通过铁催化乙醇分解合成异质结构螺旋状碳纳米管。

Synthesis of heterostructured helical carbon nanotubes by iron-catalyzed ethanol decomposition.

机构信息

School of Materials Science and Engineering, Dalian Jiaotong University, 116028 Dalian, PR China.

出版信息

Micron. 2011 Aug;42(6):547-52. doi: 10.1016/j.micron.2011.01.007. Epub 2011 Feb 12.

DOI:10.1016/j.micron.2011.01.007

Abstract

Shaping of carbon nanotubes (CNTs) into desired morphologies have attracted much attention recently. High quality heterostructured helical carbon nanotubes (HCNTs) were synthesized from transitional metal oxide and ethanol by chemical vapor deposition (CVD) in this paper. High resolution transmission electron microscopy (HRTEM) results showed that, heterostructured "U" shape, "G" shape and "S" shape HCNTs were achieved. Iron oxide was reduced to α-Fe by ethanol, and catalyzed the growth of heterostructured HCNTs. Helical coiling of HCNTs was induced by the anisotropic facet catalytic activity of α-Fe catalyst for carbon deposition. Then, symmetrical growth of two HCNTs from one catalyst nanoparticle resulted in symmetrical "U" shape HCNTs, while successive connecting of several "arc" and "tail" HCNTs led to asymmetrical "G" and "S" morphologies HCNTs.

摘要

最近，将碳纳米管（CNTs）塑造成所需形态引起了广泛关注。本文通过化学气相沉积（CVD）法，用过渡金属氧化物和乙醇合成了高质量的异质结构螺旋碳纳米管（HCNTs）。高分辨率透射电子显微镜（HRTEM）结果表明，实现了异质结构的“U”形、“G”形和“S”形 HCNTs。乙醇将氧化铁还原为α-Fe，并催化了异质结构 HCNTs 的生长。HCNTs 的螺旋卷曲是由α-Fe 催化剂对碳沉积的各向异性面催化活性引起的。然后，两个 HCNTs 从一个催化剂纳米粒子的对称生长导致了对称的“U”形 HCNTs，而几个“弧”和“尾”HCNTs 的连续连接导致了不对称的“G”和“S”形态 HCNTs。