Development of air-stable n-type single-walled carbon nanotubes by doping with 2-(2-methoxyphenyl)-1,3-dimethyl-2,3-dihydro-1H-benzo[d]imidazole and their thermoelectric properties

•Air-stable n-type single-walled carbon nanotube (SWCNT) was developed.•Benzimidazole derivative acted as a stable dopant.•Formation of stable cation of dopant was found as a key for the air stability.

N-type single-walled carbon nanotubes fabricated by doping of organic dopant, 2-(2-methoxyphenyl)-1,3-dimethyl-2,3-dihydro-1H-benzo[d]imidazole, shows remarkable air-stability for over 90 days under atmospheric environment. Formation of stable complex between cationic dopant and anionic SWCNT is considered as the key to prevent the air oxidation.

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