Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 51: Nanostructures at Surfaces: 1D and 2D Structures and Networks

O 51.1: Poster

Tuesday, March 21, 2017, 18:30–20:30, P1C

growth of covalently bonded Sierpiński triangles up to the second generation — gaochen gu, na li, and •yongfeng wang — key laboratory for the physics and chemistry of nanodevices, department of electronics, Peking University, Beijing, China.

Growth of covalently bonded Sierpiński triangles (CB-STs) on metal surfaces was investigated by scanning tunneling microscopy (STM). Three synthetic strategies (namely, dehydration condensation, cyclotrimerization coupling and Schiff-base reactions) were used to fabricate CB-STs. Second generation CB-STs were obtained at the solid-vacuum interface utilizing the Schiff-base reaction between 4,4"-dialdehyde-1,1':3',1"-terphenyl (TPDAL) and 1,3,5-tris(4-aminophenyl)benzene (TAPB) on Au(111). The CB-ST patterns persist at annealing temperatures as high as 500 K. Homotactic three-fold motifs, insufficient migration and irreversible covalent reaction are the main limitations for growing higher-generation STs. The present results provide new insights on the growth of STs on metal surfaces.