Abstract
A standard procedure for thermogravimetric analysis (TG) of carbonaceous materials including single-walled carbon nanotubes was developed based on a statistical design to precisely study the effect of three main TG parameters: temperature ramp (TR, °C), initial mass (IM) of the sample (mg), and the rate of flowing gas (sccm) on the TG results. In addition, the effect of sampling including sample morphology and moisture content on TG were studied. The results of statistical design clearly showed that TG was affected by these three parameters and particularly by IM and TR. Interestingly, it was observed that the TG results are affected insufficiently by the sample morphology and low moisture content. This study also confirmed the potential of TG combined with high-resolution scanning electron microscopy to be a simple and straightforward method for purity evaluation of SWCNT-containing samples with a complex TG behavior such as those of induction thermal plasma grown. A complementary study on nano-metric catalysts indicated that these types of materials enable to gain or loss mass in an oxidative ambient during TG. A mass loss of 6% and a mass gain of 23% were observed for pure nano-metric yttrium oxide and nickel, respectively. A simple calculation showed a total mass gain of 1 wt% particularly by the catalysts in the SWCNT sample during TG.
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Acknowledgements
This study was partially supported by Le Fonds québécois de la recherche sur la nature et les technologies (FQRNT) and the Natural Sciences and Engineering Research Council (NSERC) of Canada. The author would like to thank Dr. Alireza Hekmat for proof reading of this article.
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Shahverdi, A., Soucy, G. Thermogravimetric analysis of single-walled carbon nanotubes synthesized by induction thermal plasma. J Therm Anal Calorim 110, 1079–1085 (2012). https://doi.org/10.1007/s10973-011-2114-4
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DOI: https://doi.org/10.1007/s10973-011-2114-4