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
- 1 Department of Science Laboratory Technology, School of Applied Sciences, Rivers State Polytechnic Bori, Bori, Nigeria
- 2 Department of Physics, Faculty of Science, Rivers State University of Science and Technology, Nkpolu, Nigeria
- 3 Department of Physics, Faculty of Science, Rivers State University of Science and Technology, Nkpolu, Nigeria
- 4 Department of Physics and Astronomy, Western University, London, Canada
- 5 Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria
Abstract
Thin films of hematite ( α -Fe 2 O 3 ) were deposited by heteronucleation through the process of hydrolysis and condensation of an aqueous solution of 0.1 M Fe (NO 3 ) 3 .9H 2 O, 1 M NaNO 3 , 50 ml H 2 O 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.
- D. Su, H. S. Kim, W. S. Kim and G. Wang, “Synthesis of Tunable Porous Hematite ( a -Fe 2 O 3 ) for Gas Sensing and Lithium Storage in Lithium Ion Batteries,” Microporous and Mesoporous Materials, Vol. 149, 2012, pp. 36-45.
- N. N. Greenwood and A. Earnshaw, “Chemistry of the Element,” 2nd Edition, Butterworth-Heinemann, Oxford, 1997.
- A. Price, “Higher School Certificate Inorganic Chemistry,” Leslie Slater Price, 1945.
- G. Brauer, “Handbook of Preparative Inorganic Chemis try,” 2nd Edition, Academic Press, New York, Vol. 1, 1963, p. 1661.
- B. Avijit, “Pickard’s Manual of Operative Dentistry,” Oxford University Press Inc., New York, 2011, p. 89.
- A. S. Teja and P. Y. Koh, “Synthesis, Properties, and Applications of Magnetic Iron Oxide Nanoparticles,” Progress in Crystal Growth and Characterization Matte rials, Vol. 55, 2009, pp. 22-45.
- T. Marin, C. Nada, P. Matjaz, S. Zoran, M. S. Dragana and S. Vojstav, “Synthesis, Morphology, Microstructure and Magnetic Properties of Hematite Submicron Particles,” Journal of Alloys and Compounds, Vol. 509, No. 28, 2011, pp. 7639-7644.
- J. Singh, M. Srivastava, J. Dutta and P. K. Dutta, “Preparation & Properties of Hybrid Monodispersed Magnetic Fe 2 O 3 Based Chitosan Nanocomposite Film for Industrial & Biomedical Application,” International Journal of Biological Macromolecules, Vol. 48, 2011, 170-176.
- M. Mahmoudi, A. Sinchi and M. Imani, “Recent Advances in Surface Engineering of Superparamagnetic Iron Oxide Nanoparticles for Biomedical Applications,” Jour nal of the Iranian Chemical Society, Vol. 7, No. 3, 2010, pp. 1-27.
- T. E. Garcia, M. Valvo, U. Lafont, C. Munan and E. M. Kelder, “Nanostructured Fe 2 O 3 and CuO Composite Elec trodes for Li Ion Batteries,” Journal of Power Sources, Vol. 196, No. 15, 2011, pp. 6425-6432.
- J. Huang, M. Yang, C. Gu, M. Zhai, Y. Sun and J. Liu, “Hematite Solid and Hollow and Photocatalysis,” Mate rials Research Bulletin, Vol. 46, 2011, pp. 1211-1218.
- C. Hanley, A. Thurber, C. Hanna, A. Punnoose, J. H. Zhang and D. G. Wingett, “The Influences of Cell Type and ZnO Nanoparticle Size on Immune Cell Cytotoxicity and Cytokine Induction,” Nanoscale Research Letters, Vol. 4, No. 12, 2009, pp. 1409-1420.
- J. E. Greenon, “Magnetic Oxide,” John Wiley and Sons, New York, 1994.
- G. X. Wang, X. L. Gou. J. Horvat and J. Park, “Facile Synthesis and Characterization of Iron Oxide Semicon ductor Nanowires for Gas Sensing Application,” The Journal of Physical Chemistry C, Vol. 112, 2008, p. 15220.