Fabrication and Properties of Nanocrystal Materials

When: Thursday, October 11, 2012 at 4:00 pm
Where: DA 114
Speaker: Iriving P. Herman
Organization: Department of Applied Physics and Applied Mathematics, Columbia University, NY
Sponsor: Physics Colloquium

New materials with potentially novel optical, electrical, and mechanical properties and applications can be formed by linking nanocomponents.  One versatile way of doing this is by electrophoretic deposition, which is used to form films of CdSe nanocrystals that are treated with ligands and monomers after formation to avoid fracture and lessen strain.  The assembly of three-dimensional ordered arrays of CdSe nanocrystals and of iron oxide nanoparticles by a microfluidics technique is described, along with following the formation of such supercrystals with real-time SAXS.  Coupling between nanocomponents is important in understanding the new properties these materials may possess. Nanocrystals are coupled to each other to achieve improved thermoelectric performance and to single-walled carbon nanotubes to form hybrid materials. Optical probes are useful in understanding the structure, properties, and applications of nanomaterials, as is seen here by using photoluminescence, to show there is FRET coupling in these hybrid materials, and Raman scattering, to understand the improved catalytic activity that can be achieved by tailoring nanoparticles.

Host: Professor Meni Wanunu