Real-space observation on standing configurations of phenylacetylene on Cu (111) by scanning probe microscopy

Qi Jing¹, Gao Yi-Xuan¹, Huang Li^{1, †}, Lin Xiao¹, Dong Jia-Jia², Du Shi-Xuan^{1, 3, ‡}, Gao Hong-Jun^{1, 3}

STM imaging of PA on Cu (111) substrate. (a) STM topography of PA molecules on Cu (111) substrate at LHe temperature. Dashed circles indicate typical PA monomer and dimer. Scale bar: 3 nm. (b) High-resolution STM image of PA monomer. Scale bar: 0.5 nm. (c) High-resolution STM image of PA dimer. Scale bar: 0.5 nm. (d) Line profile across monomer along blue arrow in panel 1(b) and the dimer along the red arrow in panel 1(c). STM scanning parameters: V_Sample = −100 mV and I = 50 pA.