Skip to main content Skip to secondary navigation
nano@stanford/NNCI and Horiba Scientific present:

Raman Universe - a Perfect Guide to Stellar Research

Short course on Raman Spectroscopy

Tuesdays, 10am PST:

March 16th, 23rd, 30th

April 6th, 20th

Raman Universe - a Perfect Guide to Stellar Research

Main content start

This year we were planning to invite Horiba Scientific for a traditional, in-person workshop focused on advanced applications of Raman spectroscopy. Sadly, due to the pandemic, we had to settle on an online event. Therefore, it is our great pleasure to announce the first virtual nano @ stanford Raman Workshop, co-hosted with our friends from Horiba Scientific, entitled Raman Universe - a Perfect Guide to Stellar Research.

The event will take place over the course of the next 6 weeks, with 2 hour sessions being broadcast live on Zoom "almost" every Tuesday. The agenda and titles for the first 4 sessions is posted below; the topic of the last session will be selected by YOU, so please vote using the Google Forms link!

Each session will start at 10:00am Pacific Time and will consist of a 90 minute lecture and an open 30 minute Q&A session were additional topics can be brought up for discussion.

Agenda

March 16th Raman Spectroscopy: Fundamentals, Applications and Instrumentation
Watch the recording.
March 23rd Raman Imaging: Visualizing the Spatial Variation of Chemical Bonding and Solid State Structure
Watch the recording.
March 30th Raman Crystallography: Applying Raman Polarization Selection Rules in Theory and Practice
Watch the recording.
April 6th Raman and PL at the nanoscale- why it really matters for the 2D materials
Watch the recording.
April 20th

Raman Topics chosen by Attendees:

  • Solid state structure: Crystalline, amorphous, microcrystalline and nanocrystalline
  • Polarized Raman
  • Photoluminescence spectroscopy using a Raman spectrometer
  • Stress and strain

Watch the recording.

Abstracts

David Tuschel, Raman Applications Scientist, HORIBA Scientific

Raman Spectroscopy session and Raman Imaging session (March 16th and 23rd)

The first two presentations in the Stanford Raman Workshop will teach introductory Raman spectroscopy and imaging. The chemical bond origins of Raman scattering along with the instrumentation used to acquire Raman spectra and images will be explained. Resonance Raman effects and their dependence on laser excitation wavelength will be taught. Regarding instrumentation and spectral acquisition, participants will learn about lateral and axial spatial resolution, detection limits, and laser polarization in micro-Raman sampling. We will also discuss the importance of spectral resolution and how to apply it when rendering a Raman image. Regarding applications, we will show examples of how Raman spectroscopy provides insight into the energetics of molecular interactions in the liquid and vapor phases, and that it can be used to distinguish crystalline polymorphs and differentiate single crystal, polycrystalline and amorphous materials in the solid state. The effects of chemical bonding, strain and crystallite size on Raman spectra will be addressed and we will show you how to image these characteristics.  In addition, we will discuss how combined spectral imaging by laser excited photoluminescence and Raman scattering can be used to reveal the spatially varying solid-state structure of materials.

David Tuschel, Raman Applications Scientist, HORIBA Scientific

Raman Crystallography session (March 30th)

This presentation will cover some basic theory and practical implications regarding the application of polarization selection rules for Raman spectroscopy of solids. In addition, we will present some clear and practical methods for the application of these rules to obtain more information about solid state structure using Raman spectroscopy. Polarization - Orientation (P-O) Raman spectroscopy can be used to identify vibrational modes, determine crystal structure, distinguish allotropes and polymorphs, differentiate single from polycrystalline materials, and determine orientation of the crystal and degree of disorder, all on a micrometer scale. P-O Raman spectroscopy can be an important analytical tool because of its complementarity to X-ray diffraction. Here, we explain the theoretical basis for P-O micro-Raman spectroscopy and provide several examples to demonstrate its feasibility and beneficial application.

Andrey Krayev, AFM-Raman Product Manager, HORIBA Scientific

Raman and PL at the Nanoscale: Why it Really Matters for the 2D Materials (April 6th)

In prior lecture we already discussed how Raman imaging can help identifying heterogeneities in 2D materials. Quite often the scale of structural or electronic or morphological heterogeneity in these materials is on the order of few tens of nanometers or less, which is beyond the spatial resolution of conventional Raman microscopy.  Tip enhanced Raman scattering (TERS) and tip enhanced photoluminescence (TEPL) can address the problem of spatial resolution. In this lecture we’ll demonstrate how TERS and TEPL imaging can probe number of nanoscale heterogeneities in 2D crystals: growth related, including lateral and vertical heterostructures, substrate induced, and the morphological heterogeneities that appear (intentionally or not) in the process of exfoliation/ 2D crystal transfer. Finally, we’ll discuss a hot-fresh results on TERS imaging of reconstructed Moire patterns in twisted bilayers of graphene.

Speaker Bios

Short Biography

David Tuschel

David Tuschel is currently a Raman Applications Scientist at HORIBA Scientific. In this capacity he supports customers in applied Raman spectroscopy. David also shares responsibility with Fran Adar of HORIBA for authoring the Molecular Spectroscopy Workbench, which appears regularly in Spectroscopy magazine. Prior to joining HORIBA, David was a Senior Researcher at the University of Pittsburgh from 2009 to early 2011 working on UV resonance Raman spectroscopy of explosives. He was the Principal Materials Scientist at ChemImage from 2002 to 2008. David was a research scientist and Raman spectroscopist at Kodak from 1985 to 2002 during which time he developed Polarization-Orientation Micro-Raman techniques for the characterization of solid state materials in general and photonic and microelectronic devices in particular. David received his M.S. degree in Chemistry from the University of Arizona under the direction of Prof. Jeanne E. Pemberton. His research involved the study of surface enhanced Raman scattering (SERS) and its dependence on electrode kinetics.

Short Biography

Andrey Krayev

Andrey Krayev received the Graduate degree from the Moscow Institute of Physics and Technology, in 1991. In 2001, he started to use SPM, when working as an application scientist for QPT, Inc. Since 2008, he has been a CTO at AIST-NT, Inc. He is actively involved in development of TERS technique and its implementation for real world application. After acquisition of AIST-NT technology by HORIBA in July of 2017, Andrey holds the position of the US AFM-Raman product manager for Horiba Scientific. He continues active development of TERS-related applications for advanced characterization of 2D materials and beyond.