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SUMMARY:Other:Controlling Localized Surface Plasmons via an Atomistic Approach: Chemical Analysis at Angstrom Scale and Site-Selective Reactions at Sub-Molecular Scale
DESCRIPTION: My research group is interested in investigating how local chemical environments affect single-molecule behaviors with angstrom scale resolution. This talk will start from Tip-Enhanced Raman Spectroscopy (TERS)\, which affords the spatial resolution of traditional Scanning Tunneling Microscopy (STM) while collecting the chemical information provided by Raman spectroscopy. By using a plasmonically-active material for our scanning probe\, the Raman signal at the tip-sample junction is incredibly enhanced\, allowing for single-molecule probing. This method\, further aided by the benefits of ultrahigh vacuum\, is uniquely capable of controlling localized plasmons via an atomistic approach. We are able to obtain (1) single-molecule chemical identification\; (2) the configurations and orientations of individual molecules on the surface\; (3) adsorbate-substrate interactions in the ordering of molecular building blocks in supramolecular nanostructures\; (4) local strain effects in an organic/2D materials heterostructure. By investigating substrate structures\, superstructures\, 2D materials lattices\, and the adsorption orientations obtained from vibrational modes\, we extract novel surface-chemistry information at an unprecedented spatial (< 1 nm) and energy (< 10 wavenumber) resolution. Another application of localized surface plasmons is to achieve site-selective chemical reactions at sub-molecular scale. We recently selectively and precisely activated multiple chemically equivalent reactive sites one by one within the structure of a single molecule by scanning probe microscopy tip-controlled plasmonic resonance. Our method can interrogate the mechanisms of forming and breaking chemical bonds at the angstrom scale in various chemical environments\, which is critical in designing new atom- and energy-efficient materials and molecular assemblies with tailored chemical properties.                                                \n                       \n                                                \n                       \nNan Jiang (University of Illinois Chicago)
UID:84370-21623616@events.umich.edu
URL:https://events.umich.edu/event/84370
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Biosciences,Chemistry,Science
LOCATION:Chemistry Dow Lab - 1640
CONTACT:
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