Carbon Fiber Engineering Research Center, School of Material Science and Engineering, Shandong University, Jinan 250061, People's Republic of China.
Nanotechnology. 2018 Sep 28;29(39):395602. doi: 10.1088/1361-6528/aad10c. Epub 2018 Jul 4.
An effective approach has been developed for the catalytic decomposition of acetylene (CH) by chemical vapor deposition (CVD), to achieve homogeneous growth of carbon nanotubes (CNTs) on the surfaces of carbon fibers. The morphology of CNTs grown on carbon fiber surfaces was observed by a scanning electron microscope and high-resolution transmission electron microscope, which revealed the uniform coverage of CNTs on the carbon fiber surfaces. The single fiber tensile test demonstrated that the tensile strength of carbon fibers could be increased by more than 12% with the catalytic growth of CNTs on their surface. The reparation of the damage caused during the formation of catalyst nanoparticles, and the cross-link of neighboring graphite crystallites induced by CNTs all occurred during the CVD process, which were considered to be the main reasons for improvement. The growth mechanism model of CNTs formation was established based on the thermodynamics principle and the interface microstructure of CNT-grown carbon fiber, illuminating the detailed mechanism for the growth of CNTs and the change of the shape of catalyst particles.
一种有效的方法已经被开发出来，用于通过化学气相沉积（CVD）催化分解乙炔（CH），以实现碳纳米管（CNTs）在碳纤维表面的均匀生长。通过扫描电子显微镜和高分辨率透射电子显微镜观察到在碳纤维表面生长的 CNTs 的形态，结果表明 CNTs 在碳纤维表面上的均匀覆盖。单纤维拉伸试验表明，通过在碳纤维表面上催化生长 CNTs，碳纤维的拉伸强度可以提高 12%以上。在 CVD 过程中，发生了催化剂纳米颗粒形成过程中的损伤修复，以及 CNTs 诱导的相邻石墨晶粒的交联，这被认为是提高强度的主要原因。基于 CNT 生长碳纤维的热力学原理和界面微观结构，建立了 CNT 形成的生长机制模型，阐明了 CNT 生长和催化剂颗粒形状变化的详细机制。
