Control of composition and crystallinity in hydroxyapatite films deposited by electron cyclotron resonance plasma sputtering

Akazawa, Housei; Ueno, Yuko

doi:10.1016/j.jpcs.2013.08.014

Cited by 15 publications

(21 citation statements)

References 58 publications

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“…Crack-free ACP deposits of 300 -500 nm thick with smooth morphologies were manufactured at room temperature, which were transformed into HA deposits after annealing in presence of oxygen [266]. However, crack-free HA deposits of high hardness and the specific crystallographic orientations were manufactured when Xe gas was used and Si (100) substrates were heated to 450 -500 °C from their rear [267]. Similar results were obtained for sapphire substrates [268].…”

Section: Accepted Manuscriptmentioning

confidence: 53%

“…A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 18 To sputter materials, several types of the techniques are used, such as: ion beam [216][217][218][219][220][221][222][223][224][225][226], radio-frequency (RF) magnetron [227-244k], pulsed laser [58,75,232,, electroncyclotron-resonance plasma [266][267][268], diode, direct current and reactive sputtering or deposition [269,270]. However, since CaPO 4 belong to the electrically insulating materials, the last three techniques cannot be used for their spattering.…”

Section: Vapor Deposition Techniquesmentioning

confidence: 99%

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Calcium orthophosphate deposits: Preparation, properties and biomedical applications

Dorozhkin¹

2015

Materials Science and Engineering: C

257

140

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Section: Accepted Manuscriptmentioning

confidence: 53%

Section: Vapor Deposition Techniquesmentioning

confidence: 99%

Calcium orthophosphate deposits: Preparation, properties and biomedical applications

Dorozhkin¹

2015

Materials Science and Engineering: C

257

140

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“…The textural index R by Low [26] and the textural degree index DR indicate that the HAPs in bones of Cololabis saira have a strong (47-96%) preferring orientation along the crystallographic c-axis. The preferring orientation of biominerals is determined by the function of the hard tissue [38], it makes the physical properties the best anisotropism in nano-size [39] and possesses the lowest surface free energy [40] and can resist the damage from the outside [41]. During the biomineralization, HAPs are controlled strictly by organic molecules and prefer orientation along the crystallographic c-axis nearly parallel to the collagen fibers' axis [42,43].…”

Section: Orientation Of Hapmentioning

confidence: 99%

Crystallographic Characteristics of Hydroxylapatite in Hard Tissues of Cololabis saira

Wang

Yuan

2017

Crystals

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X-ray micro diffractometry, transmission electron microscopy, environmental scanning electron microscopy, energy dispersive spectrometry and Fourier transform infrared were employed to investigate the crystallographic characteristics of the inorganic mineral existing in bones of Cololabis saira. The results show that the crystal phase in hard tissues of Cololabis saira is hydroxylapatite (HAP). Chemical composition analysis reveals that the HAP in hard tissues lacks P and is rich in Ca. Refined lattice parameters of HAP show that a = 0.93622-0.93787 nm and c = 0.68549-0.69011 nm. The domain sizes calculated from the Scherrer equation are 18.9-20.7 nm long along the c-axis and about 6.2 nm thick perpendicular to the c-axis, and is well evidenced by TEM data. The crystallinity of HAP is poor compared with natural HAP. In situ X-ray micro diffraction patterns measured from raw hard tissue show a very strong reflection from the (002) and (004) lattice planes on the cross-section of bone and nearly no reflection from the (002) and (004) lattice planes on elongation surface of bone. Compared with the XRD pattern of standard HAP data and from the textural index R values, it indicates that the HAP in the hard tissues of Cololabis saira has a strong preferring orientation along the crystallographic c-axis. This is verified by Fourier transform infrared on the elongation surface of bone and by selected area electron diffraction of HRTEM on the section perpendicular to elongation of bone. A quantitative textural degree index DR is proposed. The crystallographic characteristics of bio-hydroxylapatites (particle size, crystallinity and preferring orientation) are designed by tissue function and controlled by organic matrix to provide a good mechanical performance.

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“…HA has been used as a bioactive coating to improve the osteoconductivity of metallic implants. In addition to plasma spray deposition, a large number of coating techniques have been proposed for HA deposition on titanium implants, such as the sol-gel process [3], electrodeposition [4], pulsed laser deposition (PLD) [5], electron and ion beam deposition [6,7], electroncyclotron-resonance (ECR) [8], and radio-frequency magnetron sputtering (RFMS) [9].…”

Section: Introductionmentioning

confidence: 99%

“…However, it is difficult to produce a thin coating without the formation of undesirable and amorphous phases [12][13][14][15][16]. Coatings are generally treated at temperatures of up to 900°C to transform amorphous phases into HA [8,15,16]. However, this thermal treatment may produce undesirable phases such as tricalcium phosphate (α,β -TCP) and calcium oxide (CaO) and cause the coatings to crack [6,8,12,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Crystalline nano-coatings of fluorine-substituted hydroxyapatite produced by magnetron sputtering with high plasma confinement

López

Rossi

Archanjo

et al. 2015

Surface and Coatings Technology

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a b s t r a c tA radio-frequency magnetron sputtering technique operating in right-angle geometry (RAMS) with high plasma confinement was revised to produce thin films (15-570 nm) of fluorine-substituted hydroxyapatite, FHA, adapted to be used as nano-coatings for biomedical implants. An electron temperature of T eff ≈ 9.0 eV and a plasma electron density of 1.2 × 10 15 m −3 assured the nucleation of an amorphous fluorine-substituted hydroxyapatite phase on Si and Ti surfaces. With the aid of a Langmuir probe, the RAMS plasma energy was tuned to control the coating stoichiometry and the ratio between the crystalline and amorphous phases. The energy delivered over time from the bombardment of ions and electrons transformed the amorphous calcium phosphate phase into crystalline fluorine-substituted hydroxyapatite. The crystalline films were obtained at room temperature. The partial substitution of OH − for F − in the HA structure was confirmed by X-ray diffraction using synchrotron radiation in grazing-incidence mode, X-ray photoelectron spectroscopy and attenuated total reflection Fourier transform infrared spectroscopy. High-resolution transmission electron microscopy carried out on crosssection film samples prepared by a focused ion beam (FIB) technique revealed that the film ultrastructure was composed of columnar crystals oriented perpendicularly to the substrate surface. The crystals were connected to the substrate surface by ordered nanolayers, indicating the existence of a continuous binding between the two materials. This work demonstrates that the RAMS technique is able to produce FHA nano-coatings with controlled chemical compositions and structures on metallic implants for clinical applications.

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Control of composition and crystallinity in hydroxyapatite films deposited by electron cyclotron resonance plasma sputtering

Cited by 15 publications

References 58 publications

Calcium orthophosphate deposits: Preparation, properties and biomedical applications

Calcium orthophosphate deposits: Preparation, properties and biomedical applications

Crystallographic Characteristics of Hydroxylapatite in Hard Tissues of Cololabis saira

Crystalline nano-coatings of fluorine-substituted hydroxyapatite produced by magnetron sputtering with high plasma confinement

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