沉积条件对碳纤维表面碳纳米管生长的影响

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。

Effects of deposition conditions on growth of carbon nanotubes on surface of carbon fibers

Carbon nanotubes (CNTs) were prepared directly on carbon fibers by chemical vapor deposition (CVD) method. The different process parameters such as catalyst, deposition temperature, hydrogen flow rate and distance between samples and intake were investigated in relation to morphology and structure. The samples were characterized and analyzed by SEM and high resolution transmission electron microscopy (HRTEM). Results show that CNTs in-situ grown on surface of CF is multi-wall structure. CNTs which grow on carbon fibers surface using Ni-catalyst are thin and uniform distribution. The diameter and length of CNTs using Fe-catalyst reduce and yield decrease when the deposition temperature rises from 600 ℃ to 750 ℃. The diameter and length of CNTs raise with hydrogen flow rate increasing. It is in favor of preparing high quality CNTs at 30 cm from fibers to intake, at which CNTs densely distribute on the carbon fiber surface and their diameter are uniform.