Bulletin of the American Physical Society
2006 Texas Section of the APS Joint Fall Meeting
Thursday–Saturday, October 5–7, 2006; Arlington, Texas
Session NM2: Nanomaterials and Magnetism II |
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Chair: Dwight Russell, Baylor University Room: UT Arlington, University Center San Saba |
Saturday, October 7, 2006 10:30AM - 10:42AM |
NM2.00001: Optical Properties of Er$^{3+}$:Y$_{2}$O$_{3}$ nanoparticles for biosensor applications Kelly Nash, Raylon Yow, Doug Dee, Dhiraj Sardar, John Gruber, Maogen Zhang, Waldemar Gorski The optical characteristics of erbium-doped yttrium oxide nanoparticles have been studied for potential use as fluorescent labeling of biomolecules. A comprehensive study of absorption and emission of these nanoparticles is performed. Luminescent properties of the Er$^{3+}$:Y$_{2}$O$_{3}$ nanoparticles are utilized to study bioluminescent resonance energy transfer (BRET). This study will help us characterize optimal conditions for functionalizing these nanoparticles to induce selective interactions between the rare earth-doped nanoparticles and biological species (e.g. proteins, DNA). [Preview Abstract] |
Saturday, October 7, 2006 10:42AM - 10:54AM |
NM2.00002: Reaction Kinetics of Nanostructured Silicon Carbide Kendra Wallis, T.W. Zerda Nanostructured silicon carbide (SiC) is of interest particularly for use in nanocomposites that demonstrate high hardness as well as for use in semiconductor applications. Reaction kinetics studies of solid-solid reactions are relatively recent and present a method of determining the reaction mechanism and activation energy by measuring reaction rates. We have used induction heating to heat quickly, thus reducing the error in reaction time measurements. Data will be presented for reactions using silicon nanopowder ($<$ 30 nm) and carbon multi-walled nanotubes with diameter 60 - 100 nm at five different temperatures below the melting point of silicon. Using the well-known Avrami-Erofeev model, a two-parameter chi- square fit of the data provided a rate constant (k) and parameter (n), related to the reaction mechanism, for each temperature. From these data, an activation energy of 138 kJ/mol was calculated. In addition, the parameter n suggests the reaction mechanism, which will also be discussed. Experiments are continuing at higher temperatures to consider the liquid- solid reaction as well. [Preview Abstract] |
Saturday, October 7, 2006 10:54AM - 11:06AM |
NM2.00003: Atomic Force Microscopy of Cellulose Fibers Robert Friedfeld Cellulose fiber is a naturally occurring material that is of research interest in Biotechnology and Forestry at SFA. Cellulose has been of interest in the wood sciences for some time and more recently in the field of nanotechnology research. In a collaborative effort between the Department of Physics and Astronomy and the Division of Biotechnology, atomic force microscopy is being used in an attempt to acquire data that may be used for comparison with molecular models being developed by researchers in Biotechnology. Preliminary results of this research effort will be presented. [Preview Abstract] |
Saturday, October 7, 2006 11:06AM - 11:18AM |
NM2.00004: Simulation of RHEED Images for a quantitative assessment of pyramidal-shaped quantum dots. Chandani Rajapaksha, Andrea Feltrin, Alexandre Freundlich The understanding of structural and electronic properties of semiconductor nanostructures has become a challenging issue in recent years. Thus far deciphering structural properties of quantum dots(QDs), especially Stranski-Krastanov QDs (SKQDs) has been mainly limited to post-fabrication \textit{ex-situ} microcopy observations and X-ray diffraction characterizations. Real-time monitoring of structural properties during the manufacture of these dots provides with a far more attractive tool as it enables a real time study and tuning of these properties. However considering the complex nature of three dimensional SKQDs, real time monitoring by Reflection high-energy electron diffraction (RHEED), a technique available on most UHV molecular beam epitaxy (MBE) systems has been limited to \textit{qualitative} characterizations. In this study, we have shown through a careful modeling of RHEED patterns the potential for a real time and \textit{in situ quantitative} assessment of SKQD structural parameters during the MBE. The RHEED images are calculated for simulated uncapped InAs SKQDs on GaAs substrate using Kinematical diffraction theory. The calculation is supported by a full atomistic evaluation of strain SKQDs and take into account both diffraction and refraction of electron. A clear correlation is established between the evolution of RHEED patterns and SKQD facet orientations and dot heights. [Preview Abstract] |
Saturday, October 7, 2006 11:18AM - 11:30AM |
NM2.00005: Microwave Resonant Cavity and Loaded Carbon Nanotubes -- A Sensor to Detect Toxins like Methamphetamine Aman Anand, James Robert, Don Henley, Jai Dahiya A resonant cavity operating in TM$_{010}$ mode was used to study the absorption response of Single Walled Carbon Nanotubes and other Nanomaterials for different types of gas molecules. The range of the frequency signal as a probe was chosen arbitrarily between 9.1 -9.8 GHz. A highly specific range will be studied for further experiments. It was found that for different pressures of different gases and different types of Nanomaterials, there was a different response in the shifts of the probe signal for each cycle of gassing and degassing of the cavity. The preliminary work done so far suggests that Microwave spectroscopy of the complex medium of gases and Carbon Nanotubes can be used as a highly sensitive technique in studying the complex dielectric response of different polar as well as non-polar gases when subjected to intense electromagnetic fields within the Cavity. [Preview Abstract] |
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