题 目："Nanoscale Chemical Imaging viaScanning Tunneling Microscopy and Advanced Raman Spectroscopy Techniques"
Tip-Enhanced Raman Spectroscopy (TERS) performed under ultrahigh vacuum (UHV) conditions 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 system, further aided by the benefits of Ultra-High Vacuum, is uniquely capable of obtaining surface data that would otherwise be unobtainable with less-specialized methods. By investigating substrate structures, superstructures, and the adsorption orientations obtained from vibrational modes, we extract novel surface-chemistry data at an unprecedented spatial (<1nm) and energy (<10 wavenumber) resolution.
Department of Chemistry,University of Illinois at Chicago, USA.Our group focuses on applying scanning probe-based nanotechnology, including scanning probe microscopy (SPM) and tip enhanced Raman spectroscopy (TERS), to design, synthesize and characterize new nanomaterials and molecular assemblies. We are interested in fundamental science and applications at the nano-scale, including charge transfer, electron localization and generation, photoabsorption and photoemission, which are at the heart of the next generation single-molecule devices.