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. 2012 Mar 8;3:207–212. doi: 10.3762/bjnano.3.23

Figure 1.

Figure 1

(a) STM image of the PTCDA/Ag/Si(111) √3 × √3 surface. Scan area: 250 nm × 250 nm, tunneling voltage U = 0.9 V, tunneling current I = 70 pA. (b) Simultaneously recorded frequency shift at an oscillation amplitude of 2.8 Å. The Ag/Si(111) √3 × √3 surface gives rise to a larger frequency shift than the PTCDA islands.