Synthesis and properties of γ-Fe2O3 nanoclusters within mesoporous aluminosilicate matrices

被引：97

作者：

Zhang, Lei ^{[1
]}

Papaefthymiou, Georgia C. ^{[2
,3
]}

Ying, Jackie Y. ^{[1
]}

机构：

[1] Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States

[2] Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, United States

[3] Department of Physics, Villanova University, Villanova, PA 19085, United States

来源：

| 2001年 / 105期

关键词：

Aluminum compounds - Condensation - Evaporation - Interfaces (materials) - Iron oxides - Light absorption - Magnetization - Mesoporous materials - Pore size - Quantum theory - Spectroscopic analysis - Superparamagnetism - Synthesis (chemical) - Thermodynamic stability - Ultraviolet radiation;

D O I：

10.1021/jp010174i

中图分类号：

学科分类号：

摘要：

Iron oxide nanoclusters were synthesized within mesoporous MCM-41 aluminosilicate matrices via evaporation-condensation of volatile Fe(CO)5. The well-defined hexagonally packed cylindrical pore structure of MCM-41 led to the derivation of γ-Fe2O3 particles with spherical and elongated morphologies. Magnetization studies and Mössbauer spectroscopy indicated that the γ-Fe2O3/MCM-41 nanocomposites exhibited interesting superparamagnetic behavior. A blue shift in the absorption edge relative to bulk iron oxide was noted in the UV-Vis spectra. Strain at the particle-support interface and quantum confinement effects played a critical role in determining the overall magnetic and optical behavior of the γ-Fe2O3/MCM-41 nanocomposites. The iron oxide nanoclusters within the MCM-41 matrix showed high thermal stability and increased magnetization when calcined at high temperatures.

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