Fig. 5
From: Supramolecular networks stabilise and functionalise black phosphorus
Exposure of the melamine cyanurate-terminated black phosphorus surface to atmosphere. a–c A sequence of tapping mode AFM scans of the same area showing partial oxidation on uncoated areas of the surface. Scans b, c and d were collected 4 h 35 m, 52 h and 35 days, respectively, after sample preparation. A high-resolution inset on image d was acquired 1 month after sample preparation with a Multi75Al-G probe using the third harmonic of 1205 kHz. The upper region of the inset shows the intact CA.M network whereas the lower part shows an area where the CA.M layer has been removed to expose the BP surface (as in Fig. 3a); the P rows are clearly visible confirming that no oxidation has occurred. Additional images showing this effect at different times, and over larger areas are included in Supplementary Information (Supplementary Figs. 1–3). e 1–3 show the same areas marked 1–3 on scans a–c. All large-scale AFM scans were acquired with Multi75Al-G cantilever using the fundamental resonance of 64.54 kHz
