Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 68: Nanostructures at Surfaces: 1D, 2D Structures and Networks
O 68.3: Poster
Mittwoch, 9. März 2016, 18:15–20:30, Poster A
Sierpiński-triangle fractal crystals with the C3v point group — •Daoliang Song1 and Yongfeng Wang1,2 — 1Key Laboratory for the Physics and Chemistry of Nanodevices, Peking University, Beijing 100871, China — 2Beida Information Research (BIR), Tianjin 300457, China
Self-similar fractals exist widely in nature, from the well-known snowflakes to the complicate Saturn's rings and are not only fundamentally important in both science and engineering, but also interesting in esthetics. Metal-organic Sierpiński triangles are particularly attractive for applications in gas separation, catalysis and sensing. Such fractals are constructed in this study by using 120°V-shaped 4,4"-dicyano-1,1':3',1"-terphenyl molecules and Fe atoms on Au(111), and studied in detail by low-temperature scanning tunneling microscopy. Density functional theory calculations are employed to rationalize the invisible Fe atoms in STM images. Monte Carlo simulations are performed to understand the formation mechanism of the surface-supported fractal crystals.