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采用化学气相沉积(CVD)法在碳纤维(CF)表面原位生长碳纳米管(CNTs)。考察了不同催化剂、沉积温度、氢气流量以及样品距进气口距离等工艺参数对CNTs-CF生长的影响。利用SEM和高分辨透射电子显微镜(HRTEM)对CNTs-CF形貌和微结构进行了表征和分析。结果表明:在CF表面原位生长的CNTs为多壁结构,其中以Ni为催化剂得到的CNTs直径小、分布均匀;在600~750℃温度范围内,随着温度的升高,CNTs直径和长度减小,产量降低;随着氢气流量的增加,CNTs直径和长度均增加;距进气口30cm,在CF表面得到的CNTs覆盖率高、直径小且分布窄,有利于制备高质量CNTs。
Carbon nanotubes (CNTs) were grown in situ on a carbon fiber (CF) surface using chemical vapor deposition (CVD). The effects of different catalysts, deposition temperature, flow rate of hydrogen gas and sample inlet distance on CNTs-CF growth were investigated. The morphology and microstructure of CNTs-CF were characterized and analyzed by SEM and HRTEM. The results show that CNTs grown in-situ on CF surface have a multi-wall structure. CNTs with Ni as catalyst have small diameter and uniform distribution. In the temperature range of 600-750 ℃, the diameter and length of CNTs The diameter and length of CNTs increased with the increase of hydrogen flow rate. The coverage of CNTs on the CF surface was 30cm from the inlet and the diameter of the CNTs was small and the distribution was narrow, which was in favor of preparing high quality CNTs.