Tailoring molecular island shapes:influence of microscopic interaction on mesostructure  

作　　者：Simon Aeschlimann Lu Lyu Benjamin Stadtmuller Martin Aeschlimann Angelika Kuhnle 

机构地区：[1]Institute of Physical Chemistry,Johannes Gutenberg University Mainz,Duesbergweg 10-14,Mainz,55099,Germany [2]Graduate School Materials Science in Mainz,Staudingerweg 9,Mainz,55128,Germany [3]Department of Physics and Research Center OPTIMAS,University of Kaiserslautern,Erwin-Schrödinger-Straße 46,Kaiserslautern,67663,Germany [4]Graduate School Materials Science in Mainz,Erwin-Schrodinger-Straße 46,Kaiserslautern,67663,Germany [5]Physical Chemistry I,Faculty of Chemistry,Bielefeld University,Universitätsstraße 25,Bielefeld,33615,Germany

出　　处：《Nano Research》2020年第3期843-852,共10页纳米研究（英文版）

摘　　要：Controlling the structure formation of molecules on surfaces is fundamental for creating molecular nanostructures with tailored properties and functionalities and relies on tuning the subtle balance between intermolecular and molecule-surface interactions.So far,however,reliable rules of design are largely lacking,preventing the controlled fabrication of self-assembled functional structures on surfaces.In addition,while so far many studies focused on varying the molecular building blocks,the impact of systematically adjusting the underlying substrate has been less frequently addressed.Here,we elucidate the potential of tailoring the mesoscopic island shape by tuning the interactions at the molecular level.As a model system,we have selected the molecule dimolybdenum tetraacetate on three prototypical surfaces,Cu(111),Au(111)and CaF2(111).While providing the same hexagonal geometry,compared to Cu(111),the lattice constants of Au(111)and CaF2(111)differ by a factor of 1.1 and 1.5,respectively.Our high-resolution scanning probe microscopy images reveal molecular-level information on the resulting islands and elucidate the molecular-level design principles for the observed mesoscopic island shapes.Our study demonstrates the capability to tailor the mesoscopic island shape by exclusively tuning the substrate lattice constant,in spite of the very different electronic structure of the substrates involved.This work provides insights for developing general design strategies for controlling molecular mesostructures on surfaces.

关 键 词：scanning tunneling microscopy(STM) self-assembly island shape mesostmcture scanning probe microscopy(SPM) twodimensionBl structures 

分 类 号：O62[理学—有机化学]