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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Single sheet functionalized graphene by oxidation and thermal expansion of graphite
Chemistry of Materials, Volume 19, No. 18, Year 2007
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Description
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. © 2007 American Chemical Society.
Authors & Co-Authors
McAllister, Michael J.
United States, Princeton
Princeton University
Li, Je Luen
United States, Princeton
Princeton University
Taiwan, Taipei
Academia Sinica, Institute of Atomic and Molecular Sciences
Adamson, Douglas H.
United States, Princeton
Princeton University
Schniepp, Hannes C.
United States, Princeton
Princeton University
Abdala, Ahmed A.
United States, Princeton
Princeton University
United Arab Emirates, Abu Dhabi
Khalifa University of Science and Technology
Liu, Jun
United States, Albuquerque
Sandia National Laboratories, new Mexico
United States, Richland
Pacific Northwest National Laboratory
Herrera-Alonso, Margarita
United States, Princeton
Princeton University
Milius, David L.
United States, Princeton
Princeton University
Car, Roberto
United States, Princeton
Princeton University
Prud'Homme, Robert K.
United States, Princeton
Princeton University
Aksay, Ilhan A.
United States, Princeton
Princeton University
Statistics
Citations: 3,251
Authors: 11
Affiliations: 5
Identifiers
Doi:
10.1021/cm0630800
ISSN:
08974756
Study Approach
Quantitative