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The influence of target stoichiometry on the surface properties of sputter deposited calcium phosphate thin films

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

O'Kane, C, Duffy, H, Meenan, BJ and Boyd, A (2008) The influence of target stoichiometry on the surface properties of sputter deposited calcium phosphate thin films. SURFACE & COATINGS TECHNOLOGY, 203 (1-2). pp. 121-128. [Journal article]

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DOI: 10.1016/j.surfcoat.2008.08.007

Abstract

A range of calcium phosphate (Ca-P) coatings have been sputter deposited at low deposition power from Ca-P targets with different phase compositions. The resultant surfaces were analysed both before and after post-deposition annealing (PDA) using X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS). The as-deposited surfaces were found to be amorphous in nature and had Ca/P ratios lower than that for their precursor target materials. After PDA at 500 degrees C, the FTIR and XRD data indicated that the coatings were all hydroxyapatite (HA) in nature. However, the Ca/P ratios were seen to increase significantly, with values above that of their starting precursor target material. It is evident that the Ca/P ratio of the different surfaces, both before and after PDA, are dependent upon the phase composition and stoichiometry of target material. This study has shown the utility of varying the precursor target material in order to modify the resultant surface conditions. (C) 2008 Elsevier B.V. All rights reserved.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:5775
Deposited By:Dr Adrian Boyd
Deposited On:04 Jan 2010 09:44
Last Modified:07 Apr 2014 14:10

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