The structural analysis and rotational stacking faults of few-layer graphene sheets, derived by the controlled pyrolysis of solid botanical camphor, were reported. The second-order Raman spectra of the sheets showed that the graphene layers were more than one single layer, and the numbers of layers can be controlled by adjusting the amount of camphor pyrolyzed. Transmission electron microscopy images show a minimum of 3 layers for thinner graphene sheets and a maximum of 12 layers for thicker graphene sheets. Low-voltage aberration-corrected high-resolution transmission electron microscopy was also carried out to gain insight into the hexagonal structure and stacking of graphene layers. The transmission electron microscopy study showed the presence of moiré patterns with a relative rotation between graphene layers.

Structural Analysis and Direct Imaging of Rotational Stacking Faults in Few-Layer Graphene Synthesized from Solid Botanical Precursor. G.Kalita, K.Wakita, M.Umeno: Japanese Journal of Applied Physics, 2011, 50[7], 070106