Condensed-Matter Physics & Materials Science Seminar

"Fundamental Properties and Applicability of Carbon based Nanostructures: Implication for Biomolecular Sensors"

Presented by Yung Woo Park, Department of Physics and Astronomy & Nano Systems Institute-National Core Research, Korea

Thursday, August 19, 2010, 1:30 pm — Small Seminar Room, Bldg. 510

Fundamental properties and applicability of carbon based nanostructures such as polymer
nanofibers, carbon nanotubes and the polymer encapsulated carbon nanotubes
(polymers@CNTs) are investigated. The results of magneto resistance (MR) for
polyacetylene nanofibers show vanishing magneto resistance (VMR) up to 30 tesla in high
electric fields. To understand the VMR in high electric field of polyacetylene nanofibers, the
deconfinement conduction of spinless charged solitons is introduced. On the other hand, our
measurements on polyaniline nanofibers reveal a large MR that shows no decrease in similar
high electric fields proving the polaronic conduction with spin and charge in polyaniline
nanofibers. An electric field modulated high magnetic field switching device can be
developed as a potential application of polyacetylene nanofibers.
The applicability of carbon based nanostructures (conducting polymer nanofibers, carbon
nanotubes and their composites) such as the polymer nanofiber Field Effect Transistors (FET),
ansiotropic FET mobility of pentacene single crystal, PEAPOD single electron transistor
(SET) and random telegraph signal (RTS), CNT gated CNT cross junction, three terminal
CNT nanorelay, single molecule conduction, polymers@CNTs, and electrospun CNT filled
polymer composites are envisaged. The polymers@CNTs can be utilized as highly efficient
light weight rechargeable battery electrodes in Li-polymer batteries. The CNT and
functionalized CNTs are deposited on top of a CMOS chip to apply for biomolecular sensors.

Hosted by: Ivan Bozovic

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