Fig. 2
From: Supramolecular networks stabilise and functionalise black phosphorus
Assembly of trimesic acid on black phosphorus. a Structures of trimesic acid (TMA) and the honeycomb structural motif. b AFM scan of two islands of TMA acquired in tapping mode using the fundamental resonance of 59.97 kHz; the sample was prepared by immersion of BP for 180 s in a 190 μM solution of TMA in EtOH. c High-resolution AFM scan showing honeycomb arrangement of TMA within the island on scan b. The scan was acquired in tapping using the second harmonic with resonant frequency of 390.8 kHz. d A large area AFM image taken 4 h after the sample was prepared by immersion for 60 s of BP in a 190 μM solution of TMA in EtOH. The arrows show the location of TMA islands; these appear as depressions since the surrounding BP has been partially oxidised. The scan was acquired in tapping mode using the fundamental resonance with resonant frequency of 61.63 kHz. e A cross-section showing the height of the island on scan b (~0.4 nm) and the TMA periodic structure on scan c
