Blood compatibility and sp3/sp2 contents of diamond-like carbon (DLC) synthesized by plasma immersion ion implantation-deposition

被引:115
作者
Chen, JY
Wang, LP
Fu, KY
Huang, N
Leng, Y
Leng, YX
Yang, P
Wang, J
Wan, GJ
Sun, H
Tian, XB
Chu, PK
机构
[1] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China
[2] SW Jiaotong Univ, Dept Mat Engn, Chengdu 610031, Peoples R China
[3] Hong Kong Univ Sci & Technol, Dept Engn Mech, Kowloon, Hong Kong, Peoples R China
关键词
plasma immersion ion implantation-deposition; diamond-like carbon (DLC) film; microstructures; blood compatibility;
D O I
10.1016/S0257-8972(02)00089-0
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Diamond-like carbon (DLC) is an attractive biomedical material due to its high inertness and excellent mechanical properties. Using plasma immersion ion implantation-deposition (PIII-D), DLC films are fabricated on silicon substrates at room temperature. By changing the C2H2 to Ar (F-C2H2/F-Ar) flow ratio during deposition, the effects of the reactive gas pressure and flow ratio on the characteristics of the DLC films are systematically examined to correlate to the blood compatibility. The thickness, surface morphology, composition, structure, sp(3)/sp(2) content, as well as carbon-hydrogen bonding are studied using alpha-step profilometry, atomic force microscopy (AFM), Rutherford backscattering spectrometry (RBS), Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR), respectively. The blood compatibility of the film is evaluated using in vitro platelet adhesion investigation, and the quantity and morphology of the adherent platelets are investigated employing optical microscopy and scanning electron microscopy (SEM). The Raman D-band to G-band intensity ratio is consistent with the adherent platelet quantity. Both first increase and then decrease with higher F-C2H2/F-Ar flow ratios. This implies that the blood compatibility of the DLC films is influenced by the ratio of sp(3) to sp(2), not by the absolute sp(3) or sp(2) content, Our study suggests that DLC films with the proper sp(3) to sp(2) ratio and good blood compatibility can be fabricated by C2H2-Ar PIII-D using a suitable C2H2/Ar gas ratio. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:289 / 294
页数:6
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