文档介绍：Graphene Oxide Dispersions anic Solvents J. I. Paredes,* S. Villar-Rodil, A. Mart? ′nez-Alonso, and J. M. D. Tasco ′n Instituto Nacional del Carbo ′n, CSIC, Apartado 73, 33080 O Viedo, Spain Recei Ved June 5, 2008. Re Vised Manuscript Recei Ved August 5, 2008 The dispersion behavior of graphene oxide in anic solvents has been investigated. As-prepared graphite oxide could be dispersed in N , N -dimethylformamide, N-methyl-2-pyrrolidone, tetrahydrofuran, and ethylene glycol. In all of these solvents, full exfoliation of the graphite oxide material into individual, single-layer graphene oxide sheets was achieved by sonication. The graphene oxide dispersions exhibited long-term stability and were made of sheets between a few hundred nanometers and a few micrometers large, similar to the case of graphene oxide dispersions in water. These results should facilitate the manipulation and processing of graphene-based materials for different applications. 1. Introduction Graphene, the 2D lattice of sp 2-bonded carbon atoms from which graphite, carbon nanotubes, and fullerenes are derived, has emerged in recent years as a novel and important class of materials on its own merit. This is due not only to the plethora of new fundamental science that it has displayed 1but also to the prospect of a variety of applications that span graphene-based nanoelectronic devices, 2,posite materials, 4,5 and gas sen- sors. 6 As with any new material that is intended for large-scale applications, the development of methods that allow the mass production and processing of graphene sheets has e a top priority. In this regard, although the originally reported approach to the preparation of graphene (., micromechanical cleavage of bulk graphite) leads to high-quality 2Dcrystals and is suitable for fundamental studies, it suffers fromextremely lowproductivity and is therefore inadequate for large-scale use. 1,2At present, the only route that affords graphene-based sheets in considerable quantitie