Abstract
C60 treatment at 5–8 GPa, ∼1000 °C results in the fullerene cage collapse and transformation to a phase with outstanding mechanical properties. A detailed structural analysis of the phase reveals that it comprised 7–12 layer graphene clusters with lateral dimension of 2–4 nm. Raman spectra of the nanoclustered graphene phase are similar to those of disordered sp2 carbon structure with an admixture of sp3-bonded carbon. The phase is characterized by a high (up to 19 GPa) hardness, relatively low (about 70 GPa) Young modulus and up to 95% elastic recovery, determining excellent wear resistance and good antifriction properties.
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