Hide/Show Apps

Characterization of nanostructured magnetite thin films produced by sol-gel processing

2009-06-01
Eken, Ali Erdem
Özenbaş, Ahmet Macit
Nanocrystalline films of magnetite have been prepared by a novel sol-gel route in which, a solution of iron (III) nitrate dissolved in ethylene glycol was applied on glass substrates by spin coating. Coating solution showed Newtonian behaviour and viscosity was found as 0.0215 Pa.s. Annealing temperature was selected between 291 and 350 A degrees C by DTA analysis in order to obtain magnetite films. In-plane grazing angle XRD and TEM studies showed that magnetite phase was present upon annealing the films at 300 A degrees C. The films had crack free surfaces and their thicknesses varied between similar to 10 and 200 nm. UV-Vis spectrum results showed that transmittance of the films increases with decreasing annealing temperature and increasing spinning rate. Up to 96% transmittance was observed between the wavelengths of 900-1,100 nm. Vibrating sample magnetometer measurements indicated that magnetite thin films showed ferromagnetic behavior and the saturation magnetization value was found as similar to 35 emu/cm(3).