[MOS] April 21, 2015, Xi Ling, Massachusetts Institute of Technology

[Zina M Queen]

Seminar on 

Modern Optics and Spectroscopy

 

Lighting up the Raman Signal of molecules in the vicinity of Graphene related materials

 

Xi Ling,

Massachusetts Institute of Technology 

Tuesday, April 21, 2015

12:00 – 1:00 p.m.

Surface enhanced Raman scattering (SERS) is a popular technique to detect the molecules with high selectivity and sensitivity. It has been developed for 40 years, and many review papers have been published to summarize the progress in SERS. Nevertheless, how to make the SERS signals repeatable and quantitative, and how to have deeper understanding on the chemical enhancement mechanism are still big challenges. Recently, graphene, as well as the other two dimensional (2D) materials, were developed to be used as a Raman enhancement substrate, which can light up the Raman signals of molecules, and these substrates were demonstrated to be a promising for micro/trace species detection. This effect was named as “graphene enhanced Raman scattering (GERS)”. GERS technique offers significant advantages for studying molecular vibrations due to the ultraflat and chemically inert 2D surfaces, which are newly available, especially in developing a quantitative and repeatable signal enhancement technique, complementary to SERS. Moreover, GERS is a chemical mechanism dominated effect, which offers a valuable model to study the details of the chemical mechanism. As a practical technique, the combination of GERS with a metal substrate incorporates the advantages from both the conventional SERS and GERS. The introduction of graphene to the Raman enhancement substrate extended SERS applications in a more controllable and quantitative way. In this talk, I will introduce this novel technique and our recent progress on GERS.
 

Grier Room, MIT Bldg. 34-401

Refreshments served after the lecture
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.mit.edu/pipermail/mos/attachments/20150416/b2e600cc/attachment.htm
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 1843 bytes
Desc: not available
Url : http://mailman.mit.edu/pipermail/mos/attachments/20150416/b2e600cc/attachment.bin