Self-organisation and growth of organic molecules on oxide surfaces

funCOS 4旨在更深入地了解各种单晶氧化物衬底上的中等大小有机分子的膜生长和吸附动力学，金属单晶或纳米氧化物系统（主要是纳米颗粒）上的外延氧化膜。这包括各种相互作用的方面，特别是分子间相互作用和分子-基底相互作用的相互作用，其控制着有机薄膜的生长。利用探针，它提供的信息范围从原子到介观的长度尺度，从亚单层到多层制度的吸附的有机膜的结构特性可以访问。衍射技术（XRD，LEED，SAXS/SANS，GISAXS，XRR）提供的结构信息精度优于0.1埃，原位研究将提供薄膜形成动力学。表面敏感电子显微镜工具（PEEM，LEEM，XPEEM）将提供氧化物衬底和有机薄膜的真实空间信息。将遵循两种不同的制备路线，即，通过真空升华制备和通过湿化学路线的膜沉积。后者使用强的分子-基底相互作用来诱导在平面基底或纳米颗粒模板结构上形成自组装膜。因此，该项目将弥合特高压条件下制备的模型系统与溶剂中分子沉积之间的差距，从而提供制备高度有序分子系统而无需昂贵硬件的潜在途径。具体而言，我们将探讨吸附的dopamine膜的垂直和横向结构，吸附的分子的取向，分子-氧化物界面的结构特性，控制基板的修改和它们对有机膜的形成，膜生长模式，成核和平面氧化物基板上的长程相互作用和纳米颗粒氧化物的影响。现场调查将进一步允许深入了解成膜动力学。为了与其他funCOS组的最佳一致性，研究将集中在MgO，Co氧化物和TiO 2作为模型系统，包括表面改性基材和相应的纳米颗粒系统。

funCOS4 aims at a deeper understanding of film growth and adsorption kinetics of medium-sized organic molecules on various single-crystalline oxide substrates, epitaxial oxide films on metal single crystals or nanoscaled oxidic systems (mainly nanoparticles). This includes aspects of various interactions, in particular the interplay of intermolecular interactions and molecule-substrate interactions, which are governing the growth of ultrathin organic films. Utilizing probes, which offer information ranging from the atomic to the mesoscopic length scales, the structural properties of the adsorbed organic film from the submonolayer to the multilayer regime can be accessed. Diffraction techniques (XRD, LEED, SAXS/SANS, GISAXS, XRR) deliver structural information with accuracies better than 0.1 Angström and in-situ studies will offer access to film formation kinetics. Surface-sensitive electron microscopic tools (PEEM, LEEM, XPEEM) will offer real-space information for both, oxide substrates and organic thin films. Two different preparation routes will be followed, i.e., preparation by vacuum sublimation and film deposition by wet chemical routes. The latter uses strong molecule-substrate-interactions to induce the formation of SAMs on planar substrates or nanoparticulate template structures. Thus, the project will bridge the gap from model systems prepared under UHV conditions to molecular depositions from solvents, thus offering potential pathways to prepare highly ordered molecular systems without costly hardware. Specifically, we will explore the perpendicular and lateral structures of adsorbed ultrathin films, the orientation of adsorbed molecules, the structural properties of the molecule-oxide interface, controlled substrate modifications and their influence on organic film formation, film growth modes, nucleation and long-range interactions on planar oxidic substrates and for nanoparticulate oxides. In-situ investigations will furthermore allow the insight into film formation kinetics. For optimum coherence with the other funCOS groups, the studies will concentrate on MgO, Co oxides and TiO2 as model systems including surface-modified substrates and the respective nanoparticulate systems.