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Controlled Alignment of Carbon Nanotubes and Their Applications
- Alternative Title
- 탄소나노튜브의 조절 가능한 정렬 및 응용
- Author(s)
- 염철
- Advisor
- 김재호
- Department
- 일반대학원 분자과학기술학과
- Publisher
- The Graduate School, Ajou University
- Publication Year
- 2005
- Language
- eng
- Alternative Abstract
- Many areas in the application of carbon nanotubes (CNTs) require information regarding defects on the surface of CNTs since thermal stability, electronic and transport properties of CNTs are significantly affected by the distribution, density, and nature of defects on CNTs. In this study, we introduce a novel method to locate and quantify defects of multi-walled carbon nanotubes (MWNTs) using gold nanoparticles. Affinity of defect sites to Au nanoparticles was provided by formation of thiol functionality through chemical oxidation and amidation of damaged aromatic carbon moiety. Transmission electron microscopic and scanning electron microscopic measurements showed that the defect sites are effectively located with gold nanoparticles by formation of Au-S chemical bonds on surface of MWNTs. Chemisorption of Au nanoparticles on MWNTs was further verified by observation of reductive desorption peak in cyclic voltammograms. Assembly and characterization of Au nanoparticles on CNTs can serve to extend potential applications of CNTs in various areas of nanotechnology. Purification and solubilization of Single-Walled Carbon Nanotubes (SWNTs) have been researched as fundamental process for its application. It is commonly reported by many nano-scientists that chemical oxidation with strong acids, thermal treatment, and their combination are effective purification methods of SWNTs. Also, their solubilization is accomplished through various functionalization. These existing methods, however, are complicated and limited in repetition. Carbonaceous impurities formed from degradation of SWNTs during severe chemical oxidation are easily separated from SWNTs because the difference of their solubility in water is maximized by triton X-100. These purified SWNTs have good colloidal characteristic in polar solvents such as water, DMF, and ethanol. We describe a method of generating highly aligned, patterned single-walled CNT films over large-areas using the LB technique. Moreover the SWNT films can be subsequently transferred onto either homogeneous or pre-patterned solid substrates to form aligned SWNT films. Importantly, the electrical conductivity of the resulting SWNT films parallel to the tube axis was found to be ~ 15 times higher than that perpendicular to the axis, reflecting anisotropic electrical properties due to the uniaxial alignment of individual SWNT bundles.
- Fulltext
- Appears in Collections:
- Graduate School of Ajou University > Department of Molecular Science and Technology > 3. Theses(Master)
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