Preparation of graphene by exfoliation of
201257 ensp 0183 enspMultilayered graphite nanosheets with a thickness of 30 to 80 nm were dispersed into N Ndimethylformamide DMF and exfoliated by shearforcedominated ball milling carried out in a planetary mill After highspeed centrifugation irregular shaped single and fewlayer graphene sheets 3 layers having a thickness around 0 8–1 8 nm were found from the supernatant