Fig. 4: Hysteretic friction behavior of MoS2 and h-BN.
From: Friction hysteretic behavior of supported atomically thin nanofilms

Topographic images of a unheated MoS2, d heated MoS2, g unheated h-BN and j heated h-BN samples and the corresponding height profiles (inset). Friction images of b unheated MoS2, e heated MoS2, h unheated h-BN and k heated h-BN samples. The white dashed square indicates the scanning area in the friction measurements. The load dependence of friction on c unheated MoS2, f heated MoS2, i unheated h-BN and l heated h-BN samples. The error bars in c, f, i, and l indicate the standard deviation in the mean friction force.