Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 2, Pages 609-616Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm13720d
Keywords
-
Funding
- National Natural Science Foundation of China [20973029]
- Program for New Century Excellent Talents in Universities of China [NCET-07-013]
- Dalian University of Technology
Ask authors/readers for more resources
Fe@SiO2 and FeSi2@SiO2 nanoparticles with core@shell structure have successfully been synthesized by direct silane silicification of Fe2O3 nanoparticles. The as-prepared samples were characterized by N-2 physisorption, X-ray diffraction, transmission electron microscopy, temperature programmed reduction of H-2 X-ray photoelectron spectroscopy, Mossbauer spectroscopy, and superconducting quantum interference magnetometry. It was found that the amorphous SiO2 shell was formed to protect the core against oxidation when the reduced Fe2O3 nanoparticles were silicified by silane. When the reduced Fe2O3 nanoparticles were exposed to air, a Fe2O3 layer was formed. The structure of the core changed from cubic Fe to orthorhombic FeSi2 with increasing silicification temperatures from 350 to 550 degrees C, due to the dissolution of Si atoms into the iron lattice. The magnetic characterization showed that all samples have ferromagnetic nature and the saturation magnetization values drastically decreased with increasing silicification temperature. This novel methodology can be applied to synthesis of Co@SiO2 and Ni@SiO2 with core@shell structure. The as-prepared Fe@SiO2 and FeSi2@SiO2 nanoparticles with core@shell structure can find applications in magnetically separable catalysts, biomedicines, and magnetically recording materials.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available