Enhancing Raman Scattering with Surface-Enhanced Raman Scattering (SERS)
Surface-Enhanced Raman Scattering (SERS) offers a significant improvement in sensitivity over normal Raman scattering, with enhancements of up to 10^6. The theory behind SERS involves roughness, periodic structures, resonance frequencies, and the enhancement of incident light through electromagnetic fields. The electric field in between particles plays a crucial role in SERS. Explore the discoveries and advancements in SERS, providing a deeper understanding of this powerful analytical technique.
Uploaded on | 1 Views
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
Surface-Enhanced Raman Scattering (SERS) Christopher Winta
1 Introduction SERS offers an improvement over normal Raman scattering in terms of sensitivity gives Raman enhancements of up to 106
1 Introduction 1974: initially observed by M. Fleischmann et al. [1] 1977: Jeanmaire and Van Duyne: Enhancement can t be solely due to increased surface area 1978: M. Moskovits proposes electromagnetic theory
2 Theory Roughness, periodic structure resonance frequency Model roughness features with a sphere
2 Theory ?3 ?3 ?0 cos? ??= ?0 cos? + ? ?1?? ?0 ?1??+2?0 with ? = [2] Metal particle is surrounded by electric field with maximum at ?1= 2 for ?0 1. Enhancement of incident light ????????= ? ?0
2 Theory Raman scattered light: ?? ?? ???????? ?? ? ?0 gets enhanced by the surface plasmon: ????? ?? ? ? ?0 Measurement of intensity ? ?2: ????? ?? 2?4 ?0 for ? ? 4 8 105 ??? 30 ???
3 SERS in between particles Electric field in between particles increases as the distance ? decreases. [2]
References 1. M. Fleischmann, P.J. Hendra, A.J. McQuillan, Raman spectra of pyridine adsorbed at a silver electrode, 1974 2. Katrin Kneipp, Martin Moskovits, Harald Kneipp: Surface-Enhanced Raman Scattering: a Brief Perspective, Springer, 2006 3. Hongxing Xu, Mikael K ll, Polarization-Dependent Surface-Enhanced Raman Spectroscopy of Isolated Silver Nanoaggregates, 2003
