Degradation and Healing Mechanisms of Carbon Fibers during the Catalytic Growth of Carbon Nanotubes on Their Surfaces

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• 作者：Kyoung Ju Kim ; Woong-Ryeol Yu ; Ji Ho Youk ; Jinyong Lee
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：April 25, 2012
• 年：2012
• 卷：4
• 期：4
• 页码：2250-2258
• 全文大小：834K
• 年卷期：v.4,no.4(April 25, 2012)
• ISSN：1944-8252

文摘

This study reports on the main cause of the reduced tensile strength of carbon fibers (CFs) by investigating the microstructural changes in the CFs that are undergoing mainly two processes: catalyst nanoparticle formation and chemical vapor deposition (CVD). Interestingly, the two processes oppositely influenced the tensile strength of the CFs: the former negatively and the latter positively. The catalysts coating and nanoparticle formation degraded the CF surface by inducing amorphous carbons and severing graphitic layers, while those defects were healed by both the injected carbons and interfaced CNTs during the CVD process. The revealed degradation and healing mechanisms can serve as a fundamental engineering basis for exploring optimized processes in the manufacturing of hierarchical reinforcements without sacrificing the tensile strength of the substrate CFs.

Keywords:

hierarchical reinforcement; catalytic growth; carbon nanotube; carbon fibers; tensile strength; degradation and healing