Purity-controllable growth of bamboo-like multi-walled carbon nanotubes over copper-based catalysts |
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| Affiliation: | 1. Residues and Resource Reclamation Centre (R3C), Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Clean Tech One, 637141, Singapore;2. School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;1. Department of Physics, Dalian Maritime University, Dalian, Liaoning, 116026, China;2. Department of Applied Physics, Aalto University School of Science, Puumiehenkuja 2, 00076, Aalto, Finland;3. MultiScale Material Science for Energy and Environment, Massachusetts Institute of Technology-CNRS Joint Laboratory at Massachusetts Institute of Technology, Cambridge, MA, 02139, USA;4. Aix-Marseille University and CNRS, CINaM UMR 7325, 13288, Marseille, France;1. School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, Guangxi 541004, China;2. Zhengzhou Research Institute of Aluminum Corporation of China, Zhengzhou 450041, China |
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| Abstract: | The growth of bamboo-like multi-walled carbon nanotubes (CNTs) without the formation of amorphous carbons was performed using copper-based catalysts by catalytic chemical vapour deposition (CVD) with diluted ethylene at 700–900 °C. The as-grown CNT soot was characterised by transmission electron microscopy, thermogravimetric analysis and Raman spectroscopy. The weak metal–support interaction of a sulphate-assisted copper catalyst (CuSO4/SiO2) can provide high-purity growth with remarkable yields of CNTs (2.24–6.10 CNT/g Cu·h) at 850–900 °C. Additionally, hydrogen-assisted CVD can activate inert copper catalysts, e.g., Cu(NO3)2/SiO2 or Cu(CH3COO)2/SiO2, for the growth of CNTs. |
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