Abstract

Hydrogenated carbon films were grown by a plasma-enhanced chemical vapor deposition (PECVD) techniqueusing CH4 and H2 as feedstock at ambient temperature. The microstructure of the films was characterized byhigh resolution transmission electron microscopy (HRTEM). The images showed thepresence of curved basal planes in fullerene-like arrangements. An apparent amorphousgraphene structure with nm-sized packages of basal planes in a turbostratic feature wasobserved. The fabricated fullerene-like hydrogenated carbon films (FL–C:H) possesssuperior mechanical properties, i.e. high hardness (19 GPa) and high elasticity(elastic recovery of 85%). More importantly, the films exhibit ultra-low friction(μ = 0.009) under ambient conditions with 20% relative humidity.

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