|Abstract||A simple approach using 90 nm Ni nanoparticles to tune the growth of carbon fibers is developed basing on the bottom-up regulation in this study. By adjusting the preparing temperature and atmospheric composition, the nickel-containing catalysts with specific sizes and shapes are alternately prepared from 90 nm to 500 nm. The straight carbon nanofibers and three kinds of carbon coils (single-helix carbon nanocoils, single-helix carbon microcoils and twinning double-helix carbon microcoils) with the coil diameter ranging from 150 nm to 3 mu m are achieved by using the as-prepared catalyst. The relationship between the carbon coil and catalyst particle, and the growth mechanism for different kinds of helices are discussed in details. The results suggest that catalytic anisotropy come from growing tendency and rate of carbon deposition on the facets, edges and vertices of catalyst grain. The twinning structure exists in each fiber of the double-helix carbon microcoils regardless of circular or flat fiber, which is separated by the tip of the catalyst particle due to the different rate of carbon deposition at edge and vertex. (C) 2013 Elsevier Ltd. All rights reserved.|
; wang, dingchuan
; jiang, man
; zhou, zuowan
; lu, jun
; xu, xiaoling
; wang, yong] southwest jiaotong univ, sch mat sci & engn, minist educ, key lab adv technol mat, chengdu 610031, peoples r china. [liu, hongyang] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [wang, li
; gong, zizheng] china acad space technol, beijing 100094, peoples r china. [yang, mingli] sichuan univ, inst atom & mol phys, chengdu 610065, peoples r china. [gou, jihua] univ cent florida, dept mech mat & aerosp engn, orlando, fl 32816 usa. [hui, david] univ new orleans, dept mech engn, new orleans, la 70148 usa.
; zhou, zw (reprint author), southwest jiaotong univ, sch mat sci & engn, minist educ, key lab adv technol mat, chengdu 610031, peoples r china.
X. Jian,D. C. Wang,H. Y. Liu,et al. Controllable synthesis of carbon coils and growth mechanism for twinning double-helix catalyzed by Ni nanoparticle[J]. Composites Part B-Engineering,2014,61:350-357.
X. Jian.,D. C. Wang.,H. Y. Liu.,M. Jiang.,Z. W. Zhou.,...&D. Hui.(2014).Controllable synthesis of carbon coils and growth mechanism for twinning double-helix catalyzed by Ni nanoparticle.Composites Part B-Engineering,61,350-357.