Surface-Based Self-Assembly of 3-D Spintronic Coordination Nano-Architectures

3-D 自旋电子配位纳米结构的表面自组装

• 批准号: 316890188
• 负责人: Professor Dr. Johannes V. Barth
• 金额: --
• 依托单位: Arbeitsgruppe Oberflächen- und Grenzflächenphysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/316890188?language=en
• 关键词: Surface; Based; Self; Assembly; Spintronic

Within the frame of COORNETs we aim at the construction of robust 3-D spintronic coordination networks at well-defined interfaces under ultra-high vacuum conditions using sublimation and/or electrospray ionization (ESI) deposition of building blocks. The 3-D self-assembly process exploits metal-ligand interactions between custom-designed molecular linkers and magnetically active metal centers to afford functional nano-architectures. We notably plan to engineer templated coordination networks providing different magnetic features, incorporating (i) Fe(II) based spin-crossover (SCO) or (ii) tetrapyrrole molecules functionalized with magnetic transition metals or lanthanides. Moreover, enhancement of electric conductivity will be explored by (i) inclusion of photopolymerizable moieties in the MOF building block or (ii) engineering of the coordination node. The physicochemical properties and functional behaviour of the obtained surface-based 3-D networks will be studied by molecular-level scanning tunneling microscopy/spectroscopy observations (STM/STS), complemented by high-resolution X-ray spectroscopies, X-ray magnetic circular dichroism (XMCD), and a set of complementary sophisticated methods. Input: Our collaboration relies on a longstanding expertise in the self-assembly and the characterization of molecule-based coordination and covalent networks or nanostructures on surfaces (with more than 35 joint publications during the last years). In particular, we are herein interested in spintronic materials and devices, including their structural, electronic, magnetic or mechanical properties. The relevant proficiency relies on the conception of carefully tailored and de-novo synthesized molecular bricks, as well on the development of assembly protocols to steer processes and spatial organization under near-surface conditions. The structural, electrical and magnetic characterization of the obtained surface-based networks and nano-architectures is achieved mainly by a combination of STM/STS and X-ray spectroscopy techniques. Output offered: We plan to obtain new classes of spintronic coordination networks with unique functional properties, in particular (i) switchable magnetic properties based on spin crossover compounds and porphyrins/phthalocyanines combined with (ii) spintronic conductivity through engineering of either the coordination node or the functionalizing of linker species for post-synthetic photopolymerization.

在 COORNET 的框架内，我们的目标是在超高真空条件下使用升华和/或电喷雾电离 (ESI) 沉积构建块，在明确的界面上构建强大的 3D 自旋电子配位网络。 3D 自组装过程利用定制设计的分子连接体和磁性活性金属中心之间的金属-配体相互作用来提供功能性纳米结构。我们特别计划设计提供不同磁性特征的模板化配位网络，结合（i）基于Fe（II）的自旋交叉（SCO）或（ii）用磁性过渡金属或镧系元素功能化的四吡咯分子。此外，将通过（i）在 MOF 构件中包含光聚合部分或（ii）配位节点的工程来探索电导率的增强。所获得的基于表面的3D网络的物理化学性质和功能行为将通过分子级扫描隧道显微镜/光谱观察（STM/STS）进行研究，并辅以高分辨率X射线光谱、X射线磁圆二色性（XMCD）和一套互补的复杂方法。输入：我们的合作依赖于自组装以及基于分子的配位和共价网络或表面纳米结构表征方面的长期专业知识（过去几年共发表了超过 35 篇联合出版物）。我们特别对自旋电子材料和器件感兴趣，包括它们的结构、电子、磁性或机械特性。相关的熟练程度依赖于精心定制和从头合成的分子砖的概念，以及组装协议的开发，以在近地表条件下引导过程和空间组织。所获得的基于表面的网络和纳米结构的结构、电学和磁学表征主要是通过STM/STS和X射线光谱技术的结合来实现的。提供的输出：我们计划获得具有独特功能特性的新型自旋电子配位网络，特别是（i）基于自旋交叉化合物和卟啉/酞菁的可切换磁性，以及（ii）通过设计配位节点或用于合成后光聚合的连接物质的功能化来实现自旋电子传导性。