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| - Exfoliated Graphene Separated by Platinum Nanoparticles
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| Abstract
| - Aggregation of isolated graphene sheets during drying graphene dispersions leads to a loss of its ultrahigh surface area advantage as a two-dimensional nanomaterial. We report a metal nanoparticle-graphene composite with a partially exfoliated graphene morphology derived from drying aqueous dispersions of platinum nanoparticles adhered to graphene. Platinum nanoparticles with diameters spanning several nanometers are adhered to graphene by a chemical route involving the reduction of metal precursors in a graphene dispersion. Face-to-face aggregation of graphene sheets is arrested by 3−4 nm fcc Pt crystallites on the graphene surfaces, and in the resulting jammed Pt−graphene composite, the Pt acts as spacers resulting in mechanically exfoliated, high-surface-area material of potential interest for supercapacitors and fuel cells.
- Reducing a platinum precursor in aqueous dispersions of isolated graphene sheets causes the nanoparticles to adhere to the graphene. In turn, when the dispersion is dried, the metal nanoparticles inhibit face-to-face aggregation of the graphene yielding a jammed metal−graphene composite with a high-surface-area morphology.
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| - Exfoliated Graphene Separated by Pt Nanoparticles
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