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CAMP Seminar: PROBING THE NANOSTRUCTURED MATERIALS ATOM BY ATOM: AN ULTRA-HIGH RESOLUTION ABERRATION-CORRECTED ELECTRON MICROSCOPY STUDY

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Nasim Alem, The Pennsylvania State University
When
31 October 2017 from 3:30 PM to 4:30 PM
Where
339 Davey Laboratory
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Defects and interfaces can have a profound effect on the macroscale physical and chemical properties of nanostructures through modifying their local atomic and electronic structure.  While defects and interfaces have been a well-studied subject for decades, we know little about their local atomic and chemical structure, structural distortions, and their stability and transition dynamics.  The past decade has seen incredible progress in the ability to image the atomic and chemical structure of crystals with the development of aberration-corrected transmission electron microscopy. Using low dose aberration-corrected scanning/transmission electron microscopy (S/TEM) imaging and spectroscopy, this presentation will focus on our recent efforts in probing the atomic and chemical structure of defects, their stability and dynamics, and their sub-Angstrom structural distortions in various nanostructures such as 2D crystals and carbon nanothreads.  This talk will also present our current efforts in determination of the quantitative structural distortions and polarization effects at the interfaces and domain walls in 2D crystals and complex oxide systems.

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