title: Monodisperse chemically modified graphene obtained by density gradient ultracentrifugal rate separation.
abstract: A simple density gradient ultracentrifuge separation method has been developed for sorting chemically modified graphene (CMG) by sheet size and surface chemistry in just a few minutes. By optimizing the parameters, including the density gradient and centrifugation time, CMG sheets with specific size ranges and optical properties can be targeted selectively. UV-vis absorbance and photoluminescence spectra revealed the properties of separated CMG samples are highly dependent on their sheet size and degree of oxidation. A possible mechanism for the separation is discussed.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, P.O. Box 98, Beijing 100029, China. sunxm@mail.buct.edu.cn
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Sun
authors.forename: Dachao
authors.initials: D
authors.lastname: Luo
authors.forename: Junfeng
authors.initials: J
authors.lastname: Liu
authors.forename: David G
authors.initials: DG
authors.lastname: Evans
mesh_terms: D002499:Centrifugation, Density Gradient / Q000379:methods*; D003102:Colloids / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D003102:Colloids; D046911:Macromolecular Substances; D006108:Graphite