二维层状材料的表面增强拉曼散射效应及高效分子探测性能

Two-dimensional layer materials for highly efficient molecular sensing based on surface-enhanced Raman scattering

表面增强拉曼散射(SERS)因其无损检测、快速响应和高灵敏度等优点,已经发展成为一种高效的分子探测技术。但目前大多数关于SERS的研究仍然基于贵金属材料(如Au、Ag等),成本高、表面均匀性较低、生物相容性差等不足限制了其广泛应用。石墨烯具有原料来源丰富、二维原子级平面、大比表面积、高稳定性和独特的电学和光学性能等优势,研究表明其可作为一种有效的SERS基底材料,为相关研究开拓了新思路。近年来,过渡金属硫族化合物(TMDCs)、六方氮化硼、黑磷、二维碳氮化物等二维无机层状材料也开始受到研究者关注。本文综述了石墨烯、TMDCs等二维层状材料作为SERS基底的最新研究进展并阐述了SERS增强机理。在此基础上,提出了二维层状材料用于高性能SERS基底材料研究面临的一些挑战,并对该领域发展前景进行了展望。

Surface-enhanced Raman scattering(SERS)has been regarded as an attractive technique for efficient molecular sensing because of its nondestructive detection,fast response and high sensitivity.However,the majority of studies on SERS are still based on noble metals(e.g.Au,Ag),which suffer from the drawbacks of high-cost,low uniformity and poor stability,thus limiting their widespread use.Graphene shows an efficient SERS performance because of its two-dimensional(2D)atomically flat surface,large specific surface area,high stability and unique electronic/optical properties,which open up new avenues for SERS research.In recent years,other 2D inorganic layer materials,such as transition metal dichalcogenides(TMDCs),hexagonal boron nitride(h-BN),black phosphorus(BP),and MXenes,have also attracted increasing research attention.We summarize the SERS mechanisms and state-of-the-art progress on substrates based on 2D materials,including graphene and other 2D inorganic layer materials.The challenges and prospects for future research on high-performance SERS substrates are considered.