412482.fig.001a
412482.fig.001b
412482.fig.001c
Figure 1: SEM images showing the surface topography of the samples (a) glow discharge cleaned and thermally oxidized sample. Bar = 5 μm; (b) glow discharge cleaned and nitrided sample. Bar = 5 μm; (c) hydrogen peroxide treated sample. Bar = 2 μm.