Birck Nanotechnology Center

Sanjiv Sinha Seminar

November 19 @ 11:00 AM - 12:00 PM - BRK 1001

Title: Selected Studies in Electro-Thermal Transport Physics & Engineering

Abstract: Advanced nanostructures provide unprecedented access to investigate fundamental electro-thermal transport. Experimental observations in such materials often contradict established notions and theoretical assumptions. In this talk, I will describe our recent investigations of transport in several advanced nanostructures of current interest: rough silicon nanowires1-3, polysiliconinverse opals, transfer-printed interfaces4and ultrathin amorphous polymers5. In rough nanowires, our work critically examines the robustness of the Casimirlimit for phonon heat conduction. In polysiliconinverse opals, we examine the interplay between grain boundary and surface scattering for electrons and phonons. In transfer-printed interfaces, we find evidence for capillary mediated conduction. In ultrathin polymers, we show the presence of thermal conductivity percolation. The fundamental insight gained from these studies could open pathways leading to improved thermal management, energy conversion and storage technologies.  We discuss applications in thermoelectricsand thermal storage.

1.J. Sadhu and S. Sinha, Physical Review B, vol. 84, 115450 (2011).
2.M. Seong, J. S. Sadhu, J. Ma, M.G. Ghossouband S. Sinha, J. Applied Physics, vol. 111, 124319 (2012).
3.K. Balasundaram, J.S. Sadhu, J.C. Shin, B. Azeredo, D. Chanda, M. Malik, K. Hsu, J.A. Rogers, P. Ferreira, S. Sinhaand X. Li, Nanotechnology , vol. 23, 305304 (2012).
4.D-W Oh, S. Kim, J.A. Rogers, D. Cahill and S. Sinha, Advanced Materials, vol. 23, 5027 (2011).
5.M. G. Ghossoub, J. H. Lee, O. T. Baris, D. G. Cahill and S. Sinha, Physical Review B, vol. 82, pp. 195441(2010).

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