Figure 4.

The MoS2 nanotube 170 nm in diameter. (a) Topography taken at 3 nN with marked area of friction testing and (b) friction results as a function of angle between the scan direction and the nanotube's axis.

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