Fig. 2.

Major types of G-wires. a AFM images and b height profiles (under the black lines) of Type I and Type II G-wires showing periodic ridges (peaks) separated by 4.3 and 2.2 nm, respectively. The length scale (white bar) is 5 nm. c Histograms of peak-to-peak distances fitted with Gaussian indicate periodicity of 4.31 ± 0.34 and 2.17 ± 0.14 nm for Type I (100 molecules) and Type II (10 molecules) G-wires, respectively