Abstract
Single wall carbon nanotubes (CNTs) were synthesised by the arc method (He atmosphere) using Pt/WO3, Ni/Co and Ni/Co/Fe, Ni/Y2O3 and NiO/Y2O3 as catalysts. The samples were collected in two regions of reactor: the collar and the wall zones. The presence of oxygen in the catalyst decreased the carbon impurities (amorphous carbon and graphite). Raman scattering and TEM were used as characterisation tools. Different CNT yields were found for the different catalysts: almost zero or a very poor yield for the Pt/ WO3 and ternary Ni/Co/Fe metal catalysts, better and promising results for the Ni/Co catalyst, especially after treatment with nitric acid, and for metal - oxide and oxide - oxide catalysts based on Ni/Y2O3 and NiO/Y2O3.
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