INSTM and Chemistry for Technologies Laboratory, University of Brescia , Brescia 25123, Italy.
Department of Chemistry, The City College of New York , New York 10031, United States.
Chem Rev. 2016 Dec 28;116(24):14921-14981. doi: 10.1021/acs.chemrev.6b00365. Epub 2016 Oct 14.
Dielectrics represent a new frontier for surface-enhanced Raman scattering. They can serve as either a complement or an alternative to conventional, metal-based SERS, offering key advantages in terms of low invasiveness, reproducibility, versatility, and recyclability. In comparison to metals, dielectric systems and, in particular, semiconductors are characterized by a much greater variety of parameters and properties that can be tailored to achieve enhanced Raman scattering or related effects. Light-trapping and subwavelength-focusing capabilities, morphology-dependent resonances, control of band gap and stoichiometry, size-dependent plasmons and excitons, and charge transfer from semiconductors to molecules and vice versa are a few examples of the manifold opportunities associated with the use of semiconductors as SERS-active materials. This review provides a broad analysis of SERS with dielectrics, encompassing different optical phenomena at the basis of the Raman scattering enhancement and introducing future challenges for light harvesting, vibrational spectroscopy, imaging, and sensing.
电介质代表了表面增强拉曼散射的一个新前沿。它们可以作为传统金属基 SERS 的补充或替代物，在低侵入性、重现性、多功能性和可回收性方面具有关键优势。与金属相比，介电系统，特别是半导体，具有更多的参数和特性，可以对其进行调整以实现增强的拉曼散射或相关效应。光捕获和亚波长聚焦能力、形态相关共振、能带隙和化学计量控制、尺寸相关等离子体和激子以及半导体到分子的电荷转移，这些都是使用半导体作为 SERS 活性材料的多种机会的几个例子。本综述广泛分析了介电体的 SERS，包括拉曼散射增强的基础上的不同光学现象，并为光收集、振动光谱学、成像和传感提出了未来的挑战。
