Upscaling potential of the CVD stacking growth method to produce dimensionally-controlled and catalyst-free multi-walled carbon nanotubes
authors Mata, D; Silva, RM; Fernandes, AJS; Oliveira, FJ; Costa, PMFJ; Silva, RF
nationality International
journal CARBON
keywords CHEMICAL-VAPOR-DEPOSITION; FILAMENTOUS CARBON; DIFFUSION; IRON; NANOTOXICOLOGY; NANOPARTICLES; TOXICITY; KINETICS; DEACTIVATION; MULTILAYERS
abstract Multi-walled CNTs (MWCNTs) with structural characteristics optimised for bio-applications have been produced using a catalyst-supported chemical vapour deposition (CVD) method. The upscale potential of the process was demonstrated by combining classical semi-continuous and stacked-growth modes. The vertically aligned MWCNT films thus obtained were multi-layered with five continuous strata of well-structured nanotubes. Following gentle disentanglement, the stacks were converted to individual MWCNTs with short dimensions (a final length and diameter of similar to 1.2 mu m and similar to 12 nm) and almost catalyst-free (<0.04%). Overall, our process produces dispersed, bio-tailored MWCNTs with an output growth-yield 20 times higher than a standard CVD setup and exempt of complex or destructive post-growth steps of purification and separation. These constitute key steps towards the mass production of MWCNTs with low toxicological risks, an essential prerequisite for biomedical applications. (C) 2012 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0008-6223
year published 2012
volume 50
issue 10
beginning page 3585
ending page 3606
digital object identifier (doi) 10.1016/j.carbon.2012.03.030
web of science category Chemistry, Physical; Materials Science, Multidisciplinary
subject category Chemistry; Materials Science
unique article identifier WOS:000305851700026
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journal impact factor 7.082
5 year journal impact factor 7.088
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