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Monday, February 09, 2009
10:00 AM - 11:00 AM
CNLS Conference Room (TA-3, Bldg 1690)


Self-assembly of nanostructures: from nanowires to complex polymer assemblies

Teng Yang
Physics and Astronomy Department, Michigan State University

The rapid development of nanotechnology has led to demands on new low-dimensional materials and processes to create an entirely new generation of application in electronics, energy and other areas. For the materials, carbon nanotubes have got most attention. A major drawback is the current inability to synthesize or to isolate nanotubes with a given diameter and chiral angle. In regard to this, recently synthesized transitional metal chalcogenides MoSI nanowires seem to offer a good number of advantages over conventional carbon nanotubes. I will talk about their interesting structural, unexpected electronic properties, unusual mechanical flexibility and transport properties.

The ultimate goal is to develop an efficient nano-template to enable a high-rate bottom-up directed assembly of these nanowires for application. I will talk about the fullerene C60 functionalized with complex polymers on top of metal surfaces for possible nanotemplates, their different patterns of superstructure and the energy hierarchies behind.

References: 01) Bogdan Diaconescu, Teng Yang, Savas Berber, et. al, Phys. Rev. Lett. 102, 056102, (2009) "Molecular self-assembly of funtionalized fullerenes on a closed packed metal surface" 02) Teng Yang, Savas Berber, and David Tomanek, Phys. Rev. B 77, 165426 (2008) "Compositional ordering and quantum transport in Mo6S9-xIx nanowires: Ab initio calculations" 03) Teng Yang, et. al, J. of Chem. Phys. 128, 124709 (2008) "Self-assembly of long chain alkanes and their derivatives on graphite" 04) Igor Popov, Teng Yang, et. al, Phys. Rev. Lett. 99, 085503 (2007) "Unique Structural and Transport Properties of Molybdenum chalcogenide nanowires" 05) Teng Yang, et. al, Phys. Rev. Lett. 96, 125502 (2006) "Interplay between structure and magnetism in Mo12S9I9 nanowires"

Host: Sergei Tretiak