Conductance histograms, derived from analysis of the conductive area (currents above 1 pA) of the contact current maps shown in Figure5c-j(bias voltage of 20 mV) and the contact current maps of the CNFs carbonized at 600 C, shown in FigureS3e- f(Supporting Information) (bias voltage of 100 mV to overcome detection limits). The conductance was calculated by dividing the contact current by the bias voltage. The averaged conductance is not significantly influenced by changing the applied bias voltage, as shown in FigureS6(Supporting Information). The histograms are plotted as average of two current maps for each sample and the histograms of individual CNFs are displayed in FigureS4.1-4.3(Supporting Information). The dashed lines represent the averaged conductance of each sample. Furthermore, the averaged conductances of each sample are correlated with the macroscopic conductivities determined by the four-point-method, displayed in (b). The microscopic data exhibit a strong correlation with the macroscopic data and both depend on the carbonization temperature. Please note the logarithmic scales and the different units for conductivity and conductance.
