Vertically aligned N-doped CNTs growth using Taguchi experimental design
authors Silva, RM; Fernandes, AJS; Ferro, MC; Pinna, N; Silva, RF
nationality International
journal APPLIED SURFACE SCIENCE
author keywords Nitrogen doping; Carbon nanotubes; Chemical vapor deposition
keywords CARBON NANOTUBE ARRAYS; NITROGEN; OPTIMIZATION; SPECTROSCOPY; STORAGE
abstract The Taguchi method with a parameter design L-9 orthogonal array was implemented for optimizing the nitrogen incorporation in the structure of vertically aligned N-doped CNTs grown by thermal chemical deposition (TCVD). The maximization of the I-D/I-G ratio of the Raman spectra was selected as the target value. As a result, the optimal deposition configuration was NH3 = 90 sccm, growth temperature = 825 degrees C and catalyst pretreatment time of 2 min, the first parameter having the main effect on nitrogen incorporation. A confirmation experiment with these values was performed, ratifying the predicted I-D/I-G ratio of 1.42. Scanning electron microscopy (SEM) characterization revealed a uniform completely vertically aligned array of multiwalled CNTs which individually exhibit a bamboo-like structure, consisting of periodically curved graphitic layers, as depicted by high resolution transmission electron microscopy (HRTEM). The X-ray photoelectron spectroscopy (XPS) results indicated a 2.00 at.% of N incorporation in the CNTs in pyridine-like and graphite-like, as the predominant species. (C) 2015 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0169-4332
year published 2015
volume 344
beginning page 57
ending page 64
digital object identifier (doi) 10.1016/j.apsusc.2015.03.073
web of science category Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter
subject category Chemistry; Materials Science; Physics
unique article identifier WOS:000353802600009
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journal impact factor (jcr 2016): 3.387
5 year journal impact factor (jcr 2016): 3.184
category normalized journal impact factor percentile (jcr 2016): 79.407
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