类石墨烯二硫化钼及其在光电子器件上的应用

由单层或几层二硫化钼构成的类石墨烯二硫化钼(graphene-like MoS₂)是一种具有类似石墨烯结构和性能的新型二维(2D)层状化合物, 近年来以其独特的物理、化学性质而成为新兴的研究热点. 本文综述了近年来类石墨烯二硫化钼常见的几种制备方法, 包括以微机械力剥离、锂离子插层和液相超声法等为主的“自上而下”的剥离法, 以及以高温热分解、水热法等为主的“自下而上”的合成法; 介绍了其常用的结构表征方法, 包括原子力显微镜(AFM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和拉曼光谱等; 概述了类石墨烯二硫化钼的紫外-可见(UV-Vis)吸收、荧光发射等基本光物理性质及其相关机理; 总结了类石墨烯二硫化钼在二次电池、场效应晶体管、传感器、有机电致发光二极管和电存储等光电子器件领域的应用原理及其研究进展, 展望了这类新型二维层状化合物的研究前景.

Graphene-Like Molybdenum Disulfide and Its Application in Optoelectronic Devices

Graphene-like molybdenum disulfide (MoS₂), which is composed of a monolayer or few layers of MoS₂, is a new two-dimensional (2D) layered material that has attracted considerable attention recently because of its unique structure and optical and electronic properties. Here we first review the methods used to synthesize graphene-like MoS₂. “Top-down” methods include micromechanical exfoliation, lithium-based intercalation and liquid exfoliation, while the“bottom-up”approaches covered are thermal decomposition and hydrothermal synthesis. We then discuss several methods used to characterize the 2D layered structures of MoS₂, such as atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy. We describe the UV-Vis absorption and photoluminescent properties of graphene-like MoS₂ and their related mechanisms. Finally, we summarize the application of graphene-like MoS₂ in various optoelectronic devices such as secondary batteries, field-effect transistors, sensors, organic light-emitting diodes, and memory. The application principles and research progress are discussed, followed by a summary and outlook for the research of this emerging 2D layered nanomaterial.