Abstract
Two-dimensional (2D) materials, such as graphene and MoS2, have been attracting wide interest in surface enhancement Raman spectroscopy. This perspective gives an overview of recent developments in 2D materials’ application in surface-enhanced Raman spectroscopy. This review paper focuses on the applications of using bare 2D materials and metal/2D material hybrid substrate for Raman enhancement. The Raman enhancing mechanism of 2D materials will also be discussed. The progress covered herein shows great promise for widespread adoption of 2D materials in SERS application.
Highlights
Raman is a spectroscopy technique that can provide characteristic spectral information of analytes
For EM enhancement, molecules adsorbed at nanostructured metallic surface experience a large amplification of electromagnetic field due to local surface plasmon resonance leading to orders of magnitude increase in Raman yield and greatly enhanced Raman signal
Raman enhancement of two-dimensional materials is due to chemical mechanism [13, 23, 28, 29], which is different from electromagnetic enhancement mechanism of most metallic SERS substrates
Summary
Raman is a spectroscopy technique that can provide characteristic spectral information of analytes. Due to its capability of providing fingerprints of molecule vibration, Raman spectroscopy has a wide variety of applications in chemistry, biology, and medicine [1]. Surface-enhanced Raman spectroscopy (SERS) makes up this deficiency via plasmon resonance or chemical enhancement. It is capable of ultrasensitive detection (singlemolecule detection) and allows for label-free detection with high degree of specificity [2,3,4]. One is electromagnetic (EM) enhancement based on plasmon resonance, which account for majority of the signal enhancement for the metallic SERS substrates. For EM enhancement, molecules adsorbed at nanostructured metallic surface experience a large amplification of electromagnetic field due to local surface plasmon resonance leading to orders of magnitude increase in Raman yield and greatly enhanced Raman signal. This review will discuss the Raman enhancement mechanism of 2D materials and their applications in SERS
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