Carbon nanotubes precursor solution

The high purity carbon nanotubes (CNTs) used in this study were obtained by decomposition of acetylene over a powdered CoxMgi xO solid solution catalyst [19]. Different proportions of CNTs from 15 to 70% and polyacrylonitrile (PAN, Aldrich) have been mixed in an excess of acetone to obtain a slurry. After evaporation of acetone, precursor electrodes were formed by pressing the CNTs/PAN mixture at 1-2 tons/cm2. The C/C composites were formed by carbonisation of the pellets at 700-900°C for 30-420 min under nitrogen flow [20], The optimal capacitance properties of the composite were obtained for a mixture CNTs/PAN (30/70 wt%) treated at 700°C. Such C/C composite remains still quite rich in nitrogen (9 at% of N) demonstrating that PAN is an efficient nitrogen carrier. On the other hand,... 

One-dimensional (ID) nanostructures of various materials including multi-walled carbon nanotubes have been prepared by NSP of precursor solutions. For the growth... 

Multiwalled carbon nanotubes (MWCNT) are relatively easy to synthesize and cheaper compared to either double-walled or single-walled carbon nanotubes. Hence they have been investigated for incorporation into BC. The electrical conductivity of BC-MWCNT composite depends on various factors such as 1) average length of MWCNT 2) their concentration in the precursor solution 3) type of surfactant used for dispersing the nanotubes and 4) immersion time for dispersing the nanotubes in the BC matrix. Yoon et al. [57] studied the effect of these variables on the overall electrical conductivity by using two surfactants. Cetyl trimethylammonium bromide (CTAB)... 

Figure 9.6 Two ways to grow the conventional CNTs by using CVD method (a) decomposition of the carbon-containing precursor on the surface of the catalyst particles (b and c) carbon species diffuse only on the surface of the catalyst particle following growth process (d and e) diffusion of carbon atoms through the particles as a solid solution and precipitation of carbon at the metal-support interface and the formation of a nanofiber or a nanotube. Adapted from Ref [36], Copyright 2011, Wiley.

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