Self-assembly of single walled carbon nanotubes onto cotton to make conductive yarn

► Poly(ethylene imine) treated cotton yarn is immersed in the single walled carbon nanotube (SWCNT) dispersion in Acid Red 91 solution to make SWCNTs self-assembled onto the yarn. ► The SWCNT functionalized yarn exhibits electrically conductive behaviour. ► The obtained yarn is used to make chemiresistor for detecting ammonia gas.