Preparation, morphology, and microstructure of diameter-controllable vapor-grown carbon nanofibers

Abstract

Pure vapor-grown carbon nanofibers (VGCNF's) with controllable diameters of 10-200 nm were prepared by an improved floating catalyst method. Through transmission electron microscopy (TEM) observation, it was found that VGCNF's have a duplex structure, a hollow and high-crystallinity graphite filament called primary carbon fiber surrounded by a pyrocarbon layer with low graphite crystallinity. It was observed using high-resolution TEM that VGCNF's have excellent graphitic crystallinity with graphite layers stacked neatly parallel to fiber axis. Moreover, x-ray diffraction results showed that the graphitic crystallinity of carbon fibers became higher with decreasing diameter of carbon fibers.

Synthesis of C60 nanotubes by liquid–liquid interfacial precipitation method: Influence of solvent ratio, growth temperature, and light illumination

“…nanotubes [1,2], nanorods [3,4], nanofibers [5,6], nanowires [7,8], nanohorns [9,10], with promising physical and chemical properties, have been fabricated. In this paper, fullerene "nanotubes" refer to single crystalline thin whiskers, composed of densely packed fullerene molecules along their growth axis discovered by Miyazawa et al in 2005 [11].…”

Synthesis and growth mechanism of carbon nanotubes and nanofibers from ethanol flames

“…Regular methods, such as arc-discharge (Zhao et al, 1997;Ando et al, 2002), laser ablation (Kokai et al, 2000), chemical vapor deposition (CVD) (Singh et al, 2003) (or called catalytic pyrolysis (Benito et al, 1998)), and solar method (Laplaze et al, 1998), etc. have been successfully used to synthesize CNTs, and vapor-grown method has also been widely used to grow carbon nanofibers (Collins et al, 2002;Endo et al, 2001a;Fan et al, 1998).…”

Improved hydrogen storage performance of Li–Mg–N–H materials by optimizing composition and adding single-walled carbon nanotubes

“…Following the initial milling of the LiNH 2 /MgH 2 mixture and the subsequent de/rehydrogenation cycles, a rehydrogenated sample was mixed with 5 wt% of the carbon additive, and ball milled for further 2 h under the same milling condition. The SWNTs used in our experiments were prepared by the semi-continuous arc discharge method [14] and the MWNTs with an average diameter about 30 nm were prepared by the floating catalyst method [15]. The purification of the SWNTs and MWNTs was performed with air oxidation and acid washing to remove amorphous carbon and metal catalyst particles [16].…”