Статья

Single Sheet Functionalized Graphene by Oxidation and Thermal Expansion of Graphite

Michael McAllisterDepartment of Chemical Engineering, Department of Chemistry, and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Sandia National Laboratories, Albuquerque, New Mexico 87185Je-Luen LiDepartment of Chemical Engineering, Department of Chemistry, and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Sandia National Laboratories, Albuquerque, New Mexico 87185Douglas H. AdamsonSandia National LaboratoriesHannes C. SchnieppDepartment of Chemical Engineering, Department of Chemistry, and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Sandia National Laboratories, Albuquerque, New Mexico 87185Ahmed AbdalaDepartment of Chemical Engineering, Department of Chemistry, and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Sandia National Laboratories, Albuquerque, New Mexico 87185Jun LiuDepartment of Chemical Engineering, Department of Chemistry, and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Sandia National Laboratories, Albuquerque, New Mexico 87185Margarita Herrera‐AlonsoDepartment of Chemical Engineering, Department of Chemistry, and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Sandia National Laboratories, Albuquerque, New Mexico 87185David L. MiliusDepartment of Chemical Engineering, Department of Chemistry, and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Sandia National Laboratories, Albuquerque, New Mexico 87185Roberto CarDepartment of Chemical Engineering, Department of Chemistry, and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Sandia National Laboratories, Albuquerque, New Mexico 87185Robert K. Prud’hommeDepartment of Chemical Engineering, Department of Chemistry, and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Sandia National Laboratories, Albuquerque, New Mexico 87185İlhan A. AksayDepartment of Chemical Engineering, Department of Chemistry, and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Sandia National Laboratories, Albuquerque, New Mexico 87185

2007en

ABI

Аннотация

A detailed analysis of the thermal expansion mechanism of graphite oxide to produce functionalized graphene sheets is provided. Exfoliation takes place when the decomposition rate of the epoxy and hydroxyl sites of graphite oxide exceeds the diffusion rate of the evolved gases, thus yielding pressures that exceed the van der Waals forces holding the graphene sheets together. A comparison of the Arrhenius dependence of the reaction rate against the calculated diffusion coefficient based on Knudsen diffusion suggests a critical temperature of 550 °C which must be exceeded for exfoliation to occur. As a result of their wrinkled nature, the functionalized and defective graphene sheets do not collapse back to graphite oxide but are highly agglomerated. After dispersion by ultrasonication in appropriate solvents, statistical analysis by atomic force microscopy shows that 80% of the observed flakes are single sheets.

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Идентификаторы

DOI: 10.1021/cm0630800

Цитирования и источники

Цитирований: 5Использованных источников: 0

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