|Description||2018 Spring Physics Colloquium Series|
Dmitry Kurouski, Ph.D.
Department of Biochemistry and Biophysics
Texas A&M University
Raman Spectroscopy from Principles
to Practical Applications
Raman spectroscopy (RS) is a label-free, non-invasive, non-destructive analytic technique that provides information about the chemical structure of analysed specimens. Raman scattering can be enhanced up to 108 by gold or silver nanoparticles (NPs) via localized surface plasmon resonances (LSPRs), which are induced on NPs surface by electromagnetic radiation. This spectroscopic approach, known as surface-enhanced Raman spectroscopy (SERS) allows for the single-molecule detection. Such nanoparticles can be grown or at the apex of a scanning probe that is used in atomic force microscopy (AFM) or scanning tunneling microscopy (STM). If this probe is positioned above the sample of interest and illuminated with electromagnetic radiation, the nanoparticle would enhance the Raman signal from molecules located directly under it. The advantage of this methodology, known as tip-enhanced Raman spectroscopy (TERS), is that the probe position can be precisely controlled over the substrates surface. Consequently, collection of TER spectra at different regions of the substrate allows for an acquisition of a chemical map of the analyzed specimen with nanometer spatial resolution. In this talk, I will demonstrate how RS, SERS and TERS can be used in various research areas ranging from biochemistry and electrochemistry to forensics and material science.
For more information contact: Dr. Anzhong Wang 254-710-2276