Electronically modified single wall carbon nanohorns with iodine adsorption

► The modification of electronic properties of SWCNH was verified by the enhancement of electrical conductivity of SWCNH with iodine adsorption. ► The presence of I 3d peak at around 620 eV guarantees the iodine adsorption on SWCNH. ► Iodine adsorption significantly reduces surface area and nanoporosity of SWCNH.