x-ray diffraction, energy dispersive x-ray spectrum, selected area electron diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, and Raman and infrared spectra. The results show that the samples are SiC nanotubes composed with crystalline beta-SiC structure and some residual carbon nanoscale grains. The SiC nanotubes with small inner pores have an outer diameter of less than 10 nm and length of micrometers. The structures of SiC nanotubes are hollow inner pores, multiwall crystalline SiC layers, and thin amorphous silicon oxide outer layers. The substitution reaction model is proposed to explain the formation of SiC nanotubes. C atoms diffuse into Si nanotubes and Si atoms in Si nanotubes are partially substituted for C atoms by substitution chemical reaction, resulting in the formation of SiC nanotubes. (c) 2006 American Institute of Physics.