SWCNT/PEDOT:PSS/DMSO aqueous inks for screen printing on paper substrates

抄録

Inks were prepared that were aqueous dispersions of single-wall carbon nanotubes (SWCNTs) for screen printing. Poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT:PSS) was used to improve the dispersion of the SWCNTs and dimethyl sulfoxide (DMSO) was added to adjust the viscosity for screen printing as well as to increase the conductivity of films produced from it by its secondary doping effect on PEDOT:PSS. By changing the DMSO-to-PEDOT:PSS volume ratio, ink viscosity suitable for screen printing was obtained. Films screen-printed on water-resistant paper substrates using the SWCNT/PEDOT:PSS/DMSO ink at a PEDOT:PSS-to-DMSO volume ratio of 100 : 75 had a low sheet resistance of 4.0±0.4 Ω/sq without any post-treatment, such as by acid treatment or high-temperature heating. Aqueous inks suitable for the screen printing of low-resistance films will be beneficial for various applications, including circuit boards and radio frequency identification, which require low-resistance and flexible conductive films supported on fragile substrates, such as paper.