METHOD OF PRODUCING IODINE-DOPED CARBON NANOTUBES Russian patent published in 2019 - IPC C01B32/00 B82B3/00 

FIELD: chemistry.

SUBSTANCE: method of producing carbon-nanotubes doped with iodine is carried out by sublimation deposition of iodine on the surface of carbon nanotubes, pre-treated with concentrated sulphuric acid under ultrasound for 10–30 minutes with molar ratio of carbon to sulphuric acid equal to 1:6–8. Treated CNTs are then held in concentrated sulphuric acid for 5–10 hours and then distillate water is added to the reaction mixture and carbon nanotubes are separated by vacuum filtration. Subsequent cleaning of the CNT surface from sulphuric acid is carried out as follows: carbon nanotubes are poured with distilled water and mixed therein until a suspension is formed, carbon nanotubes are extracted from the suspension by centrifugation, they are washed with stirring with distilled water until pH 5–6 of the aqueous solution to be drained is obtained and the washed carbon nanotubes are dried at 90–120 °C. After that, dried oxidised nanotubes are mixed with crystalline iodine at weight ratio of carbon nanotubes to iodine equal to 1–4:1, reaction mixture is held at temperature 114–115 °C for 5–15 hours, iodine is removed by vacuum and the end product is separated. Method of atomic emission spectrometry with inductively coupled plasma was used to determine concentration of iodine equal to 8.3–19.6 wt. %.

EFFECT: present invention relates to methods of producing doped carbon nanotubes, particularly dinitrogen-doped nanotubes used as fillers in producing polyimides and composites used in microelectronics.

3 cl, 4 ex