Synthesis of Graphene Aerogel with High Electrical Conductivity

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• 作者：Marcus A. Worsley ; Peter J. Pauzauskie ; Tammy Y. Olson ; Juergen Biener ; Joe H. Satcher ; Jr. ; Theodore F. Baumann
• 刊名：Journal of the American Chemical Society
• 出版年：2010
• 出版时间：October 13, 2010
• 年：2010
• 卷：132
• 期：40
• 页码：14067-14069
• 全文大小：129K
• 年卷期：v.132,no.40(October 13, 2010)
• ISSN：1520-5126

文摘

We report the synthesis of ultra-low-density three-dimensional macroassemblies of graphene sheets that exhibit high electrical conductivities and large internal surface areas. These materials are prepared as monolithic solids from suspensions of single-layer graphene oxide in which organic sol−gel chemistry is used to cross-link the individual sheets. The resulting gels are supercritically dried and then thermally reduced to yield graphene aerogels with densities approaching 10 mg/cm³. In contrast to methods that utilize physical cross-links between GO, this approach provides covalent carbon bonding between the graphene sheets. These graphene aerogels exhibit an improvement in bulk electrical conductivity of more than 2 orders of magnitude (1 × 10² S/m) compared to graphene assemblies with physical cross-links alone (5 × 10⁻¹ S/m). The graphene aerogels also possess large surface areas (584 m²/g) and pore volumes (2.96 cm³/g), making these materials viable candidates for use in energy storage, catalysis, and sensing applications.