Estimation of dispersion stability of UV/ozone treated multi-walled carbon nanotubes and their electrical properties |
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| Affiliation: | 1. Department of Bionano Technology/Fusion Chemical Engineering, Hanyang University, Ansan 426-791, Republic of Korea;2. Plant Engineering Center, Institute for Advanced Engineering (IAE), Yongin 449-863, Republic of Korea;3. Production Technology R&D Division, Korea Institute of Industrial Technology, Incheon 406-840, Republic of Korea;1. Department of Fusion Chemical Engineering, Hanyang University, Ansan 426-791, Republic of Korea;2. Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 139-743, Republic of Korea;1. Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan;2. School of Polymer Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu 500-757, Gwangju, Korea;3. Institute of Carbon Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan;4. Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeonbuk 565-905, Korea;1. Department of Civil & Environmental Engineering, Hanyang University, Seoul 133-791, Republic of Korea;2. Dept. of Natural Resources and Environmental Engineering, Hanyang University, Seoul 133-791, Republic of Korea;3. ANSTO Institute for Environmental Research, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia;4. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China;5. Department of Environmental Health, Korea University, Seoul, 136-703, Republic of Korea;6. Dept. of Environment and Energy, Sejong University, Seoul 143-747, Republic of Korea |
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| Abstract: | Chemical functionalization of multi-walled carbon nanotubes (MWCNTs) was carried out by UV/ozone treatment. MWCNTs were characterized by elemental analysis, transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR) before and after treatment. The dispersion stability was investigated using UV–vis spectroscopy and a dispersion stability analyzer. Results confirmed the presence of oxygen-containing groups on the MWCNT surfaces by UV/ozone treatment resulting in dispersion stability better than for pristine MWCNTs in polar solvents. A simple method described to investigate the solubility behavior of MWCNTs functionalized with UV/ozone treatment in various organic solvents. To illustrate this concept, CNT dispersions were prepared using UV/ozone treatment with controlled times, and their solubility behavior was represented on three-dimensional graphs using Hansen solubility parameters. Based on these solubility data, a MWCNT/PMMA composite was prepared using an appropriate solvent and the sheet resistance was measured using a four-point probe method. As a result, composites made with MWCNTs having undergone UV/ozone treatment showed lower sheet resistance than CNT composites made from pristine or acid-treated MWCNTs. |
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