Raman study of nanoparticle-template interaction in a CoFe2O4/SiO2-based nanocomposite prepared by sol–gel method

The thermal stability of maghemite-silica nanocomposites: An investigation using X-ray diffraction and Raman spectroscopy

“…4. The Raman spectra of the LW composite sample heated up to 900 • C is dominated by the 490 cm −1 band, attributed to the O 3 SiOH stretching modes of the silica matrix defects [19]. However, broad Raman bands around 360 and 700 cm −1 , attributed to the Fe-O stretching modes of the maghemite phase are also present [20].…”

Raman spectroscopy of cobalt ferrite nanocomposite in silica matrix prepared by sol–gel method

“…In the nanocomposite samples containing high concentration of nanoparticles and annealed at lower temperatures the nanoparticles inhibits the Si-O-Si bond formation, harming the structure of the silica matrix network, thus reducing the intensity of silica matrix characteristic Raman bands. Further, when the annealing temperature increases the presence of the nanoparticles breaks Si-O-Si bonds in the silica matrix network and promotes the formation of Si-O-Fe (Co) bonds [12][13][14], thus explaining the increase of the intensity of the peak around 690 cm À1 . This finding evidences the key role played by the nanoparticle/silica matrix network interaction.…”

Morphology of cobalt ferrite nanoparticle–polyelectrolyte multilayered nanocomposites

“…For example, superparamagnetic iron oxide (SPIO) particles have been employed as main components in magnetic nanocomposite films. When prepared as stable colloidal dispersions [9] they can be incorporated within both organic or inorganic templates, including polymers, silica, and porous materials [10][11][12][13]. The resulting nanocomposites exhibit most the magnetic properties of the iron oxide system.…”