Fig. 2From: Sliding Speed-Dependent Tribochemical Wear of Oxide-Free SiliconSi wear as a function of sliding speed under dry air. Topography of the wear region (a). Volume of hillocks on Si surface formed after 100 sliding cycles in vacuum (b). Imposed load is 2 μN, and sliding amplitude is 200 nm. Inset in (b) shows the diagram of the cross-section profile of a hillockBack to article page