Figure 2: In situ STM images of the PDPH monolayer on Au(111) in 0.05 M HClO4. The potentials of the sample and tip were 0.9 V and 0.35 V vs. RHE, respectively. The tunneling current was 1.5 nA. (A) Image area: 200 nm × 200 nm; (B) image area: 15 nm × 15 nm. The dashed black line shows the 2-Py molecule.