Single sheet functionalized graphene by oxidation and thermal expansion of graphite

被引:3080
作者
McAllister, Michael J.
Li, Je-Luen
Adamson, Douglas H.
Schniepp, Hannes C.
Abdala, Ahmed A.
Liu, Jun
Herrera-Alonso, Margarita
Milius, David L.
Car, Roberto
Prud'homme, Robert K.
Aksay, Ilhan A. [1 ]
机构
[1] Princeton Univ, Dept Chem Engn, Princeton, NJ 08544 USA
[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
[3] Princeton Univ, Princeton Inst Sci & Technol Mat, Princeton, NJ 08544 USA
[4] Sandia Natl Labs, Albuquerque, NM 87185 USA
关键词
D O I
10.1021/cm0630800
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 degrees 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.
引用
收藏
页码:4396 / 4404
页数:9
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