Investigating Carbon Nanotube Growth for Superior Carbon Nanotube Yarns
- Investigating Carbon Nanotube Growth for Superior Carbon Nanotube Yarns
- 김승민; 정서정; 김환철; Eric A. Stach
- Carbon Nanotube; Growth termination
- Issue Date
- 2014 한국복합재료학회 하계워크샵
- Carbon nanotube (CNT) fibers are potentially one of a few materials that can possess higher strength than carbon fibers with the similar density. There have been three methods to produce CNT fibers: wet spinning, spinning from vertically aligned CNT forests, and direct and continuous spinning from CNT aerogels. In this presentation, the growth and growth termination of vertically aligned CNT forests will be mainly discussed. Synthesis of ultra-long, aligned arrays of CNTs by chemical vapor deposition (CVD) has been one of the most intensively studied topics for the last decades in the CNT community. Even though significant advances to extending the lifetime of catalyst particles and thus improving the efficiency of CNT growth have been made [7,8], the growth of vertically aligned CNT forests is always terminated after the certain length is attained, but the reason why the growth termination occurs is not yet fully answered. In order to solve this issue, we exploit in-situ carbon nanotube growth technique using the environmental-cell transmission electron microscope (E-TEM) combined with ex-situ growth followed by ex-situ TEM analysis as well as other characterization tools such as atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). In the last part of the presentation, the research on the continuous CNT fiber spinning at KIST will be briefly introduced.
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