Biomedical Engineering Reference
In-Depth Information
50
Number of adherent platelets
Percentage of unactivated platelets
100
40
80
30
60
20
40
10
20
0
0
As-
200
°
C
300
°
C
400
°
C
500
°
C
600
°
C
deposited
Temperature (
°
C)
FIGURE 19.40
Quantity of platelets adhered on the surface of the a-C:H fi lms annealed at different tem-
peratures (15 min incubation in PRP). (From Yang, P. et al.,
Surf. Coating Tech
., 177-178, 747, 20 0 4. Wit h
permission.)
FIGURE 19.41
Optical micrograph of the surface of P-doped DLC. (From Kwok, S.C.H. et al.,
Diam. Relat.
Mater.
, 14, 78, 2005. With permission.)
the band gap of fi brinogen), order-of-magnitude increase of the carrier concentration, and of p-type
conductivity. Hence, the blood compatibility of a-C:H fi lms is affected by the electronic structure
and improving the electronic structure is important for the abatement of platelet activation.
19.5.1.4 Infl uence of Elemental Doping on Film Characteristics
19.5.1.4.1 Phosphorus-doped DLC fi lms (P-DLC)
Phosphorus, which is commonly found in inorganic phosphate rocks and in all living cells, is one
of the essential elements in biological system. In this study, DLC fi lms were fi rstly fabricated using
acetylene gas in PIIID. Subsequent phosphorus implantation was conducted in the same vacuum
chamber using high-voltage glow discharge so as to prepare P-doped DLC.
