Carbon nanotubes (CNTs) of ultrahigh purity and high crystallinity, which could be used for the encapsulation of nanoscaled materials, were fabricated by the heat treatment of disordered CNT-encapsulated In-Sn nanowires at temperatures lower than 1800 °C in H2 under vacuum conditions (pressure of approximately 1 Pa). The results showed that nearly 100% of the encapsulated In-Sn alloy was removed at 1800 °C, and as much as 99.99% of it at 1600 °C. The prepared CNTs were also filled with paraffin wax. A vacuum-based infiltration-purification process proved effective for fabricating the CNT-paraffin hybrid structures at a high filling yield, which was confirmed by thermograms and TEM observations.
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