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Event Detail Information

Event Detail Information

Speaker Richard Robinson, Department of Materials Science and Engineering, Cornell University
Date Apr 22, 2013
Time 4:00 pm  
Location 100 Materials Science and Engineering Building
Sponsor Materials Science and Engineering Department
Event type seminar
Views 1607
Originating Calendar MatSE Seminars
"Chemical and structural engineering of nanomaterials for energy devices" - In this talk I will discuss our latest results toward realizing nanomaterial energy devices through chemical and structural engineering. I will discuss our work on chemical engineering surfaces of nanoparticles toward creating nano-dot solids that are conducting: we have developed a novel surface modification method to link colloidal nanoparticles together through inorganic bridges. Our method completely removes the bulky surfactant ligands from both II-VI and IV-VI semiconducting nanocrystal films using (NH4)2S. I'll also discuss our chemical and structural engineering of cobalt nanoparticles to create additive-free battery electrodes ' anodes made without polymeric binders or carbon black. We have found that electrophoretic deposition (EPD) of nanoparticles creates a strong enough electrical and mechanical bond for the nanoparticle batteries to perform at maximum capacity. Finally, I'll discuss our new structural characterization tool, where we have developed a microfabricated phonon spectrometer. Non-thermal distributions of phonons are locally excited and detected in silicon micro- and nanostructures by decay of quasiparticles injected into an adjacent superconducting tunnel junction. In our prototype phonon spectrometer we have demonstrated spatial resolution of 200 nm, a frequency resolution of ~20 GHz, and a frequency range from ~80 to ~800 GHz. Our results on Si nanosheets indicate that the Casimir limit is reached at much lower frequencies than previously believed.
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