Distinguishing the core from the shell in MnOx/MnOy and FeOx/MnOx core/shell nanoparticles through quantitative electron energy loss spectroscopy (EELS) analysis

被引：32

作者：

Estrade, S. ^{[1
,2
]}

Yedra, Ll ^{[1
]}

Lopez-Ortega, A. ^{[3
,4
]}

Estrader, M. ^{[3
,4
]}

Salazar-Alvarez, G. ^{[5
]}

Baro, M. D. ^{[6
]}

Nogues, J. ^{[3
,4
,7
]}

Peiro, F. ^{[1
]}

机构：

[1] Univ Barcelona, LENS, MIND IN2UB, Dept Elect, E-08028 Barcelona, Spain

[2] Univ Barcelona, TEM MAT, CCiT, E-08028 Barcelona, Spain

[3] CIN2 ICN CSIC, Bellaterra 08193, Barcelona, Spain

[4] Univ Autonoma Barcelona, Catalan Inst Nanotechnol, Bellaterra 08193, Barcelona, Spain

[5] Stockholm Univ, Dept Mat & Environm Chem, Arrhenius Lab, S-10691 Stockholm, Sweden

[6] Univ Autonoma Barcelona, Dept Fis, Bellaterra 08193, Barcelona, Spain

[7] ICREA, Barcelona, Spain

来源：

MICRON | 2012年 / 43卷 / 01期

关键词：

EELS; Mn-oxide; Fe-oxide; Core-shell; Nanoparticles; MAGNETIC-PROPERTIES; EXCHANGE BIAS; MANGANESE OXIDES; SIZE; NANOSTRUCTURES; ANISOTROPY; NANOSCALE; FE;

D O I：

10.1016/j.micron.2011.04.002

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

The structural and chemical characterization of inverted bi-magnetic MnOx(antiferromagnetic)/MnOy(ferrimagnetic) and FeOx(soft-ferrimagnetic)/MnOx(hard-ferrimagnetic) core/shell nanoparticles has been carried out by means of scanning transmission electron microscopy with electron energy loss spectroscopy analysis, (S)TEM-EELS. Quantitative EELS was applied to assess the local composition of the nanoparticles by evaluating the local Mn oxidation state based on the Mn L-3/L-2 peak intensity ratio and the Mn L-3 peak onset. The analysis allows to unambiguously distinguish the core from the shell and to determine the nature of the involved manganese oxides in both cases. The results evidence that the structure of the nanoparticles is, in fact, more complex than the one designed by the synthesis parameters. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：30 / 36

页数：7

共 32 条

[1] Antiferromagnetic MnO nanoparticles with ferrimagnetic Mn3O4 shells:: Doubly inverted core-shell system [J].