  Thin films of uniformly distributed Fe2O3 nanoparticles have been prepared on
single crystal silicon and glass substrates by a spray pyrolysis technique in a
single step using a mixture of water and ferrocene dissolved in xylene. The
size distribution of nanoparticles is found to be in the range of 20 nm to 30
nm. The films have been characterized by X-ray diffraction, scanning electron
microscopy and Raman spectroscopy techniques. The uniformity of the grown film
was evident from the electron microscopic images on both the substrates. The
crystallinity and band gap were investigated using X-ray diffraction and
absorption spectroscopy respectively. Raman measurements of the prepared films
have been carried out using two excitation wavelengths of 633 nm and 785 nm to
investigate the depth of homogeneity of the films. The wavelength dependent
Raman measurements reveal that the film is uniform across the thickness of the
film on both the substrates.
