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SERS Substrate: A Comprehensive Overview of Its Role, Structure, and Applications
Introduction
Surface-Enhanced Raman Scattering (SERS) substrate is a specialized material designed to significantly amplify Raman scattering signals of molecules placed on or near its surface. This enhancement enables highly sensitive detection of chemical and biological substances, even at extremely low concentrations. SERS substrates are widely used in analytical chemistry, biosensing, environmental monitoring, and forensic science due to their ability to provide precise molecular fingerprint information.
What is a SERS Substrate?
A SERS substrate is typically composed of nanostructured metallic surfaces, most commonly silver, gold, or copper. These nanostructures create localized electromagnetic fields when illuminated by a laser. The interaction between these fields and the target molecules dramatically increases the Raman signal intensity, sometimes by factors of up to 10⁶–10¹⁰ times compared to normal Raman spectroscopy.