Structural transformation of carbon-encapsulated iron nanoparticles during heat treatment at 1000°C

被引：28

作者：

Huo, Junping

Song, Huaihe ^{[1
]}

Chen, Xiaohong

Zhao, Suoqi

Xu, Chunming

机构：

[1] Beijing Univ Chem Technol, Coll Mat Sci & Engn, Minist Educ, Key Lab Sci & Technol Controllable React, Beijing 100029, Peoples R China

[2] China Petr Univ, State Key Lab Heavy Oil, Beijing 102249, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2007年 / 101卷 / 01期

基金：

中国国家自然科学基金;

关键词：

carbon-encapsulated; nanostructures; heat treatment; electron microscopy;

D O I：

10.1016/j.matchemphys.2005.12.048

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Carbon-encapsulated iron nanoparticles have been synthesized on a large scale by co-carbonization of an aromatic heavy oil and ferrocene at 495 degrees C under autogenous pressure. In this paper, the effects of heat treatment at 1000 degrees C on the transformation of morphology and structure of carbon-encapsulated iron nanoparticles were investigated using TEM, HREM and XRD measurements. It was found that the nanoparticles became larger and exhibited various morphologies, e.g. hollow carbon cages and carbon nanotubes, via heat treatment. The disordered carbon shell was transformed into well-ordered graphitic structure under the catalysis of iron core during heat treatment. The transformation mechanism during heat-treatment was discussed in detail. (c) 2006 Published by Elsevier B.V.

引用

页码：221 / 227

页数：7

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