Title :
Calcium doped diamond-like carbon films fabricated by plasma immersion ion implantation
Author :
Kwok, S.C.H. ; Chu, Paul K. ; Bilek, M.M.M. ; McKenzie, D.R.
Author_Institution :
Dept. of Phys. & Mater. Sci., City Univ. of Hong Kong, China
Abstract :
Summary form only given. Diamond like carbon (DLC) films have been computationally used as protective coatings for many purposes and doping of DLC films has been shown to enhance certain tribological properties. However, doping is a relatively novel approach with respect to the modification of the surface biomedical properties of DLC films. In the work reported here, we implanted a biological friendly element, calcium, into DLC using plasma immersion ion implantation (PIII) to enhance its surface biocompatibility. Calcium is also an important element in bones and calcium-doped DLC may be potentially useful in orthopedic applications. Acetylene gas (C/sub 2/H/sub 2/) was initially used to synthesize the hydrogenated amorphous carbon films by PIII, and subsequent calcium implantation was conducted in the same machine. Calcium has a high boiling point (1484/spl deg/C at 1 atmospheric pressure) and is chemically reactive in air. Therefore, in our work, we designed a special ion source. The Ca powder was evaporated utilizing electron bombardment and the calcium plasma was produced by pulsed high-voltage glow discharge. The film properties were characterized by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and Fourier transform infrared spectroscopy (FTIR). With regard to the hemo-compatibility, platelet adhesive tests were performed. The Ca-implanted DLC films exhibit enhanced biomedical properties and the details will be discussed in this paper.
Keywords :
Fourier transform spectra; Raman spectra; X-ray photoelectron spectra; adhesion; biomedical materials; calcium; diamond-like carbon; infrared spectra; ion sources; plasma deposition; plasma immersion ion implantation; protective coatings; thin films; 1 atm; 1484 degC; C:Ca; Ca implanted DLC films; Ca powder; FTIR spectra; Fourier transform infrared spectra; PIII; Raman spectra; X-ray photoelectron spectra; XPS; biomedical properties; bones; calcium doped DLC films; calcium doped diamond-like carbon films; calcium implantation; calcium plasma; electron bombardment; hemocompatibility; hydrogenated amorphous carbon films; orthopedic application; plasma immersion ion implantation; platelet adhesive tests; protective coatings; pulsed high-voltage glow discharge; surface biocompatibility; surface biomedical properties; tribological properties; Biology computing; Biomedical computing; Calcium; Coatings; Diamond-like carbon; Doping; Plasma immersion ion implantation; Protection; Raman scattering; Spectroscopy;
Conference_Titel :
Plasma Science, 2004. ICOPS 2004. IEEE Conference Record - Abstracts. The 31st IEEE International Conference on
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-8334-6
DOI :
10.1109/PLASMA.2004.1340077