Multifunctional membranes of graphene oxide and titania nanocrystals: Electrical, mechanical, and electromechanical properties tuned via photocatalytic reduction

氧化石墨烯和二氧化钛纳米晶体的多功能膜：通过光催化还原调节电学、机械和机电性能

• 批准号: 395896547
• 负责人: Dr. Tobias Vossmeyer
• 金额: --
• 依托单位: Institut für Physikalische Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/395896547?language=en
• 关键词: Multifunctional; membranes; graphene; oxide; titania

In this project we study freestanding nanomembranes of partially reduced graphene oxide (rGO/GO) and TiO2-nanorods or -nanoplates. In these membranes the graphene component provides electrical conductivity. Further, (rGO/GO)-sheets are very strong but highly flexible materials, which conformally wrap around and agglutinate the TiO2-nanocrystals resulting in extremely robust nanocomposites. The TiO2-nanocrystals provide two important additional functions: First, they provide photocatalytic activity, which we utilize to adjust the degree of graphene oxide reduction and, thereby, to tune various physical and chemical properties of the membranes. Second, TiO2-nanocrystals are very stiff. Depending on their size, shape, and areal density they can form assemblies of imbricative or haystack-like morphology, which can strongly reinforce resulting nanomembranes. The main focus of this project is on the mechanical and responsive electromechanical properties of these nanomembranes, which are studied by AFM-bulge tests combined with in situ charge transport measurements. Further, the membranes are used for the fabrication of electrostatically driven actuators and resonators, and we explore how their properties are affected by various environmental parameters. This project generates comprehensive sets of data, which will enable a reliable evaluation of the potential of these material for applications as electromechanical sensors and actuators, e.g. as components in novel types of printable microelectromechanical systems (MEMS).

在这个项目中，我们研究了部分还原的氧化石墨烯(rGO/GO)和二氧化钛纳米棒或纳米板的独立纳米膜。在这些膜中，石墨烯成分提供导电性。此外，(rGO/GO)-薄片是非常坚固但高度灵活的材料，它以共形方式包裹并粘合纳米二氧化钛晶体，从而形成非常坚固的纳米复合材料。二氧化钛纳米晶提供了两个重要的附加功能：第一，它们提供了光催化活性，我们利用这一活性来调节氧化石墨烯的还原程度，从而调节膜的各种物理和化学性质。其次，二氧化钛纳米晶非常坚硬。根据它们的大小、形状和面密度，它们可以形成叠瓦状或干草状的聚集体，这可以强烈地增强生成的纳米膜。本项目的主要焦点是这些纳米膜的机械和响应机电性能，通过AFM-膨胀性测试和原位电荷传输测量来研究这些纳米膜。此外，我们还将该膜用于制作静电驱动的致动器和谐振器，并探索了各种环境参数对其性能的影响。该项目生成了一组全面的数据，这将使人们能够可靠地评估这些材料作为机电传感器和执行器的应用潜力，例如作为新型可打印微电子机械系统(MEMS)中的组件。