Fig. 4From: Sliding Speed-Dependent Tribochemical Wear of Oxide-Free SiliconAFM images and the corresponding cross-section profiles of wear scars on amorphous silica surface formed after sliding 200 cycles (a) and 2000 cycles (b). Relative humidity (RH) was 60%, imposed load was 2 μN, sliding amplitude was 200 nm, and the sliding speed was 0.8 μm/sBack to article page