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

作者：Kim Sung Eun; Lee Sang Wha^*

来源：Materials Research Bulletin, 2012, 47(10): 2969-2973.

DOI：10.1016/j.materresbull.2012.04.061

• Composites
• Nanostructures
• Chemical synthesis
• Magnetic properties

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 degrees 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.

• 出版日期2012-10