Abstract
Impurities in carbon nanotube (CNT) films can introduce unpredictable deleterious effects in carbon-based electronic devices and composites. To purify CNT films, a key obstacle is the removal of impurities without damaging the structure of CNTs. Herein, we present an efficient, rapid, energy-saving, and eco-friendly incandescent annealing purification (IAP) to prepare ultrahigh-purity and high-quality CNT films. The results showed that Fe-containing impurities in CNT films were reduced from 9.48 wt% to less than 0.05 wt%, the ratio between Raman D and G peak intensities decreased from 0.52 to 0.44, and the XPS C/O ratio enhanced from 19.16 to 70.71. The purification efficiency is up to 99.47%, much higher than the conventional electro-oxidation (E-Oxi) purification (71.20%). The IAP-treated CNT and its composite film exhibited excellent advantages in mechanical performance, ablation resistance, and stable electro-heating. Furthermore, the rapid IAP within just a few seconds also leads to the orders of magnitude reduction in energy cost, making it super practical.
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