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<<  February 07, 2013   >>
Thursday, February 07
2/7 - Seminar (inorganic): Richard Robinson, Cornell University
<p>Richard Robinson - <a href="" target="_blank">Robinson Group website</a><br />Department of Materials Science<br />Cornell University<br />Host: Robert Cava</p>
<p><strong>Chemical and Structural Engineering of Nanomaterials for Energy Devices</strong></p>
<p>In this talk I will discuss our latest results toward realizing nanomaterial energy devices by chemical and structural engineering.  I will discuss our synthesis of hyperbranched cobalt phosphides where we have cracked the normally inert tri-n-octylphosphine oxide (TOPO) and use it as a phosphorous source. I will also discuss our work on chemical engineering surfaces of nanoparticles: 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 (NH<sub>4</sub>)<sub>2</sub>S. 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.</p>
Frick Chemistry Laboratory, Taylor Auditorium  ·  4:30 p.m. 6:00 p.m.