摘要
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 degrees 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 degrees 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. (C) 2013 Elsevier B.V. All rights reserved.