Grapheme sheets

FIGU RE 9.4 Schematic diagram of a hexagonal grapheme sheet. 

Wei WD, Li F, Shuai WZ, Ren W, Ming CH (2009) Electrochanical interfacial capacitance in multilayer grapheme sheets dependence on nimiber of stacking layers. Electrochem Commun 11 1729-1732... 

Carbon nanotubes are classified as single-walled nanotubes (SWNTs) and multiwalled nanotubes (MWNTs). A SWNT can be visualized as a grapheme sheet that has been rolled into a hollow cylinder with ends caps. So the atomic structure of SWNT can be described by the chiral vector and the chiral angle 6 (see Fig. 23.5) given by Refs. [70-77] ... 

In addition to interfacial interactions between the CNT and the polymer matrix, the dispersion of CNTs in the polymer has signifieant influence on the performance of a CNT-polymer nanocomposite. Many different approaches have been used by researchers in an attempt to disperse CNT in polymer matrix such as physical sonication and chemical modification of CNT surface [124-126]. Functionalization of CNT surface can lead to the construction of chemical bonds between the nanotube and polymer matrix and offers the most efficient solution for the formation of strong interface. A strong interface between the coupled CNT-polymer creates an efficient stress transfer [31]. It should be noted that covalent functionalization of CNT may disrupt the grapheme sheet bonding, and thereby reduce the mechanical properties of the final product. However, noncovalent treatment of CNT can improve the CNT-polymer (Fig. 23.10) composite properties through various specific interactions [127]. 

Lomeda JR, Doyle CD, Kosynkin DV, Hwang WE, Tour JM (2008) Diazonium functionalization of surfactant-wrapped chemically converted grapheme sheets. J Am Chem Soc 130 16021-16030... 

Fig. 5.2 The structure of single-walled (SWCNT) formed by wrapping a single sheet of grapheme (multi-waUed (MWCNT) are obtained from two or more sheets of grapheme [33]...

Kishore, D., Taiat, M., Srivastava 0. N., and Kayastha A. M. [2012]. Immobiiization of / -gaiactosidase onto functionaiized grapheme nano-sheets using response surface methodoiogy and its anaiyticai appiications. PLoS ONE, 7. 

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