Bulletin of the American Physical Society
77th Annual Meeting of the Southeastern Section of the APS
Volume 55, Number 10
Wednesday–Saturday, October 20–23, 2010; Baton Rouge, Louisiana
Session GB: Carbon Nanotubes: From Synthesis and Characterization to Functionalization and Devices |
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Chair: Mark Jack, Florida A&M University Room: Nicholson Hall 109 |
Friday, October 22, 2010 10:45AM - 11:15AM |
GB.00001: Effect of Polymer Conformation on Wrapping with Carbon Nanotubes Invited Speaker: We have employed first-principles density-functional calculations for investigating the effect of polymer conformations on the helical wrapping of carbon nanotubes and the selective enhancement of individual carbon nanotubes. Our attention is directed to the electronic structure effects associated with the polymer conformations. The calculation results are compared with the experimental investigations of using poly[(\emph{p}-phenylenevinylene)-\emph{co}-(\emph{p}- phenyleneethynylene)] (PPE/PPV) for selecting specific single- walled carbon nanotubes. [Preview Abstract] |
Friday, October 22, 2010 11:15AM - 11:45AM |
GB.00002: Parallel fabrication of CMOS compatible single walled carbon nanotube field effect transistor and single electron transistor devices Invited Speaker: Parallel fabrication of Complementary Metal Oxide Semiconductor (CMOS) compatible single walled carbon nanotube (SWNT) electronic devices is of great importance for nanoelectronic applications. Here we will summarize our recent progress on the fabrication of SWNT field effect transistors (FETs) and single electron transistors (SETs) with high yield using high quality SWNT aqueous solutions in combination with AC dielectrophoresis. We will show high quality FET devices using individual as well as aligned arrays of SWNTs. We will also demonstrate controlled fabrication and low temperature electron transport properties of SWNT SETs using a novel mechanical templating technique that we have recently developed. [Preview Abstract] |
Friday, October 22, 2010 11:45AM - 12:15PM |
GB.00003: Solid phase of Krypton on a carbon nanotube Invited Speaker: Krypton is known to form commensurate (CS) and incommensurate (IS) solid phases on top of flat graphite. Similar phases are expected to form on the surface of a carbon nanotube (NT), provided that the radius (R) is large enough. For smaller radii, the increasingly important effect of the curvature would eventually alter qualitatively the phase diagram preventing some phases and/or allowing new ones. Recently obtained experimental results of the adsorption of Kr and Ar on a single nanotube, show several quite remarkable, nearly vertical transitions. Those steps are observed and interpreted as cylindrical surface analogues of 2D monolayer transitions: vapor to commensurate solid (CS) and to an incommensurate solid (IS) phase coating the nanotube's surface. Our Monte Carlo simulations for Krypton and Argon on the external surface of an isolated single-walled carbon nanotube show an IS phase comparable to the experiment, however with a different density that may be attributed to an underestimation of the strength of the potential used in the simulations. In the simulations for Kr, a CS is also found provided that the potential used is anisotropic. [Preview Abstract] |
Friday, October 22, 2010 12:15PM - 12:45PM |
GB.00004: Quantum transport in carbon nanorings for metamaterials applications Invited Speaker: Central theme of this theoretical study is quantum transport on carbon nanoring surfaces under microwave illumination and the transmission of electromagnetic energy across a two-dimensional array of properly aligned toroidal carbon nanotubes for metamaterials applications. In a classical description, electromagnetically driven electronic surface currents in the rings will themselves generate in multipole radiation to interfere with an incoming polarized wave front, which may lead to new optical response characteristics created e.g. by the chiral features of the underlying mesoscopic structures. Possible applications ranging from quantum computing to new energy harvesting technologies could be envisioned. At these mesoscopic scales however a proper quantum mechanical treatment of these coherent electronic oscillations in form of \textit{surface plasmon-polaritons (SPPs)} that travel along the toroidal surfaces is necessary. The main effects of SPPs in charge transport can be described in a simplified Hubbard model that allows a generalization of single-electron tightbinding transport calculations in a non-equilibrium Green's function formalism. An existing Fortran code is being expanded to include these quantum many-body effects by calculating the transport Green's function G$_{F}$ using highly optimized, parallel matrix inversion routines in an object-oriented C++ code with the ScaLAPACK library on NSF \textit{TeraGrid} resources (TACC). Multiparticle quantum effects can thus be treated accurately and quickly for realistic nanoring device sizes of few 10,000 carbon atoms or more. The influence of different torus dimensions and relative alignments may be studied on how electromagnetic energy is stored and transmitted across the metamaterial. Additionally, in a collaboration with the Georgia Institute of Technology the influence of electron-phonon coupling on transport for low-energy vibrational modes is investigated, crucial for understanding true nanodevice performance when including dissipation. This project was partially supported as a summer research project under the 2010 NCSI/Shodor Petascale Computing Undergraduate Summer Internship and the 2010 NSF TeraGrid \textit{Pathways} Summer Faculty Fellowship Program. [Preview Abstract] |
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