SUPPLEMENTARY INFORMATION
Thermogravimetric analysis:
The thermogravimetric analysis of our MWCNT was carried out in a Perkin
Elmer Thermogravimetric Analyzer Pyris 1 TGA. About 40-50 % of the
volume of the platinum pan was filled with MWCNTs. The sample was then
heated from 30°C up to 800°C at a heating rate of 20°C/min in an air
atmosphere using an air flow rate of 20 ml/min. The final goal of this
analysis was to determine the ash content of each sample. The following
thermograms (Fig. S1) confirm that ~4.8 wt% of catalyst was present in the
sample.
Elemental Analysis:
In order to confirm the catalyst composition, we obtained energy dispersive
X-ray spectra of our samples on Hitachi S-4800 scanning electron
microscope. The results reveal a Fe Ka line ~ 6.40 eV confirming the
presence of Fe catalyst particles in our sample (See Fig. S2).
Fig S1: The thermogram for MWCNT used in this study reveals that the catalyst amounts to ~4.8
wt% of the sample
Fe
Fig. S2: The top panel shows the region of the sample used for obtaining the energy dispersive
X-ray spectra. The bottom panel shows the presence of C (from MWCNTs and the SEM tape)
along with the presence of Fe catalyst.