High-pressure pyrolysis of melamine route to nitrogen-doped conical hollow and bamboo-like carbon nanotubes |
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| Affiliation: | 1. Key Laboratory of Mesoscopic Chemistry (Ministry of Education), Department of Chemistry, Nanjing University, Nanjing 210093, P. R. China;2. College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, P. R. China;3. State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. China;1. College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China;2. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China;3. Grirem Advanced Materials Co., Ltd, General Research Institute for Nonferrous Metals, Beijing 100088, China;4. School of Materials Science and Engineering, Nankai University, Tianjin 300071, China;5. Tianjin Key Lab and Molecule-based Material Chemistry and College of Chemistry, Nankai University, Tianjin 300071, China;6. College of Chemical Engineering, Fuzhou University, Fuzhou 350116, China;7. Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60612, United States;1. University of Liège, Department of Chemical Engineering - Nanomaterials, Catalysis, Electrochemistry, Institute of Chemistry (B6a), B-4000 Liège, Belgium;2. University of Namur, Research Centre in Physics of Matter and Radiation (PMR), LISE Laboratory, B-5000 Namur, Belgium;1. Department of Chemistry and Chemical Engineering, Jiangxi Normal University, 330022, Nanchang, China;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;1. Department of Advanced Energy Materials, College of Materials Science and Engineering, Sichuan University, Chengdu 610064, PR China;2. Department of Materials Engineering, Sichuan College of Architectural Technology, Deyang 618000, PR China |
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| Abstract: | Nitrogen-doped conical hollow and bamboo-like carbon nanotubes (CNTs) have been prepared by pyrolysis of melamine with NaN3–Fe–Ni and Ni catalysts at high temperature and high pressure, respectively. The conical hollow CNTs with an average diameter of about 70 nm and a length up to 5 μm account for ∼50% of the product, whose N/C atomic ratios are about 0.27. The conical bamboo-like CNTs with the diameter of ∼65 nm and length of 1–4 μm and wall thickness of 10–20 nm account for ∼95% of the product, whose N/C atomic ratios are up to 0.18. The control experiments show that NaN3 plays a key role in keeping high nitrogen content and high conversion ratio in the CNTs. The possible growth mechanisms have been discussed on the base of the experimental observation. The strategy provides an alternative route to nitrogen-doped CNTs and other carbon nitride materials. |
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