Annealing Effect on the Solid State and Optical Properties of <i>α</i>Fe<sub>2</sub>O<sub>3</sub>Thin Films Deposited Using the Aqueous Chemical Growth (ACG) Method
Annealing Effect on the Solid State and Optical Properties of <i>α</i>Fe<sub>2</sub>O<sub>3</sub>Thin Films Deposited Using the Aqueous Chemical Growth (ACG) Method作者机构：Department of Physics and Astronomy University of Nigeria Nsukka Nigeria Department of Physics and Astronomy Western University London Canada Department of Physics Faculty of Science Rivers State University of Science and Technology Nkpolu Nigeria Department of Science Laboratory Technology School of Applied Sciences Rivers State Polytechnic Bori Bori Nigeria
出 版 物：《Materials Sciences and Applications》 (材料科学与应用期刊（英文）)
年 卷 期：2012年第3卷第11期
页 面：793-801页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Aqueous Chemical Growth αFe2O3 RBS XRD Optical Properties
摘 要：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 (NO3)3.9H2O, 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.
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