The synthesis of MOF nanosheets and the applications of MOFs-based resistance random access memory

Abstract

High-performance memory devices play an essential role in the innovation of modern electronics. Developing ultrafast memory devices has become imperative in response to large-scale data storage and ultra-fast data processing demands. Among these, resistive random-access memory (RRAM) has attracted much attention due to its fast read/write speeds, excellent scalability, and simple structure. RRAM devices employ metal/active layer/metal sandwich structures, where the active layer should convert between high-resistance (HRS) and low-resistance states (LRS) with an electric field. Common active layers include inorganic materials, conjugated polymers, organic small molecules, and organic/inorganic hybrid materials. Among them, Metal-organic frameworks (MOFs), one of the typical organic-inorganic hybrid materials, possess a porous structure and diverse topologies, making them promising candidates in gas adsorption and separation, catalysis, and sensing applications. There was relatively little research on MOFs in electronic devices, mainly due to MOF film's conductivity and thickness. Although the insulators could be used as active layers for memory devices, the thickness of the active MOF layer has a more significant impact on the performance of memory devices. Compared to MOF bulk crystals or MOF nanoparticles, MOF nanosheets have a unique two-dimensional morphology and nanoscale thickness, which retain the original properties of MOFs and are easy to form thin films. Recent research has been conducted on the synthesis and properties of MOF nanosheets, demonstrating superior performance over bulk MOFs or nanoparticles. This review first summarized the synthesis methods of MOF nanosheets, including top-down and bottom-up synthesis methods, then generalized the application of MOF materials in RRAM memory devices, and finally proposed the challenges and prospects of MOFs in developing RRAM memory devices.