Electrical and Thermal Properties of Carbon Nanotube Polymer Composite Films
- PDF / 1,894,218 Bytes
- 6 Pages / 612 x 792 pts (letter) Page_size
- 46 Downloads / 264 Views
1018-EE13-05
Electrical and Thermal Properties of Carbon Nanotube Polymer Composite Films Enkeleda Dervishi1, Zhongrui Li2, Viney Saini1, Alexandru R. Biris3, Dan Lupu3, Steve Trigwell4, and Alexandru Sorin Biris2 1 Applied Science Department, University of Arkansas at Little Rock, Little Rock, AR, 72204 2 Nanotechnology Center, University of Arkansas at Little Rock, Little Rock, AR, 72204 3 National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj Napoca, RO-3400, Romania 4 Electrostatic & Surface Physics Laboratory, Kennedy Space Center, FL, 32899 ABSTRACT The electrical and thermal properties of carbon nanotubes (CNT)-polymer nanocomposite materials have been studied. The carbon nanostructures were analyzed by several analytical techniques, including Electron Microscopy, Raman Spectroscopy, and X-Ray Photoelectron Spectroscopy. Carbon nanotubes were grown by catalytic chemical vapor deposition on metal/metal oxide catalytic systems using acetylene or other hydrocarbons. Raman Spectroscopy was used to analyze the CNT and CNT-polymer nanocomposite materials. The thermal and electrical properties of these CNT-polymer nanocomposite materials depend on the amount of CNTs in the polymer and also on the uniformity of the CNTs dispersed in the polymer. A reduction in electrical resistivity was observed, as the nanotubesí concentration in the polymeric films increased, while optical transparency remained 85 % or higher relative to acrylic films without nanotubes. 1. INTRODUCTION Carbon nanotubes (CNTs), which were discovered by Iijima [1], are among the most studied materials due to their exceptional electrical, mechanical and optical properties. These properties make them ideal materials for applications ranging from sensors, energy storage mediums, field emitters, and nanocomposite materials with improved electrical, optical and magnetic properties. The morphology and the diameters of the single wall carbon nanotubes (SWCNTs) [2], depend on the methods and the conditions used to produce them. Carbon nanotubesí electrical properties depend on their diameter, length, and chirality [3]. One of the most intensively researched areas is the development of nanocomposite materials (polymeric, ceramics, glasses, metals) that are mechanically stronger, electrically conductive and/or optically transparent [4-7]. A significant potential application is the development of polymeric coatings with extremely fast electrostatic charge dissipation that can be used for nanoelectronic components or devices. Uniform dispersion of CNTs plays an important role in improving the properties of the CNT-composite materials. Mechanical mixing, chemical or electrochemical are used to uniformly disperse the CNTs into the bulk of the polymeric materials. The major challenge of the CNT dispersion is to significantly reduce both the bulk as well as the surface electrical resistivity of the polymer/CNT composites, while keeping the optical transparency to a value higher than 85 to 90 %. The main goal of this work is to
Data Loading...
