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. 2024 Nov 5;15:9545. doi: 10.1038/s41467-024-53927-6

Fig. 2. Formation and structural characterization of planar oxa-nanographenes on Au(111) via room-temperature cyclodehydrogenation.

Fig. 2

a–c Large-scale and high-resolution STM images after depositing precursor 1 on Au(111) held at 300 K for 12 h and the corresponding statistical analysis of products. d, e Zoom-in STM, BR-STM, and nc-AFM images of two representative planar dimers formed by the removal of α-H and the corresponding chemical structures. f, g Zoom-in STM, BR-STM, and nc-AFM images of two representative planar monomers (f: cis-monomer; g: trans-monomer) and the corresponding chemical structures. The red arrows and yellow dotted circles indicate O atoms and methyl groups. Scale bars: a 20 nm. b 5 nm. d–g 0.5 nm. Scanning parameters: a U = 0.5 V, I = 10 pA. b U = 0.2 V, I = 50 pA. d,e U = 0.1 V, I = 100 pA. f U = 0.1 V, I = 10 pA. g U = 0.2 V, I = 8 pA. d-g BR-STM: CO tip, constant height, U = 10 mV.