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1428 Graphene – Synthesis, Characterization, Properties anWdill-bAe-psept-lbiyc-IaN-tTiEoCnHs Fig. 8. Mobility vs. carrier density obtained for samples A and B (after Dusari, Barzola-Quiquia, Esquinazi & García (2011)) and for HOPG (dashed line, after García et al. (2008)). Note that the data points are not obtained at a constant temperature but the temperature is changed to get a change in the carrier density and mobility. The points are obtained between 300 K and 10 K for sample B and 300 K and 60 K for sample A. For the HOPG sample (dashed line) the data run from 5 K at the largest mobility values to 300 K. The straight line corresponds to the data of a suspended graphene sample at 20 K from Du et al. (2008). 4. The influence of interfaces inside bulk graphite samples: Hints for the existence of high-temperature superconductivity 4.1 General remarks Ideal graphite is a layered material where each of the layers (graphene) consists on a honeycomb lattice of carbon atoms. Graphene layers are stacked together with Van der Waals forces much smaller than the covalent ones between the carbon atoms within a single layer. This weak coupling between graphene layers within the graphite structure can be "translated" in a huge anisotropy in the resistivity ρc/ρa 106 at low temperatures. In high quality samples this leads to a quasi-two dimensionality of the transport because most of it occurs within the graphene layers inside the graphite structure (Kopelevich & Esquinazi, 2007). However, real graphite cannot be considered as an ideal uniform stack of ideal graphene layers, as we discussed in Section 2. The role of defects (Arndt et al., 2009; Barzola-Quiquia & Esquinazi, 2010; Barzola-Quiquia et al., 2007) as well as internal interfaces (Barzola-Quiquia et al., 2008) have a crucial effect in the electrical properties. Clear evidence on the non uniformity of real graphite structures is given by several microscopy techniques,PDF Image | GRAPHENE SYNTHESIS CHARACTERIZATION PROPERTIES
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