RefDoc
Haut

Faire une nouvelle recherche
Make a new search
Lancer la recherche


Titre du document / Document title

Hydroxyapatite films obtained by sol-gel and sputtering

Auteur(s) / Author(s)

STOICA T. F. (1) ; MOROSANU C. (1) ; SLAV A. (1) ; STOICA T. (1) ; OSICEANU P. (2) ; ANASTASESCU C. (2) ; GARTNER M. (2) ; ZAHARESCU M. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) National Institute of Materials Physics, P.O. Box Mg. 7, 76900 Bucharest, Magurele, ROUMANIE
(2) Institute of Physical Chemistry of the Romanian Academy of Sciences, Splaiul Independentei 202, 77208 Bucharest, ROUMANIE

Résumé / Abstract

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 conditions by annealing at temperatures higher than 500 °C.

Revue / Journal Title

Thin solid films    ISSN  0040-6090   CODEN THSFAP 

Source / Source

Congrès
Current Trends in Optical and X-Ray Metrology of Advanced Materials and Devices II. Symposium H, Warsaw , POLOGNE (17/09/2007)
2008, vol. 516, no 22 (269 p.)  [Document : 5 p.] (20 ref.), [Notes: Selected papers], pp. 8112-8116 [5 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Amsterdam, PAYS-BAS  (1967) (Revue)

Mots-clés anglais / English Keywords

Thermal annealing

;

Crystallization

;

Absorption band

;

XRD

;

X-ray photoelectron spectra

;

Transparent material

;

Hydroxyapatite

;

Fourier transform spectroscopy

;

Crystal structure

;

Theoretical study

;

Modelling

;

Porosity

;

Energy gap

;

High energy

;

Optical properties

;

Refractive index

;

Dispersions

;

Spectroscopic ellipsometry

;

Sputtering

;

Sol-gel process

;

Thin films

;

Mots-clés français / French Keywords

7866

;

8115C

;

8115L

;

Recuit thermique

;

Cristallisation

;

Bande absorption

;

Diffraction RX

;

Spectre photoélectron RX

;

Matériau transparent

;

Apatite hydroxylée

;

Spectrométrie transformée Fourier

;

Structure cristalline

;

Etude théorique

;

Modélisation

;

Porosité

;

Bande interdite

;

Haute énergie

;

Propriété optique

;

Indice réfraction

;

Dispersion

;

Ellipsométrie spectroscopique

;

Pulvérisation irradiation

;

Procédé sol gel

;

Couche mince

;

Mots-clés espagnols / Spanish Keywords

Recocido térmico

;

Banda absorción

;

Material transparente

;

Hidroxiapatito

;

Alta energía

;

Elipsometría espectroscópica

;

Mots-clés d'auteur / Author Keywords

Hydroxyapatite

;

Sol-gel and sputtering

;

Thin films

;

Crystalline structure

;

Optical properties

;

Localisation / Location

INIST-CNRS, Cote INIST : 13597, 35400018532011.0250

Nº notice refdoc (ud4) : 20787662



Faire une nouvelle recherche
Make a new search
Lancer la recherche
Bas