Figure 3
STM images showing OM chains obtained after 30 min annealing of DBBA/Ag(111) at 120 °C (a); and OM chains which are formed by DBBA on Cu(111) at RT (b). The insets show zoomed-in areas with three OM chains. The “armchair” and “zigzag” chain patterns are highlighted by the white line. The semi-transparent green rectangles highlight sample areas with structural defects in the OM chains. (c) and (d) are the line profiles taken along the lines of the corresponding color in the insets for OM chain on Ag(111) and Cu(111), accordingly. DFT-optimized models for OM chain on Ag(111) (e) and Cu(111) (f) are shown, where characteristic distances are marked for comparison with the experimental line profiles. ABBA and ABAB stand for the periodicity characteristic for the “armchair” and “zigzag” OM chains. In the models, the light-grey colored atoms are the substrate atoms, blue colored atoms are the metal adatoms involved in the formation of the OM chain, dark-grey colored atoms are carbon atoms, and light-pink colored atoms are hydrogen atoms. All distances are shown in nm. Tunneling parameters (VS/IT): (a) -1.3 V/300 pA; (b) -1.5 V/150 pA.
