Surface characterisation of the evolving nature of radio frequency (RF) magnetron sputter deposited calcium phosphate thin films after exposure to physiological solution

A Boyd, BJ Meenan, NS Leyland

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Abstract

The initial behaviour and ultimately the long-term performance of calcium phosphate (Ca-P) coatings for hard tissue implant applications are influenced by their dissolution properties. For this study, Ca-P coatings were deposited onto Ti-6Al-4V substrates using RF magnetron sputtering. The physico-chemical nature of these deposited layers was then determined both before and after annealing at 400 degrees C using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Furthermore, their dissolution behaviour in phosphate buffered saline (PBS) solution was also examined using similar techniques. The data shows clearly that the as-deposited coatings are amorphous when compared with the more crystalline coatings produced after annealing at 400 degrees C. These as-deposited coatings completely dissolve after exposure to the PBS for only 24 h; however, the dissolution rate of the annealed coatings is more restrained. Whereas the XPS and FTIR data show no change in the chemical nature of the annealed coatings after 30 days, the AFM results reveal subtle changes in the surface topography of the coatings after only I h of immersion. These data clearly show the utility of surface analytical techniques, such as AFM in combination with more established techniques for examining the surface properties of Ca-P coatings. Furthermore, the study also shows that calcium phosphate coatings deposited at low power using RF magnetron sputtering can undergo a decreased dissolution rate under physiological conditions they when subjected to post deposition annealing. (c) 2005 Elsevier B.V. All rights reserved.
LanguageEnglish
Pages6002-6013
JournalSurface and Coatings Technology
Volume200
Issue number20-21
DOIs
Publication statusPublished - May 2006

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calcium phosphates
radio frequencies
coatings
thin films
dissolving
atomic force microscopy
annealing
magnetron sputtering
phosphates
infrared spectroscopy
photoelectron spectroscopy
x rays
surface properties
submerging
topography

Cite this

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title = "Surface characterisation of the evolving nature of radio frequency (RF) magnetron sputter deposited calcium phosphate thin films after exposure to physiological solution",
abstract = "The initial behaviour and ultimately the long-term performance of calcium phosphate (Ca-P) coatings for hard tissue implant applications are influenced by their dissolution properties. For this study, Ca-P coatings were deposited onto Ti-6Al-4V substrates using RF magnetron sputtering. The physico-chemical nature of these deposited layers was then determined both before and after annealing at 400 degrees C using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Furthermore, their dissolution behaviour in phosphate buffered saline (PBS) solution was also examined using similar techniques. The data shows clearly that the as-deposited coatings are amorphous when compared with the more crystalline coatings produced after annealing at 400 degrees C. These as-deposited coatings completely dissolve after exposure to the PBS for only 24 h; however, the dissolution rate of the annealed coatings is more restrained. Whereas the XPS and FTIR data show no change in the chemical nature of the annealed coatings after 30 days, the AFM results reveal subtle changes in the surface topography of the coatings after only I h of immersion. These data clearly show the utility of surface analytical techniques, such as AFM in combination with more established techniques for examining the surface properties of Ca-P coatings. Furthermore, the study also shows that calcium phosphate coatings deposited at low power using RF magnetron sputtering can undergo a decreased dissolution rate under physiological conditions they when subjected to post deposition annealing. (c) 2005 Elsevier B.V. All rights reserved.",
author = "A Boyd and BJ Meenan and NS Leyland",
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N2 - The initial behaviour and ultimately the long-term performance of calcium phosphate (Ca-P) coatings for hard tissue implant applications are influenced by their dissolution properties. For this study, Ca-P coatings were deposited onto Ti-6Al-4V substrates using RF magnetron sputtering. The physico-chemical nature of these deposited layers was then determined both before and after annealing at 400 degrees C using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Furthermore, their dissolution behaviour in phosphate buffered saline (PBS) solution was also examined using similar techniques. The data shows clearly that the as-deposited coatings are amorphous when compared with the more crystalline coatings produced after annealing at 400 degrees C. These as-deposited coatings completely dissolve after exposure to the PBS for only 24 h; however, the dissolution rate of the annealed coatings is more restrained. Whereas the XPS and FTIR data show no change in the chemical nature of the annealed coatings after 30 days, the AFM results reveal subtle changes in the surface topography of the coatings after only I h of immersion. These data clearly show the utility of surface analytical techniques, such as AFM in combination with more established techniques for examining the surface properties of Ca-P coatings. Furthermore, the study also shows that calcium phosphate coatings deposited at low power using RF magnetron sputtering can undergo a decreased dissolution rate under physiological conditions they when subjected to post deposition annealing. (c) 2005 Elsevier B.V. All rights reserved.

AB - The initial behaviour and ultimately the long-term performance of calcium phosphate (Ca-P) coatings for hard tissue implant applications are influenced by their dissolution properties. For this study, Ca-P coatings were deposited onto Ti-6Al-4V substrates using RF magnetron sputtering. The physico-chemical nature of these deposited layers was then determined both before and after annealing at 400 degrees C using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Furthermore, their dissolution behaviour in phosphate buffered saline (PBS) solution was also examined using similar techniques. The data shows clearly that the as-deposited coatings are amorphous when compared with the more crystalline coatings produced after annealing at 400 degrees C. These as-deposited coatings completely dissolve after exposure to the PBS for only 24 h; however, the dissolution rate of the annealed coatings is more restrained. Whereas the XPS and FTIR data show no change in the chemical nature of the annealed coatings after 30 days, the AFM results reveal subtle changes in the surface topography of the coatings after only I h of immersion. These data clearly show the utility of surface analytical techniques, such as AFM in combination with more established techniques for examining the surface properties of Ca-P coatings. Furthermore, the study also shows that calcium phosphate coatings deposited at low power using RF magnetron sputtering can undergo a decreased dissolution rate under physiological conditions they when subjected to post deposition annealing. (c) 2005 Elsevier B.V. All rights reserved.

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