催化剂结构与形态对碳纳米管生长的影响

新型炭材料, 2003, 18(4): 271-276. doi: 10.3969/j.issn.1007-8827.2003.04.004

催化剂结构与形态对碳纳米管生长的影响

雷中兴 ^1, , 刘静 ^2, , 王建波 ^3, , 李轩科 ^4, , 汪厚植 ^5,

1.武汉科技大学,纳米材料与技术中心,湖北,武汉,430081

2.武汉科技大学,纳米材料与技术中心,湖北,武汉,430081

3.武汉大学,电子显微镜中心,湖北,武汉,430072

4.武汉科技大学,纳米材料与技术中心,湖北,武汉,430081

5.武汉科技大学,高温陶瓷与耐火材料湖北省重点实验室,湖北,武汉,430081

基金项目: 湖北省教育厅科研项目(2002Z01007,2003Z002) 国家自然科学基金(50272042)

关键词：碳纳米管 , 气凝胶催化剂 , 化学气相沉积 , 微观结构

The effects of catalyst structure and morphology on the growth of carbon nanotubes

采用溶胶-凝胶超临界流体干燥技术制备了含铁、钴的纳米SiO2复合气凝胶催化剂,用于碳纳米管和纳米碳包覆磁性纳米粒子的合成.利用N2物理吸附、XRD、TEM、HRTEM、EDS、SAED等手段对催化剂在不同温度下处理后晶型的转变、形态的变化进行了分析,并考察了催化剂对碳纳米管形貌、结构和碳增重率的变化.结果表明:随着处理温度从600℃升高到1000℃,催化剂比表面积从312.4m2/g降低到79.6m2/g,催化剂粒子从非晶态向晶态转变,粒径从5nm增大至60nm左右,碳的增重率从254.8%下降41.5%.采用低温处理的催化剂,碳产物中以碳纳米管为主,而采用较高温度处理后的催化剂,碳产物中则以碳包覆粒子为主,且随处理温度的升高碳包覆粒子的含量逐渐增加.

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