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. 2015 Aug 25;6:8098. doi: 10.1038/ncomms9098

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(a) STM overview of fused B-GNR. Scale bar, 10 nm. (b) Frequency shift Δf map of N=7 B-GNR and (c) the corresponding Laplace filtered image for a better view of bonds. (d) and the simulated AFM image. (e,f) Δf maps of fused N=14 B-GNR with different structures. (g) Δf map of fused N=21 B-GNR. Measurement parameters: A=38 pm and V=0 V.