Preparation and modification of carbon nanotubes |
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| Affiliation: | 1. School of Science, Shanghai University, Shanghai, 200444, China;2. School of Material Science and Engineering, Shanghai University, Shanghai 200072, China;3. Center of Nano-Material and Technology, Wuhan University of Science and Technology, Wuhan, 430081,China;1. Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, No.5 Xin Mofan Road, Nanjing 210009, PR China;2. Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Energy, Nanjing Tech University, No.5 Xin Mofan Road, Nanjing 210009, PR China;3. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, PR China;4. Faculty of Engineering, Computing and Science, Swinburne University of Technology, Jalan Simpang Tiga, 93350 Kuching, Sarawak, Malaysia;5. Department of Chemical Engineering, Curtin University, Perth, WA 6845, Australia;1. Egyptian Petroleum Research Institute, Cairo, Egypt;2. EPRI Nanotechnology Center, Egyptian Petroleum Research Institute, Cairo, Egypt |
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| Abstract: | Carbon nanotubes (CNTs) were prepared by the catalytic decomposition of methane at 680 °C for 120 min, using nickel oxide–silica binary aerogels as the catalyst. The morphological structure of CNTs was investigated by transmission electron microscopy (TEM), X-ray Diffraction (XRD) and Raman spectroscopy. The results revealed that CNTs with diameter 40–60 nm showed high quality, uniform diameter and high length/diameter ratio, the wall structure of CNTs was similar with that of highly oriented pyrolytic graphite (HOPG), and some metal catalyst particles were encapsulated at the tip of CNTs. Different methods were compared to modify CNTs. Investigated by TEM, XRD, Raman spectroscopy and nitrogen adsorption/desorption for modified CNTs, it was confirmed that after modification treatment by immersion in diluted HNO3 solution with ultrasonic and then milling by ball at a high velocity, the metal catalyst particles at the tip of CNTs disappeared, the unique cylinder wall structure remained, the CNT length became short, the cap at the tip of nanotube was opened, and thus the internal surface area could be effectively used, leading to the increase of the specific surface area and pore volume. This technique is relatively simple and effective for modifying CNTs which can be scaled up for industrial applications. |
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