Graphene-Enhanced Raman Spectroscopy: Mechanisms, Optimization, and Applications

Raman spectroscopy has long been recognized as a powerful optical technique for materials analysis, garnering sustained scientific interest due to its ability to provide detailed vibrational fingerprints of molecular structures. Among the various Raman spectroscopy enhancement methods, Graphene-Enhanced Raman Spectroscopy (GERS) is an advanced variant of Raman spectroscopy that leverages the unique properties of graphene-based substrates to significantly amplify Raman signals. It has emerged as a pivotal technique for boosting the sensitivity of Raman spectroscopy, primarily through the exploitation of chemical enhancement pathways inherent to graphene. This article offers a thorough examination of the underlying mechanisms of GERS. It then presents various advanced graphene based substrates—including pristine graphene, graphene oxide (GO), nitrogen doped graphene, and other functionalized derivatives—engineered for superior Raman signal amplification. Finally, to highlight the importance of GERS and its potential in diverse and wide-ranging fields, this article comprehensively outlines the significant applications that GERS facilitates across various research disciplines and technological frontiers—from biomedical diagnostics and environmental monitoring to food safety and materials characterization—thereby establishing its importance as a powerful analytical tool.