Chemical Moification of Graphene Oxide

Chemical moification of graphene oxide
Yoshiaki Matsuo Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji Hyogo, 671-2201, Japan ymatsuo@eng.u-hyogo.ac.jp Graphene oxide (also called graphite oxide or graphitic acid, abbreviated as GO) which was first synthesized in the 19th ascorbic acid is one of the covalent type of graphite embolism compounds. of late it has attracted much attention as a precursor of graphene, because it is slowly exfoliated into individual sheets in an aqueous solution. The structure of GO has not been fully solved yet, however, it possesses acidic hydroxyl, epoxy and carbonyl groups. Among these working(a) groups, the acidic hydroxyl groups be usually used for march on chemical modification of GO and various novel intercalation compounds of GO have been synthesized. When alkyl radical groups are attached to the layers of GO, the resulting materials are hydrophobic and are well exfoliated in organic solvents. In this paper, synthesis, properties and reactions of chemically modified GO are summarized. Preparation and properties of of hydrophobized GO The addition of the aqueous solution of cationic surfactants such as alkyltrimethylammonium ions to the GO dispersion readily provides the precipitation of surfactant-intercalated GO.



The orientation of alkyl groups between the layers of GO varies depending on the content of surfactant. As the add-on of the content it changes form monolayer, bilayer, interdigitated monlayer and paraffin type bilayer. An example of hexadecyltrimethylammonium ionintercalated GO is shown, ogether with the bilayer type orientation of alkyl chains between the layers of GO. GO layer N N N N N Alkylamines with long alkyl chain lengths are also intercalated into GO simply by mixing them mechanically in the movement of a small amount of hexane. Starting from N N N N N the alkylamine intercalated GO, silylated GO layer GO can be synthesized by the reaction GO with silylating reagents in organic solvents....If you want to get a full essay, sanctify it on our website: Orderessay



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