Electron holography of single-crystal iron nanorods encapsulated in carbon nanotubes

被引：17

作者：

Fujita, Takeshi

Chen, Mingwei ^{[1
]}

Wang, Xiaomin

Xu, Bingshe

Inoke, Koji

Yamamoto, Kazuo

机构：

[1] Tohoku Univ, Inst Mat Res, Int Frontier Ctr Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan

[2] Taiyuan Univ Technol, Minist Educ, Key Lab Inteface Sci & Engn Adv Mat, Taiyuang 030024, Peoples R China

[3] FEI Co Japan Ltd, Minato Ku, Tokyo 1080075, Japan

[4] Arizona State Univ, Ctr Solid State Sci, Tempe, AZ 85287 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2007年 / 101卷 / 01期

基金：

日本学术振兴会;

关键词：

D O I：

10.1063/1.2407523

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

alpha-Fe nanorods encapsulated in multiwall carbon nanotubes (CNTs) were characterized by x-ray diffraction (XRD), high resolution electron microscopy (HREM), and electron holography. HREM observations revealed that the alpha-Fe nanoparticles were single crystals with a preferential growth direction of < 200 >(alpha-Fe) oriented along CNTs. Phase distributions of an alpha-Fe nanorod were measured by electron holography and the remanent state was retrieved by a three-dimensional morphological model and an algorithm with the consideration of irregular nanoparticle shape. It was found that the saturated magnetization of the alpha-Fe nanorod with a CNT outer shell was very close to that of bulk pure alpha-Fe, suggesting that the core-shell nanostructure effectively prevented the surface oxidation that had been found to significantly degrade the magnetic properties of nanostructured alpha-Fe. (c) 2007 American Institute of Physics.

引用

页数：5

共 35 条

[1] Mapping of electrostatic potentials within core-shell nanowires by electron holography [J].