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. 2019 Apr 16;141(18):7399–7406. doi: 10.1021/jacs.9b01267

Figure 5.

Figure 5

Synthesis of dibenzoperioctacene from TATP-tBu 5 on Au(111). (a, b) Chemical structures of TATP-tBu 5 and dibenzoperioctacene 6 (with tBu groups). (c) STM overview of the self-assembled TATP-tBu 5 molecules on Au(111); (d) STM overview taken after annealing the sample at 690 K for 30 min. (e) Zoomed-in STM image of an individual TATP-tBu 5 molecule that was marked with a red box in (c). (f) Zoomed-in STM image of a single dibenzoperioctacene 6 molecule that was marked with a red box in (d); (g) corresponding frequency shift AFM image. Imaging parameters: (c) −1.0 V, 10 pA; (d,f) 0.1 V, 10 pA; (e) −1.0 V, 100 pA; and (g) tip height Z = +170 pm, (Z = −20 pm for the region between the two red dashed lines in (g)), where the ± signs represent the increase/decrease of the tip–sample distance relative to the STM set point (0.1 V, 10 pA) on the adjacent Au(111) surfaces.