title: Eco-friendly one-pot synthesis of highly dispersible functionalized graphene nanosheets with free amino groups.
abstract: An eco-friendly, facile and scalable hydrothermal approach, in which the reduction and functionalization of graphite oxide (GO) are completed in one pot, is proposed for the synthesis of monolayer 3-aminopropyltriethoxysilane (APTES)-functionalized graphenes (A-FGs). Atomic force microscopy, transmission electron microscopy and x-ray diffraction analyses indicate that the as-synthesized A-FGs consist of only one or a few layered graphenes, while x-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and thermogravimetric analysis reveal that APTES is bonded to graphene by the dehydration reaction between the Si-OH (produced by APTES hydration) and the -OH on the GO surface. As a result, free amino groups are left on the A-FGs. Moreover, A-FGs are highly dispersible in dimethylsulfoxide, APTES and ethylene glycol, and their solubilities are up to 0.89, 4.03 and 0.90 mg ml(-1), respectively.
authors.affiliation: State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China.
authors.forename: Zhiting
authors.initials: Z
authors.lastname: Liu
authors.forename: Xuezhi
authors.initials: X
authors.lastname: Duan
authors.forename: Gang
authors.initials: G
authors.lastname: Qian
authors.forename: Xinggui
authors.initials: X
authors.lastname: Zhou
authors.forename: Weikang
authors.initials: W
authors.lastname: Yuan
mesh_terms: D000588:Amines / Q000737:chemistry*; D003102:Colloids / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D000588:Amines; D003102:Colloids; D046911:Macromolecular Substances; D008567:Membranes, Artificial; D006108:Graphite