Figure 2. Dimensionality-dependent charge transport properties of nanoparticle arrays with different number of monolayers at low temperature.

(a), Temperature-dependent conductance at low voltage bias in a semi-log scale. The logarithm of the zero-voltage conductance of all nanoparticle arrays is linearly proportional to the T^−1/2 at low temperature regardless of the layers of the nanoparticle arrays. (b), The coefficient β_D in ES-VRH model, which is supposed to depend on the system dimensionality D, as a function of the number of nanoparticle monolayers. Inset: Slopes of the ln(G)-T^−1/2 curves shown in (a) plotted as a function of number of nanoparticle monolayers.