Synthesis of carbon nanotubes on carbon fibers by modified chemical vapor deposition
Synthesis of carbon nanotubes on carbon fibers by modified chemical vapor deposition
复制标题
改良化学气相沉积法在碳纤维上合成碳纳米管
DOI：
10.1016/s1872-5805(12)60021-3
复制
发表时间：
2012-10-01
影响因子：
5.7
通讯作者：
Zhang Xiang-yu
中科院分区：
文献类型：
--
作者：
Hu Zhi-hui;Dong Shao-ming;Zhang Xiang-yu
采用改进的热化学气相沉积（CVD）法在碳纤维上制备了碳纳米管（CNTs）。纤维先在973 K温度下处理，然后用体积比为1：3的硫酸和硝酸混合物处理，以改善催化剂前体Fe（NO3）（3）中心点9 H（2）O在纤维表面的分散性，然后浸渍催化剂溶液。然后碳纤维同时经历催化剂还原和CNT生长，以减少过渡金属与碳纤维表面之间的接触时间，并且可以获得均匀且厚的CNT森林，而与传统热CVD制备的碳纤维相比，碳纤维的机械强度没有显著降低。深入分析表明，溶剂种类、Fe（NO3）（3）中心点9 H（2）O浓度、H2-与C2 H2的比例以及生长时间等工艺参数对碳纳米管的生长速率有很大的影响。结果表明，当催化剂溶剂为乙醇、Fe浓度为100 mmol/L、H2/C2 H2为4/1、温度为1 023 K、生长时间为30 min时，可以得到较好的碳纳米管森林。
Carbon nanotubes (CNTs) were synthesized on carbon fibers by a modified thermal chemical vapor deposition (CVD) method. The fibers were first treated at a temperature of 973 K and then treated by a mixture of sulfur acid and nitric acid with a volume ratio of 1:3 to improve the dispersion of catalyst precursor Fe(NO3)(3)center dot 9H(2)O on the surface before impregnation with a catalyst solution. The carbon fibers then underwent simultaneous catalyst reduction and CNT growth to decrease the contact time between the transition metal and the carbon fiber surface, and a uniform and thick CNT forest could be obtained with no significant decrease of the mechanical strength of the carbon fibers compared with those produced by traditional thermal CVD. An in-depth analysis shows that the process parameters have a great influence on the CNT growth rate, such as the type of solvent, concentration of Fe(NO3)(3)center dot 9H(2)O, the ratio of H-2 to C2H2, and the growth time. It was revealed that a better CNT forest could be obtained when the catalyst solvent is ethanol, the Fe concentration is 100 mmol/L, the ratio of H-2/C2H2 is 4/1, the temperature is 1 023 K and the growth time is 30 min.