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. 2019 Feb 6;13(2):1385–1393. doi: 10.1021/acsnano.8b06885

Figure 5.

Figure 5

STM topographic and nc-AFM frequency shift image of the coupling product on Cu(111) after annealing to 400 K. (a) Constant-current STM image of the coupled network and codeposited CO molecules. (b) Nc-AFM frequency shift image of the area marked by dashed square in panel a. (c) Constant-current overview image with the corresponding (d) nc-AFM image and (e) Laplace filtered nc-AFM image revealing the different bonding schemes in detail: covalent C–C bond (white arrow), three-fold Cu coordination (green arrow), and two-fold Cu coordination (yellow arrow). All STM images are measured with a CO-functionalized tip. Scanning parameters: (a, c) Vb = 30 mV, It = 14 pA; (b, d) The tip is 10 pm retracted relative to a STM set point of 30 mV and 14 pA on the bare Cu.