Direct Extracellular Electron Transfer of the Geobacter sulfurreducens Pili Relevant to Interaromatic Distances

Figure 4

The charge mobilities and conductivities for different systems. Different colors are utilized to distinguish different systems. (a) The hole and electron charge mobility for each of the hopping system A, the hopping system B , the GS pili, and the robust pi-pi stacking system (perylene bisimide dyes) is 3.90 × 10⁻¹⁰ m²·v⁻¹·s⁻¹, 5.60 × 10⁻¹² m²·v⁻¹·s⁻¹, 2.19 × 10⁻⁵ m²·v⁻¹·s⁻¹, and 2.60 × 10° m²·v⁻¹·s⁻¹, and 4.70 × 10⁻¹⁰ m²·v⁻¹·s⁻¹, 3.30 × 10⁻¹³ m²·v⁻¹·s⁻¹, 1.09 × 10⁻⁴ m²·v⁻¹·s⁻¹, and 4.20 × 10³ m²·v⁻¹·s⁻¹, respectively. (b) The conductivity of the hopping system A the hopping system B and the GS pili is around 10⁻¹⁰ S·m⁻¹, 10⁻¹² S·m⁻¹, and 10³ S·m⁻¹, respectively. The conductivity (1.10 × 10⁴ S·m⁻¹) of the robust pi-pi stacking system (perylene bisimide dyes) belong to metallic-like materials.

(a)

(b)