J. Mater. Sci. Technol. ›› 2015, Vol. 31 ›› Issue (1): 1-9.DOI: 10.1016/j.jmst.2014.11.011

• Orginal Article •     Next Articles

Size Dependent Physical Properties of Nanostructured α-Fe2O3 Thin Films Grown by Successive Ionic Layer Adsorption and Reaction Method for Antibacterial Application

A.U. Ubale1, *, M.R. Belkhedkar1, 2   

  1. 1 Nanostructured Thin Film Materials Laboratory, Department of Physics, Govt. Vidarbha Institute of Science and Humanities, VMV Road, Amravati 444604, Maharashtra, India; 2 Department of Physics, Shri Shivaji College, Akola 444003, Maharashtra, India
  • Received:2014-04-08 Online:2015-01-20 Published:2015-07-23
  • Contact: * Corresponding author. Ph.D.; Tel.: +91 721 2531706; Fax: +91 7212531705; E-mail address: ashokuu@yahoo.com (A.U. Ubale).
  • Supported by:
    The authors are thankful to University Grants Commission, New Delhi (India), for financial support under the project.

Abstract: Thin films of nanostructured α-Fe2O3 with thickness of 156, 203 and 251 nm were deposited by successive ionic layer adsorption and reaction (SILAR) method onto glass substrates using FeCl3·6H2O and NaOH as cationic and anionic precursors. The X-ray diffraction studies revealed that, α-Fe2O3 thin films are nanocrystalline in nature with rhombohedral structure. The morphological properties were investigated by field emission scanning electron and atomic force microscopy. The optical studies showed that α-Fe2O3 exhibits direct as well as indirect optical band gap energy. The electrical resistivity of α-Fe2O3 at 305 K decreases from 11.76 × 102 to 9.46 × 102 Ω cm as film thickness increases from 156 to 251 nm. The thermo-emf measurements confirmed that α-Fe2O3 exhibits n-type conductivity. The nanocrystalline α-Fe2O3 exhibits antibacterial character against Staphylococcus aureus and its efficiency increases from 37.50% to 87.50% depending on crystallite size.

Key words: Thin films, Nanostructures, AFM (atomic force microscopy), Physical properties, Antibacterial efficiency