Graphene Oxide (1)
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Graphene Oxide
No.167(October 2015)
Graphene oxide, Dispersion in Water (2)
Graphene oxide (GO, 1) has a structure of an oxidized graphene having hydroxy, carboxy and epoxy groups. Accordingly, GO can be dispersed in water and several polar solvents. A water dispersion of GO (2) is used as a lubricant to reduce friction on metal surfaces.1) Although graphene consists of only sp2 carbons, GO consists of some sp3 carbons and structural defects giving insulating properties. On the other hand, the reduction of GO provides a reduced graphene oxide (rGO) which is conductive. Therefore the rGO is expected to be an electrode material.
There are various synthetic methods of manufacturing GO, and the properties and applications depend on the degree of oxidation. A characteristic feature of our GO (1) is having a high degree of oxidation (50-55%). Highly oxidized GO supports a metal catalyst to drastically enhance its catalytic activity. Nishina et al. reported that GO-supported palladium prepared in situ catalyzes a cross-coupling reaction and hydrogenation even if there is very small amount of the catalyst.2,3) A silica-assisted rGO-Pt catalyst showed high catalytic activity and durability, compared with conventional catalysts.4) We can introduce several functional groups on GO because there are oxygen-based groups. These GO derivatives may be useful for luminescent materials and biosensors.5,6)
References
- 1)Tribological properties of monolayer graphene oxide sheets as water-based lubricant additives
- 2)Facile preparation of Pd nanoparticles supported on single-layer graphene oxide and application for the Suzuki–Miyaura cross-coupling reaction
- 3)Palladium on graphene: the in situ generation of a catalyst for the chemoselective reduction of α,β-unsaturated carbonyl compounds
- 4)Highly durable carbon-supported Pt catalysts prepared by hydrosilane-assisted nanoparticle deposition and surface functionalization
- 5)Protein recognition on a single graphene oxide surface fixed on a solid support
- 6)Eu(III)-coupled graphene oxide as a luminescent material
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