Title :
Optical and magnetic properties of γ-Fe2O3 nanoparticles encapsulated in SBA-15 fabricated by double solvent technique
Author :
Peng Dai ; Yuxia Wang ; Mingzai Wu ; Zouming Xu
fDate :
3/1/2012 12:00:00 AM
Abstract :
The double solvent method was employed to prepare γ-Fe2O3 nanoparticles encapsulated in mesoporous silica (γ-Fe2O3/SBA-15). The as-synthesised γ-Fe2O3/SBA-15 samples were studied by means of X-ray diffraction, Fourier transform infrared, transmission electron microscopy, N2 adsorption porosimetry, UV-vis absorption spectra and vibrating sample magnetometer (VSM). The γ-Fe2O3/SBA-15 nanocomposite keeps the ordered hexagonal mesoporous structure of SBA-15. With the iron concentration decreasing, the particle size of samples decreased, and the optical absorption edges showed a blue shift. VSM results indicate that the as-obtained nanocomposites exhibit superparamagnetic behaviour.
Keywords :
Fourier transform spectra; X-ray diffraction; absorption coefficients; adsorption; infrared spectra; iron compounds; magnetometers; mesoporous materials; nanocomposites; nanofabrication; nanoparticles; particle size; silicon compounds; spectral line shift; superparamagnetism; transmission electron microscopy; ultraviolet spectra; visible spectra; Fe2O3-SiO2; Fourier transform infrared spectra; SBA-15 fabrication; UV-vis absorption spectra; VSM; X-ray diffraction; adsorption porosimetry; blue shift; double solvent technique; hexagonal mesoporous structure; iron concentration; magnetic properties; mesoporous silica; nanocomposite; nanoparticle encapsualtion; optical absorption edges; optical properties; particle size; superparamagnetic behaviour; transmission electron microscopy; vibrating sample magnetometer;
Journal_Title :
Micro & Nano Letters, IET
DOI :
10.1049/mnl.2011.0715
