新型金属有机框架(MOFs)材料及其在忆阻器应用方面的研究

Memristors have attracted a great deal of interest because of their potential applications in the information storage, logical operation and synapse, etc. However, compared with the traditional memory materials, the research of metal-organic-frameworks (MOFs) materials combined with the advantages of excellent storage properties of inorganic materials and bendability of organic materials is still in the early stage on the performance and mechanism of the flexible memristors. This project is aimed to combine the triangular organic ligands with abundant pi-conjugated electrons, which helps electron transport, with the transition metal ions (Cu2+, Ag+, or Fe3+) to synthesize novel MOFs single crystals by molecular designed strategies. The intrinsic properties of these MOFs single crystals are investigated in detail. High quality MOFs single-crystalline thin films were grown on the flexible substrates by liquid phase epitaxy and so on. The fabrications and performance of flexible memristors were also systematically studied. The basic requirements and rules of MOFs materials suitable for flexible memristors were summarized, and the performance mechanisms of the memristors were also studied. The purpose of this project is not only to give a new understanding of the basic conditions for building MOFs for memristors, but also to provide the important guidance for extending the new MOFs into the intelligent synapses and flexible wearable device applications.

忆阻器在信息存储、逻辑运算和神经突触等领域具有重要的应用前景，引起国内外研究者的关注。然而，与传统记忆材料相比，兼顾无机材料的优异存储特性和有机材料的可弯曲特性的金属有机框架(MOFs)材料在柔性忆阻器性能和机理研究尚处于起步阶段。本项目拟通过分子设计策略以有利于电子传输的、含丰富π共轭电子的三角形有机化合物为配体，桥联过渡金属离子(Cu2+、Ag+或Fe3+)，合成新型金属有机框架单晶材料，研究其本征物理性能及稳定性。在柔性基底上通过液相外延等方法制备高质量MOFs单晶薄膜，进行柔性忆阻器的制备与性能测试，总结满足柔性忆阻器制备规格的MOFs材料的基本要求和规律，开展其忆阻器方面的机理研究。本项目的开展不仅对理解构筑忆阻器的MOFs材料所满足的基本条件提供新的认识，而且对拓展新型MOFs材料在智能神经突触和柔性可穿戴设备领域的应用具有重要意义。

本项目以金属有机框架材料为中心，从单晶材料的合成、薄膜的制备和性能探索等方面开展研究。首先，系统探索多孔金属有机框架材料的合成条件，得到十几例结构新颖的金属有机框架材料，并通过X-射线单晶衍射、热重分析、红外光谱等测试手段对其晶体结构、孔道大小和稳定性等基本性能进行表征。其次，深入研究金属有机框架材料在光学器件、仿生催化、忆阻等方面的性能，探讨其结构与性能之间的关系，为多功能金属有机框架材料的合成提供重要的参考依据。此外，研究了金属有机框架薄膜的制备方法，发展基于金属有机框架器件的加工策略，探究其相应的忆阻性能，拓展了在信息存储方面的应用潜能。上述部分研究成果以第一作者或通讯作者身份发表在ACS Central Science , ACS Applied Materials & Interfaces，Chemistry of Materials 等国际期刊上，相关研究工作得到国内外同行专家的积极评价和认可。