Disclosed are conductive polymer inks and methods for forming the inks. The disclosed inks include a dispersion of conductive core/shell nanoparticles. The core/shell nanoparticles include a polymeric core and a shell formed of a conducting polymer. The inks can include a dispersion of the core/shell nanoparticles in a liquid carrier, such as an alcohol. The disclosed inks can be formulated to high viscosities and can be utilized in high-speed printing processes including rotogravure and flexographic printing processes. Products encompassed by the disclosure include polymer devices such as sensors, OFETs, RFID tags, printed circuit board, electrochromic devices, non-volatile memory devices, photovoltaics, and the like.