Figure 3.

AFM images of three MoS2 nanotubes. There is low interaction strength between the nanotubes and underlying HOPG substrate and the corresponding values of COF with marked areas of the friction measurements; scale bars = 500 nm. (a) A kink of the tube, 200 nm in diameter (trace image), COF (0.018 ± 0.004); (b) the nanotube, 14 nm in diameter, laid over surface steps, COF (0.022 ± 0.005); (c) partially detached nanotube, 110 nm in diameter, with the line profile A (inset), COF (0.033 ± 0.001); and (d) the same nanotubes put into contact with substrate with the line profile B (inset), COF (0.057 ± 0.01).

Jelenc and Remskar Nanoscale Research Letters 2012 7:208   doi:10.1186/1556-276X-7-208
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