碳热还原制备不同形貌的碳化硅纳米线  

Synthesis of Silicon Carbide Nanowires with Different Morphologies by Carbothermal Reduction

作　　者：郝雅娟[1,2] 靳国强[1] 郭向云[1] 

机构地区：[1]中国科学院山西煤炭化学研究所,煤转化重点实验室 [2]中国科学院研究生院,北京100039

出　　处：《无机化学学报》2006年第10期1833-1837,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.20471067)

摘　　要：以酚醛树脂为碳源,正硅酸乙酯为硅源,硝酸镧和表面活性剂为调控剂,通过溶胶-凝胶和碳热还原反应制备了不同形貌的碳化硅纳米线。采用X射线衍射、扫描电子显微镜、透射电子显微镜和X射线散射能谱对所制备的碳化硅纳米线进行表征。结果表明,通过此方法所制备的碳化硅纳米线均为立方结构的β-SiC,分别具有直线状、竹节状和链珠状、分枝状等不同形貌。金属催化剂和表面活性剂对碳化硅纳米线的结构和形貌变化有重要影响。Tetraethoxysilane （TEOS） and phenolic resin were employed as silica and carbon sources, respectively, and lanthanum nitrate and celyhrimethyl ammonium bromide （CTAB） as additives to prepare silicon carbide nanowires. XRD, SEM, TEM and EDX were used to characterize the SiC nanowires. The results show that the nanowires prepared by the carbothermal reduction method are β-SIC while their morphologies could be linear, bamboo-like, beaded or branched depending on the metal catalyst and surfactant employed in the sol-gel process.

关 键 词：碳化硅纳米线 溶胶-凝胶 碳热还原 硝酸镧 表面活性剂 

分 类 号：O613.71[理学—无机化学] O613.72[理学—化学]