Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 68: Nanostructures at Surfaces: 1D, 2D Structures and Networks
O 68.10: Poster
Wednesday, March 9, 2016, 18:15–20:30, Poster A
Growth competition between Sierpiński triangle fractals and two-dimensional molecular crystals of H3PH on noble metal surfaces — •Xue Zhang1 and Yongfeng Wang1,2 — 1Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing, China — 2Beida Information Research (BIR), Tianjin, China
Recent studies demonstrate that simple functional molecules, which usually form 2D crystal structures when adsorbed on solid substrates, are also able to self-assembly into ordered openwork fractal aggregates. To direct and control growth of such fractal supramolecules it is necessary to explore the conditions under which both fractal and crystalline patterns develop and coexists. In this contribution, we study the coexistence of Sierpińnski triangle (ST) fractals and 2D molecular crystals which were obtained by adsorption of H3PH molecules on Au(111) in high vacuum. Growth competition between the STs and 2D crystals was realized by tuning surface coverage as well as by changing the substrate and functional groups of the molecular building block. To better understand the mechanisms of the fractal structure formation our experimental studies were accompanied by theoretical calculations with Density Functional Theory and Monte Carlo methods. The obtained results demonstrate the possibility of steering the self-assembly to create surface-supported fractal and non-fractal structures made up of the same material.