Abstract
This investigation was conducted on the surface modification of various carbon materials by R.F. glow discharge plasmas with the aim of investigating the difference of the surface treatment effects due to the structural disparity of the carbon materials with the reactive plasma. The surfaces of carbon materials, which were glassy carbon (GC) and artificial graphite (AG), were treated by O2 plasma or Ar plasma. The contact angles for water to each carbon surface after the plasma treatment were measured. And their surfaces were analyzed by using Raman spectroscopy and ESCA. Also, we observed them by SEM. Plasma treatment makes the two carbon materials hydrophilic. The contact angle decreased from 79.5° to 5° by O2 plasma(GC, input power: 30W) and from 80.7° to 31° by Ar plasma(GC, input power: 30W). The contact angle decreased from 120.5° to 7° by O2 plasma(AG, input power: 30W) and from 120° to 27° by Ar plasma(AG, input power: 30W). It is considered that the plasma treatment effects increase in case that the volume of the edge carbon, which has graphite-like layer, is large.
