▎ 摘　　要

Few-layer graphene has been achieved in liquid dispersion from graphite by the assistance of titanosilicate JDF-L1, using ultrasound and methanol as dispersive media. After a sedimentation step, both the dispersed and the sedimented phases were collected and then the titanosilicate was removed by alkaline hydrothermal dissolution from the mixed materials to obtain few-layer graphene (FLG) and sedimented material, respectively. The production of smaller particles was confirmed by means of N-2 adsorption and zetapotential measurements, so that the BET specific surface area increased from 20 m(2)/g of the raw graphite to 333 +/- 22 m(2)/g in FLG. Raman spectroscopy shows a decrease in the ratio of intensities of the peaks G and 2D from 3.8 in the raw material to 2.5 in FLG. Particles as fine as 1.3 nm, corresponding to 4-layered FLG, were observed by AFM, while highresolution TEM showed defect-free regions of graphene. (C) 2014 Elsevier Ltd. All rights reserved.