Investigation on the growth termination mechanism of aligned carbon nanotube arrays using a transmission electron microscopy for improving the properties of carbon nanotube fiber
- Investigation on the growth termination mechanism of aligned carbon nanotube arrays using a transmission electron microscopy for improving the properties of carbon nanotube fiber
- 정서정; Hwanchul Kim; 김승민
- CNT forests; carbon nanotubes; CNT growth
- Issue Date
- Carbon 2014
- Individual carbon nanotubes (CNTs) exhibit exceptional physical and mechanical properties compared to commercial carbon fibers, or conventional materials such as metals and ceramics at a molecular level. However, once CNTs are assembled into macroscopic fibers (or yarns), their properties are degraded to degrees that are much worse than carbon fibers or conventional materials, indicating that properties of macroscopic CNT fibers are dominantly affected by interfacial defects between CNTs comprising CNT fibers, not by intrinsic CNT properties. It is still believed that CNT fibers are potentially one of a few materials that can be stronger than carbon fibers with the similar density. In order for CNT fibers to possess comparable or even better properties than carbon fibers, CNT fibers should be made up of individual CNTs which have much longer length scale than currently available CNTs, thus decreasing a number density of interfacial defects.
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, the current CNT growth techniques still have limitations in producing long enough CNTs to fulfill the length scales for exceptional CNT fibers. In order to overcome these limitations, we should first understand the exact CNT growth termination mechanism. Several growth termination mechanisms have been suggested, among which two mechanisms have been well accepted in CNT growth community. One is the growth termination mechanism by carbon over-layer formation, and the other is by dynamic morphological evolution of catalyst particles during the growth. The best way to examine which mechanism describes the growth termination phenomena of aligned CNT arrays better is
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