High friction of a vertically aligned carbon-nanotube film in microtribology

Kinoshita, Hiroshi; Kume, Ippei; Tagawa, Masahito; Ohmae, Nobuo
October 2004
Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2780
Academic Journal
The frictional behavior of a vertically aligned carbon-nanotube (VACNT) film against gold tips was studied in air. In these experiments, the film was 6 μm thick, the tip radii 4.5–30 μm, the applied forces smaller than 5 μN, and speeds were 0.15–24 μm/s. In spite of the null adhesion force to the gold tip, extremely high friction coefficients of 1.0–2.2 were found for the VACNT film. No dependence of friction on speed or tip radius was observed.


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