Wednesday, February 16, 2011, 10:00 am — CFN, Bldg 735, Conference Room B
In this presentation, I will highlight my research accomplishments in the fields of nanoscience, heterogeneous catalysis, and surface science. The main emphases of this research have been surface nanostructure fabrication; atomic-scale characterization of surface atomic and electronic structures; and determination of relationships between structure and properties of nanomaterials. To achieve these goals, I have utilized a variety of surface analytical instruments including Scanning Tunneling Microscopy (STM), Photoelectron Spectroscopy (UPS, XPS), Temperature Programmed Desorption/Reaction (TPD/R). Three examples of my results are shown below:
1. Size/composition dependent catalytic/selective activities of nanoclusters on oxide supports.
In an effort to atomic-level understand nanostructured catalysts, we deposit size, composition, and energy-selected nanoclusters of gold, silver, vanadium, and vanadium oxide on TiO2 (110)-(1×1) surfaces in ultra-high vacuum using a mass-selected cluster source. I will discuss the atomic-scale structural characterization of these adsorbed mass-selected nano clusters and their chemical and catalytic properties.
2. Fabrication of hybrid organic-silicon surface nanostructures via surface chain reaction.
The ability to control molecular adsorption on semiconductor surfaces has several key applications towards the innovation of new molecular-scale devices. In this part of my talk, I will discuss my investigations into the self-directed assembly of organic nano-scaled structures on a H-Si(100)-(3×1) surface. I will also show a new mechanism using ring-opening radical clock reactions to prepare hybrid organic-silicon surface nanostructures on the H-Si(100)-(2×1) surface.
3. Surface reconstruction-dependent electrical conductivity.
Two-dimensional (2D) materials with single-atom thickness were fabricated by controlling adsorbate-induced surface superstructures on Si(111) surfaces. The relationships between surface
Hosted by: Peter Sutter
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