Fig. 4: The transition of carbon hybridization within 1D linear polymer and 2D COF fabricated by M2 and M3 on Ag(110) and Ag(111) surfaces, respectively.
From: Visualizing stepwise evolution of carbon hybridization from sp3 to sp2 and to sp
a Schematic representation showing the synthesis of 1D linear polymers 2B and 2C with the linkages L(C=C) and L(C≡C) after annealing M2 to 460 K and 520 K for 20 min on Ag(110), respectively. b, c High-resolution STM (200 mV, 120 pA) (b) and BR-STM (2 mV, Δz = 200 pm) (c) images showing the polymers 2B. d–f High-resolution STM (200 mV, 120 pA) (d), BR-STM (2 mV, Δz = 160 pm) (e), nc-AFM (2 mV, Δz = 190 pm) (f) images showing the polymers 2C obtained. g Schematic illustration showing the synthesis of 2D COF 3B and 3C with the linkages L(C=C) and L(C≡C) after annealing M3 to 460 K and 520 K for 20 min on Ag(111), respectively. h, i High-resolution STM (100 mV, 150 pA) (h) and BR-STM images (2 mV, Δz = 220 pm) (i) showing the COF 3B. j, k High-resolution STM (200 mV, 150 pA) (j) and BR-STM images (2 mV, Δz = 220 pm) (k) showing the COF 3C obtained via annealing to 520 K. Scale bars, 0.6 nm (b–f, h–k).
