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Learn • Network • Advance 24 M O N D a Y 2008 137th Annual Meeting & Exhibition 9:45 AM Low Temperature Growth of ZnO Nanorods and Nanotubes by Atomic 2008 Nanomaterials: Fabrication, Properties, and Layer Deposition for the Application of Field Emission: Yung-Huang Chang1; Applications: CNT Chih Chen1; 1National Chiao Tung University Sponsored by: The Minerals, Metals and Materials Society, TMS Electronic, Magnetic, Self-organized ZnO nanorods and nanotubes are grown on Si substrates by and Photonic Materials Division, TMS: Nanomaterials Committee using AAO as a template and ALD to deposit ZnO. With the aid of the ALD, Program Organizers: Wonbong Choi, Florida International University; Seong Jin the deposition temperature can be lowered down to as low as room temperature, Koh, University of Texas at Arlington; Donna Senft, US Air Force; Ganapathiraman and no any metal catalysts or seed layers are needed. Each individual nanorod Ramanath, Rensselaer Polytechnic Institute; Seung Kang, Qualcomm Inc or nanotube is perpendicular to the Si substrate. We controlled the diameter and thickness of AAO template to modify the morphology of ZnO nanorod arrays. Monday AM Room: 273 The screening effect and field enhancement were investigated to obtain the March 10, 2008 Location: Ernest Morial Convention Center best parameters for the application of field emission. In addition, the nanorods Session Chairs: Wonbong Choi, Florida International University; Seung Kang, and nanotubes were annealed at 700°C for one hour under oxygen ambient, Qualcomm Inc and their average grain size grew up from 11 nm to 15 nm. The results of photoluminescence, TEM, and the performances of field emission for the ZnO nanorods and nanotubes arrays will be presented in the conference. M 8:30 AM Invited O Carbon Nanotubes - Related Technologies and Engineering Concepts: 10:00 AM Pulickel Ajayan1; 1Rice University Deposition of Ultrathin Polymer Films on CNTs for Enhanced Dispersion N Carbon nanotube has an important place in nanotechnology. From and Interfacial Bonding by Plasma Polymerization in CNT-Alumina D nanoelectronics to high strength composites, these structures have shown Composites: Donglu Shi1; Yan Guo1; Hoon Sung Cho1; Jie Lian2; Yi Song1; A promise and there is a large effort world-wide in research and development Jandro Abot1; Bed Poudel3; Zhifeng Ren3; Rod Ewing2; 1University of Cincinnati; Y of these materials. Several start ups and newly initiated activities at large 2University of Michigan; 3Boston College companies on nanotubes bear testimony to the importance of this material Effects of nanoparticle/nanotube surface plasma coating on interfacial in the technologies to come. The focus in our laboratory over the last decade behaviors in single wall nanotubes (CNTs)-Al2O3 nanocomposites was studied A has been on the engineering of these materials through directed assembly and by using high resolution transmission electron microscopy (HRTEM) and M different approaches in synthesis and processing. The talk will present concepts mechanical testing. A unique plasma polymerization method was used to coat that lead to the engineering of individual nanostructures as well as assembled the alumina nanoparticles and CNTs, which were precursors for the composites. architectures that might be used in applications, such as nanoelectronics and The CNTs-Al2O3 nanocomposites were processed by both ambient pressure and sensors, membranes, composites, thermal management and energy related hot press sintering. The HRTEM results showed ultrathin pyrrole films (~ 3 nm) products. The overall scope for this material and our approach in the near term on the surfaces of CNTs and Al2O3 nanoparticles. A distinctive stress-strain curve emerging technologies will be briefly discussed. difference related to the structural interfaces and plasma coating was observed from the composites. The mechanism on the mechanical property enchancement 9:00 AM Invited due to nanoparticle surface plasma coating is discussed. The Evolution of Helical Forms in Nanotube and Nanofiber Growth: Thermodynamic Model and Experiment: Prabhakar Bandaru1; Apparao 10:15 AM Rao2; 1University of California, San Diego; 2Clemson University Epoxidation of Carbon Nanotubes through Controlled Organic Acid The synthesis of helical morphologies of nanotubes and nanofibers, through Treatment: Shiren Wang1; 1Texas Technological University Chemical Vapor Deposition (CVD), has been widely reported and can be made Carbon nanotube (CNT) is the strongest fiber so far and has been regarded practical for a wide variety of applications, e.g., nanoscale mechanical springs the most promising reinforcement for next generation multifunctional high- and electrical inductors. Coiled structures are also scientifically interesting in performance composites. However, the current fabrication challenges have that helices abound in nature, e.g., DNA, proteins etc. and a connection is being seriously restricted these potential applications. In this research, we epoxidized made at the nanoscale between carbon based inorganic and organic structures. carbon nanotubes with controlled organic acid treatment. Scanning Electron I will first briefly review the models, in vogue, for the growth of helical forms Microscope characterization indicated that dispersion of functionalized CNTs in and point out their shortcomings. Second, a thermodynamic model, based on the epoxy resin has been remarkably improved. It is also found that functionalized exclusion volume principles, common in chemical and biological systems, CNTs were well embedded in the polymer resin, suggesting improved interface will be introduced to explain coiling. Third, specific predictions will be made bonding. With only 1wt% loading, epoxidized CNTs/Epoxy composites for the rational synthesis of nano-coils/-helices. Finally, experimental results demonstrated a 50% increase in the Young’s modulus, 32% improvement in the conforming to the above model, on the role of Indium catalyst particles and local tensile strength while un-modified CNTs composites showed worse strength. temperature in influencing the coil pitch in nanotubes/fibers, will be presented. Epoxy group can be converted into different kinds of functionalities through a ring-opening reaction. Therefore, epoxidation of CNTs significantly enriched 9:30 AM the chemistry and facilitated their applications. This investigation provides a Controlled Single-Walled Carbon Nanotubes Growth for High Performance solid foundation for the further industrial application of CNTs. Electronic Devices: Jun Huang1; Wonbong Choi1; 1Florida International University 10:30 AM Single-walled carbon nanotubes (SWNTs) have been proposed as the Fabrication and Mechanical Properties of Carbon Nanotube Reinforced building blocks for future nanoelectronics due to their exceptional electronic and Co Matrix Nanocomposite: Kyung Tae Kim1; Seung Il Cha2; Yong Jin Jeong3; mechanical properties. However, the SWNT devices have often been fabricated Thomas Gemming1; Juergen Eckert1; Soon Hyung Hong3; 1IFW Dresden; by using individual nanotubes, positioned randomly on the substrate. For large 2NIMS; 3KAIST scale applications, it is highly desired to control the SWNTs growth direction The recent application of nanotechnologies to structural materials is a promising so that large arrays of nanotube devices can be fabricated in a reproducible way to produce new strong materials that exceed current limitations. Grain size way. We have demonstrated the aligned growth of SWNTs by varying different refinement is considered as one of the most effective strengthening method parameters, such as electric field, gas flow and substrate. In this presentation, we of materials. At the same time, the addition of carbon nanotubes (CNTs) in a will discuss the effect of these parameters on the directional growth of SWNTs. material is known more effective than conventional reinforcements. Here, CNT/ Co nanocomposites were fabricated by reinforcing the CNTs in nanocrystalline The devices fabricated using these aligned SWNTs demonstrate high Ion/off ratio, high mobility and no hysteresis effect. It is suggested that the aligned nanotubes Co matrix using modified molecular level mixing process. The CNT/Co pearl- can be used for large scale fabrication of SWNT devices for future integrated necklace-structured nanopowders, consisting of Co nanoparticles penetrated by nanotube electronics. CNTs, were fabricated and then consolidated into CNT/Co nanocomposites using 24 LEARN • NETWORK • ADVANCE Technical Program spark plasma sintering. The CNT/Co nanocomposite showed outstanding yield insight gained into the underlying mechanisms and interactions is used to control strength of 1.5 GPa, which is comparable to those of ceramics. This indicates the formation of low-dimensional atomic and molecular architectures. This that the synergistic strengthening mechanism of homogeneously dispersed know-how opens up new avenues in engineering nanomaterials of well-defined CNTs in nanocrystalline metal matrix could extend the limitation of mechanical shape, composition and functionality to be harnessed for future technological properties of materials. applications. 10:45 AM Break 12:30 PM Redox Synthesis of MnOx-CNT Composites for Supercapacitor Applications: 11:00 AM Invited Xianbo Jin1; Shengwen Zhang1; Wuzong Zhou2; George Chen1; 1University of Solution-Processed Transparent and (Semi) Conducting Single Walled Nottingham; 2University of St. Andrews Carbon Nanotube Thin Films: Manish Chhowalla1; 1Rutgers University Direct reaction between
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