Controlled Synthesis of Novel Functionalized Graphene Derivatives and Hybrid Structures

新型功能化石墨烯衍生物和杂化结构的受控合成

• 批准号: 392444269
• 负责人: Professor Dr. Siegfried Eigler
• 金额: --
• 依托单位: Abteilung Organische Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/392444269?language=en
• 关键词: Controlled; Synthesis; Novel; Functionalized; Graphene

Carbon is unique and is the basis for life on earth. Many key-technologies, ranging from drug delivery to electronic applications, are based on carbon and make our modern civilization possible. Graphene has unique electronic properties and is outperforming conductive polymers by far. However, more important is the ability to functionalize the basal plane of graphene, an approach that allows introducing specific functions. We successfully introduced the controlled chemistry of oxo-functionalized graphene and this approach yields a high quality of graphene from flakes of water-soluble precursors. With this project, we want to advance the chemical methods for functionalization of graphene and aim on the synthesis of graphene derivatives with only one specific functional group to reduce the heterogeneity of this class of materials. This approach will lead to a deeper understanding of the properties. In particular, the C-C bond formation with oxo-functionalized graphene as precursor will give control over functionality and solubility of products for the first time and may be the basis to develop highly selective sensors in the future. Moreover mechanistic investigations for the formation of oxo-functionalized graphene will be conducted to identify the source of oxygen of its oxo-functionalities. That knowledge will be of utmost importance to either avoid or control the formation of lattice defects. We will synthesize functional charged pi-systems of different shape to study the interaction of the charged pi-systems with the surface of graphene and oxo-functionalized graphene, respectively. The evaluation of the photophysical and electronic properties will reveal how these systems can contribute to the development of selective sensors, solar cells or transparent and conductive coatings. The electrostatic and cation-pi interactions will be exploited to either stabilize graphene in solution or to tune the doping level of graphene. The evaluation of the molecular interaction with the surface of individual flakes of graphene and the change of electronic properties will be determined by Raman spectroscopy and in electronic devices. This approach allows quantifying the effect of doping. The gained knowledge will contribute to understand layered systems.Layered structures will be built by following self-assembly strategies. Layer-by-layer architectures of graphene derivatives and molecular layers will be prepared as novel graphite intercalation compounds with specific function for the first time. Stimuli, such as proton transfers will modulate the electronic properties of graphene inside the layered system. The changed electronic properties can subsequently related to pH values. These studies can lead to electronic pH sensors on the nm-scale. The basic investigations conducted in this project will advance the research field of organic electronics.

碳是独一无二的，是地球上生命的基础。许多关键技术，从药物输送到电子应用，都是基于碳的，使我们的现代文明成为可能。石墨烯具有独特的电子性质，其性能远远超过导电聚合物。然而，更重要的是使石墨烯的基面功能化的能力，这是一种允许引入特定功能的方法。我们成功地引入了氧化官能化石墨烯的受控化学，这种方法从片状的水溶性前驱体中获得了高质量的石墨烯。通过这个项目，我们想要推进石墨烯功能化的化学方法，并致力于合成只有一个特定官能团的石墨烯衍生物，以降低这类材料的异质性。这种方法将导致对属性的更深层次的理解。特别是，以氧代官能化石墨烯为前驱体的C-C键的形成将首次对产物的官能度和溶解性进行控制，并可能成为未来开发高选择性传感器的基础。此外，还将对氧官能化石墨烯的形成进行机理研究，以确定其氧官能团的氧源。这一知识对于避免或控制晶格缺陷的形成将是至关重要的。我们将合成不同形状的功能化带电体系，分别研究带电体系与石墨烯和氧化官能化石墨烯表面的相互作用。对光物理和电子性能的评估将揭示这些系统如何有助于开发选择性传感器、太阳能电池或透明和导电涂层。静电和阳离子-pi相互作用将被用来稳定溶液中的石墨烯或调节石墨烯的掺杂水平。对石墨烯单个薄片表面的分子相互作用和电子性质变化的评估将通过拉曼光谱和电子设备来确定。这种方法可以量化兴奋剂的影响。所获得的知识将有助于理解分层系统。分层结构将通过遵循自组装策略来构建。石墨烯衍生物和分子层的层层结构将首次被制备成具有特定功能的新型石墨层间化合物。质子转移等刺激将调制层状体系中石墨烯的电子性质。随后，改变的电子性质可能与pH值有关。这些研究可能导致纳米级的电子pH传感器。本项目所进行的基础研究将推动有机电子学研究领域的发展。