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Hydroxyapatite films obtained by sol-gel and sputtering
Hydroxyapatite (HA) biocoatings were obtained using two different deposition methods: sol-gel and sputtering. A direct comparison of films obtained using different techniques is necessary because of possible formation of multi-phases and components in HA films. HA films were investigated using spectroscopic ellipsometry (SE) as a powerful method to evaluate composition and structural properties of the films. For both types of films, sputtering and sol-gel, a weak dispersion of the refractive index within the wavelength range 0.4-0.7 μm was found. This corresponds to a high energy bandgap and a high optical transparency in the UV-VIS range. The internal porosity varying in a wide range in the sol-gel films was evaluated using a modeling of SE data. Additionally to SE studies, structural, chemical and optical characterizations of the films were performed using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). Two absorption bands observed in the wavelength ranges 550-600 cm-1 and 1000-1200 cm-1 can be attributed to the major absorption modes associated with HA in agreement with published data. From XPS analysis, the atom ratio Ca/P was found for sol-gel films close to the stoichiometric value 1.67. For sputtering films, a higher Ca/P ratio of about 2.1 was estimated. However, similar FTIR spectra have been recorded for both sputtering and sol-gel films. XRD studies show also similar crystallization c
Elsevier Science
Type du document
Conférence : Current Trends in Optical and X-Ray Metrology of Advanced Materials and Devices II. Symposium H, Warsaw, POL, 2007-09-17
ISSN : 0040-6090 CODEN : THSFAP
Thin solid films A. 2008, vol. 516, n° 22, pp. 8112-8116 [5 pages] [bibl. : 20 ref.]
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