The role of γ-iron nanoparticulates in the growth of carbon nanotubes

被引：10

作者：

Khasanov, Airat ^{[1
]}

He, Jian ^{[2
]}

Gaillard, Jay ^{[3
]}

Yang, Keqin ^{[3
]}

Rao, Apparao M. ^{[3
]}

Cameron, C. Michelle ^{[4
]}

Schmeltzer, J. M. ^{[4
]}

Stevens, John G. ^{[4
]}

Nath, Amar ^{[4
]}

机构：

[1] Univ N Carolina, Mossbauer Effect Data Ctr, Asheville, NC 28804 USA

[2] Clemson Univ, Complex & Adv Mat Lab, Clemson, SC 29634 USA

[3] Clemson Univ, Dept Phys & Astron, Clemson, SC 29634 USA

[4] Univ N Carolina, Dept Chem, Asheville, NC 28804 USA

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2937125

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Carbon nanotubes (similar to 200 nm diameter) are grown by chemical vapor deposition using catalytic iron particles. Mossbauer spectroscopy enables differentiation among relatively large Fe3C, alpha-Fe, and nanosized superparamagnetic fee gamma-Fe particles. The antiferromagnetic configuration of gamma-Fe nanoparticles yields a significant fraction of uncompensated spins, producing a weak ferromagnetism that allows estimation of size (2-3 nm) via magnetization in zero field versus variable field cooling. This property of gamma-Fe nanoparticles has not been previously employed. We propose that the surfaces of 200 nm iron carbide particles are covered with nanosized gamma-Fe and graphitized carbon that participate in the catalytic growth of nanotubes. (C) 2008 American Institute of Physics.

引用

页数：3

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