Extended Data Fig. 3: On-surface synthesis of the 5-ZGNR and JGNRs.
From: Janus graphene nanoribbons with localized states on a single zigzag edge
a, e, f. STM topographic image of molecular precursor 1, 2, and 3 as deposited on Au(111), respectively. b, f, j. The STM topographic images of polymer chains obtained by annealing the sample of a, e, f up to 473, 473, and 423 K, respectively. c, g, k. STM topographic images of fully cyclized (5,2)-JGNR, (4,2)-JGNR and 5-ZGNR through a subsequent annealing at 623, 623, and 573 K (Vs = 1 V, It = 100 pA), respectively. d, h, l. Constant current zoom-in STM images of an individual (5,2)-JGNR, (4,2)-JGNR and 5-ZGNR, respectively (Vs = −800 mV, It = 200 pA, CO-functionalized tip).
