Facile synthesis of titania-encapsulated magnetites with controlled magnetism and surface morphology

Titania-encapsulated magnetites (A-Fe3O4@TiO2) were facilely fabricated through the modified sol–gel reaction of APTMS-complexed Fe3O4 (A-Fe3O4) with tetraethyl orthotitanate (TEOT). The magnetism and surface morphology of A-Fe3O4@TiO2 were controlled by adjusting the thickness of titania capsule la...

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Bibliographic Details
Published in:Materials research bulletin 2012-10, Vol.47 (10), p.2969-2973
Main Authors: Kim, Sung-Eun, Lee, Sang-Wha
Format: Article
Language:English
Subjects:
A. Composites
A. Nanostructures
B. Chemical synthesis
D. Magnetic properties
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Summary:Titania-encapsulated magnetites (A-Fe3O4@TiO2) were facilely fabricated through the modified sol–gel reaction of APTMS-complexed Fe3O4 (A-Fe3O4) with tetraethyl orthotitanate (TEOT). The magnetism and surface morphology of A-Fe3O4@TiO2 were controlled by adjusting the thickness of titania capsule layer. A-Fe3O4@TiO2 exhibited the superparamagnetic characteristics of negligible remanence and coercity. Thermal analysis of A-Fe3O4@TiO2 showed that the amorphous titania was transformed into crystalline phase at around 440°C. The core–shell magnetite–titanium nanocomposites can be an attractive candidate for recyclable photocatalysts with magnetite core and/or active Fe3O4 electrode materials with buffering TiO2 capsules.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2012.04.061