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Physics Colloquium: Nanoscale infrared spectroscopy to explore materials properties at the nanoscale

This is a past event.

Friday, September 27, 2019 at 1:30pm to 2:30pm

PG6 - Tech Station, 112
11200 SW 8th ST 33199, PG6 - Tech Station, Miami, Florida 33199

Professor L. Tetard

Department of Physics and NanoScience Technology Center,

University of Central Florida, Orlando, Florida

Abstract: Advances at the forefront of nanoscale functional imaging and spectroscopy have deepened our fundamental understanding of materials at the nanoscale. In particular, the combination of atomic force microscopy (AFM) and optical probing, such as with infrared (IR) spectroscopy, has paved the way to new capabilities of the nanoscale toolbox, beyond surface topography measurements.  The technique coined AFM-IR enables chemical speciation at spatial resolution well beyond the diffraction limit. With such new capabilities, exploring intricate arrangements in nanostructured materials becomes attainable.

In this talk, the developments in nanoscale infrared spectroscopy will be presented. An overview of the different modes of operation available to collect chemical information at the nanoscale, including contact mode, tapping mode, and multi-frequency AFM will be discussed. Developments of multifrequency AFM for chemical mapping and localized infrared spectroscopy will be explored in more details, with a focus on considering the nonlinear nature of the tip-sample interaction. Some connections between the underlying dynamic of these interactions and the mechanisms of image formation will be offered.  Finally, several applications for which AFM-IR advances prove critical will be highlighted, including for two-dimensional materials and biological systems.

Short bio

Dr. Tetard is currently an Associate Professor in the Physics Department and NanoScience Technology Center at the University of Central Florida in Orlando, Florida. She is the recipient of an NSF CAREER 2019 Award. Her group focuses on developing new nanometrology platforms and on demonstrating the performance of the new tools to study complex systems. Before joining UCF in 2013, she was a staff researcher and Eugene P. Wigner fellow at the Oak Ridge National Laboratory. During her tenure at the Oak Ridge National Laboratory, she initiated some developments of multi-frequency Atomic Force Microscopy for subsurface imaging and for infrared nanoscale spectroscopy. She received her PhD in 2010 from the University of Tennessee-Knoxville. Dr. Tetard has authored over 50 publications in refereed journals as well as several book chapters, and she has contributed to several patents, one of which received an R&D100 Award in 2010.

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