ABSTRACT
Transmission electron microscopy provides a powerful tool for the characteri zation of the order and disorder in the fluorine-GICs. Of particular significance has been the lattice fringe image technique that have been reported for the fluorine-GICs [20]. In general, GICs show lattice image patterns indicative of long lengths of straight fringes originating from the well-order pristine material (see Fig. 8c). After intercalation by either donor or acceptor species, the basic structure of the graphite layer is preserved, even after the formation of the caxis superlattice. The lattice fringe images typically show large crystallite sizes both in the layer planes and normal to the layer planes. In the case of the fluorine-GICs, the basic graphene layer becomes wavy, forming ionic com pounds for low [F] concentrations, and even more wavy structures are observed as covalent bonds form with increasing [F] concentrations.
