Mechanical thinning to make few-layer graphene from pencil lead

Microwave synthesis of large few-layer graphene sheets in aqueous solution of ammonia

“…We show that graphene material with relatively high quality, i.e., low oxygen decoration and large size, can be prepared in high yields by microwave treatment of expanded graphite in aqueous solution of ammonia at low temperatures (below 200 °C ). In a previous paper, we have reported that FLG sheets could be produced by catalytic unzipping of carbon nanotubes in water under microwave irradiation [12], although the resulting FLG possessed a relatively high amount of oxygenated functional groups on its surface. In the present work, water is replaced by ammonia which displays a higher reducibility and hence may prevent the incorporation of oxygenated groups into the synthesized FLG.…”

“…Very recently, four new methods have been reported for unzipping a carbon nanotube lengthways [3,[11][12][13][14]. One method is based on the use of strong oxidizing reagents, e.g., H 2 SO 4 /KMnO 4 , whilst a second one uses the parallel insertion of metal atoms, e.g., Li, in the presence of liquid ammonia followed by a thermal treatment.…”

New functional nanocomposites based on poly(trimethylene 2,5-furanoate) and few layer graphene prepared by in situ polymerization

“…Few layer graphene (FLG) was prepared by a modified method based on mechanical exfoliation (ablation) of graphite materials previously reported [49]. The modification of the method concerns initial graphite-based materials.…”

Nanodiamond decorated few-layer graphene composite as an efficient metal-free dehydrogenation catalyst for styrene production

“…However, it is worthy to note that the NDs dispersion on FLG surface is somewhat lower than that on GO surface [20]. Such lower dispersion could be attributed to the presence of a lower density of defect on the FLG synthesized by the present method compared to the GO or FLG synthesized by mechanical ablation or microwaves assisted sonication process [17,21].…”

“…Highresolution TEM analysis indicates the presence of vacancies and defects on the FLG surface which provide anchorage sites for the active phase dispersion and stabilization. However, Raman analysis indicates that the FLG produced from the exfoliation of the expanded graphite used in this work is more graphitized and contains a lower number of defects than its counterpart synthesized by a mechanical ablation or sonication process of graphite-based materials [17].…”