Surface enhanced Raman scattering (SERS)

Raman spectroscopy is one of the powerful techniques to identity molecules. However, it is not a very sensitive technique because of weak Raman scattering effect. Thus, this technique was useless for low concentration detection until Surface enhanced Raman scattering (SERS) was discovered. The Raman scattering cross section can be enhanced by metal nanostructures. There are two primary—electromagnetic and chemical—theories to explain the mechanism of the enhancement. Several researchers have reported using different types, shape, and size of nanostructures for SERS. Even single molecule detections were demonstrated. However, how to achieve a robust, simple, reliable, highly-sensitive, and cost-effective SERS platform remains unanswered. I have been exploring SERS actives platforms—planar substrate, photonic crystal fiber (PCF), and capillary for ultra-sensitive vapor and liquid detections.