Extended Data Fig. 9: STM and AFM images of armchair-type GNR 8.
From: RETRACTED ARTICLE: Living annulative π-extension polymerization for graphene nanoribbon synthesis
a, STM image of armchair-type GNR 8 (M n = 2.4 × 104 Da, Đ = 1.32) deposited on HOPG (U = 1.0 V, I = 250 pA, T = 78 K). b, Dimeric assembly model of GNR 8. c, d, Cross-sectional height profile taken perpendicularly (i) and horizontally (ii) with respect to the wire shown in a. The observed substance had about 0.4 nm thickness and 3 nm width, and the repeating peripheral stripes had 0.4–0.5 nm intervals ((i) and (ii)). The existence of this substance was considered as the assembly of two molecules of 8, as depicted in b, and the observed periodicity of 0.4–0.5 nm corresponds to the longitudinal length between the alkyl side chains ((ii) in d). e, AFM phase image of self-assembling GNR 8 (M n = 2.4 × 104 Da, Đ = 1.32) on graphene cleaved on SiO2. f, Magnified AFM phase image of e. g, Cross-sectional height profile taken along the white line in f, perpendicularly to the observed stripe.
