Materials Research Laboratory

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Materials Science and Engineering Colloquium

Event Type
MatSE Department
100 Materials Science and Engineering Building
Oct 28, 2013   4:00 pm  
Brad Chmelka, Department of Chemical Engineering, University of California, Santa Barbara
Originating Calendar
MatSE Seminars

"Molecular interactions and surfaces in nanostructured semiconductors" - The properties of nanostructured materials often depend on their small characteristic dimensions and the heightened roles of surface effects, compared to bulk solids. Advances in syntheses, molecular characterization, and modeling of nanoscale materials increasingly enable their compositions, structures, and morphologies to be adjusted, probed, and correlated, at a molecular level, with their macroscopic physicochemical properties. In particular, solid-state nuclear magnetic resonance (NMR) spectroscopy, in conjunction with X-ray scattering, electron microscopy, and modeling calculations, yield detailed insights on local bonding environments, interactions, and dynamics in nanostructured semiconductor materials. Such analyses provide new understanding of structure-function relationships at the nanoscale, especially on molecular interactions and complicated orderdisorder near heterostructure surfaces. Recent results will be presented for organic and hybrid photovoltaic materials and for Group II-VI nanocrystals, as representative examples. The influences of surface interactions and distributions of compositional or structural order-disorder will be discussed with respect to the macroscopic properties of nanostructured semiconductors and their optoelectronic applications

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