The International Organization for Standardization (ISO) has published standard ISO/TS 11308:2020, “Nanotechnologies — Characterization of carbon nanotube samples using thermogravimetric analysis.” The standard provides guidelines for the characterization of carbon nanotube (CNT)-containing samples by thermogravimetric analysis (TGA), performed in either an inert or oxidizing environment. The standard offers guidance on the purity assessment of the CNT samples through a quantitative measure of the types of carbon species present, as well as the non-carbon impurities (e.g., metal catalyst particles) within the material. ISO notes that this technique provides a qualitative assessment of the thermal stability and homogeneity of the CNT-containing sample. ISO states that additional characterization techniques are required to confirm the presence of specific types of CNT and to verify the composition of the metallic impurities present.
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