SWCNT/PEDOT:PSS/DMSO Aqueous Inks for Screen-Printing on Paper Substrates

抄録

We have prepared an aqueous dispersion ink of single-walled carbon nanotube (SWCNT) for screen-printing. In this preparation, poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT:PSS) was utilized to improve the dispersion of SWCNT in an aqueous solution, and dimethyl sulfoxide (DMSO) was added to the SWCNT/PEDOT:PSS inks to improve the ink dispersion and adjust the ink viscosity for screen-printing, as well as increasing the film conductivity by a secondary doping effect to PEDOT:PSS. By optimizing the volume ratio of the DMSO addition to PEDOT:PSS, suitable ink viscosities for screen-printing were obtained. The films fabricated on water-resistant paper substrates by screen-printing using the SWCNT/PEDOT:PSS/DMSO ink with a DMSO addition ratio of 75% showed a low sheet resistance of 4.0 ± 0.4 Ω/sq without any post-treatment such as high-temperature heating or acid treatment. Aqueous inks for screen-printing of low-resistance films will be useful for various applications such as microwave and circuit devices, which require low-resistance and flexible conductive films on chemically fragile substrates like papers.