Effect of plasma treatment on the gas sensor with single-walled carbon nanotube paste

► Plasma treated SWCNT shows different responses to that of pristine SWCNTs. ► NO2 and NH3 exposure depends on structural defects or functional groups present in SWCNT side wall. ► The Ar and O2 plasma-treated SWCNT pastes exhibited a large response to NO2 exposure. ► The CF4 and SF6, plasma-treated SWCNT pastes exhibited a large response to NH3 exposure.