Annealing Effect on the Solid State and Optical Properties of αFe2O3 Thin Films Deposited Using the Aqueous Chemical Growth ACG MethodReportar como inadecuado




Annealing Effect on the Solid State and Optical Properties of αFe2O3 Thin Films Deposited Using the Aqueous Chemical Growth ACG Method - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Thin films of hematite α-Fe2O3 were deposited by heteronucleation through the process of hydrolysis and condensation of an aqueous solution of 0.1 M Fe NO33.9H2O, 1 M NaNO3, 50 ml H2O in addition with five drops of HCl at 90℃. One of the samples was kept as prepared while the others were annealed at different temperatures in order to determine the effect of annealing on their solid state and optical properties. The films were characterized using Rutherford Back Scattering RBS, spectroscopy for chemical composition and thickness, X-Ray Diffraction XRD for structural analysis, UV-VIS Spectrophotometer for the analysis of other solid state and optical properties and a photomicroscope for photomicrographs. The results indicate that while the absorbance and absorption coefficient decreases with increasing annealing temperature, the direct band gap and refractive index increases with increasing annealing temperature in the direction of increasing photon energy in the visible range. Also, there is a high infrared transmittance which increases with increasing annealing temperature and a shift-decrease in peak value of all the optical properties except transmittance in the direction of increasing photon energy as annealing temperature increases. The results further indicate that ACG hematite thin film annealed at 632K is a suitable metal oxide semiconductor material for photocatalytic applications. It is also suitable for use in the construction of poultry houses for the rearing of chicks because of its high infrared transmittance including other opto-electronic applications.

KEYWORDS

Aqueous Chemical Growth; αFe2O3; RBS; XRD; Optical Properties

Cite this paper

S. Mammah, F. Opara, F. Sigalo, S. Ezugwu and F. Ezema -Annealing Effect on the Solid State and Optical Properties of αFe2O3 Thin Films Deposited Using the Aqueous Chemical Growth ACG Method,- Materials Sciences and Applications, Vol. 3 No. 11, 2012, pp. 793-801. doi: 10.4236-msa.2012.311115.





Autor: S. L. Mammah, F. E. Opara, F. B. Sigalo, S. C. Ezugwu, F. I. Ezema

Fuente: http://www.scirp.org/



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