Conductive polymers like poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS)are key materials in bioelectronics,but balancing ultrahigh conductivity with long-term tissue contact stability remains a chal...Conductive polymers like poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS)are key materials in bioelectronics,but balancing ultrahigh conductivity with long-term tissue contact stability remains a challenge.Here,we present a solvent-mediated solid-liquid interface doping strategy to engineer vertically phase-separated(VPS)PEDOT:PSS films.By adjusting thickness and doping solvents,a thicker PEDOT:PSS film with a strong VPS structure was achieved,featuring a higher PSS/PEDOT ratio on the surface and a lower ratio at the bottom.Doping the pristine film with a metastable liquid-liquid contact solution enables gradual PSS migration and a significant component gradient,yielding films with a hydrophilic surface and one of the highest reported conductivities(~8800 S cm^(-1))for bioelectronic devices.The films patterned by laser processing present high-fidelity signal acquisition,and excellent electrochemical stability.With low impedance and long-term biocompatibility,they are employed for real-time wearable and implantable sensors for electrophysiological monitoring,showcasing broad potentials in bioelectronics and human-machine interactions.展开更多
基金support of the Shanghai Synchrotron Radiation Facility for their crucial contributions to this study.This research received funding from National Natural Science Foundation of China(No.52173024,No.51973183 and No.52475610)Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering(No.2022SZTD008)the Zhejiang Provincial Natural Science Foundation of China(LDQ24E050001)。
文摘Conductive polymers like poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS)are key materials in bioelectronics,but balancing ultrahigh conductivity with long-term tissue contact stability remains a challenge.Here,we present a solvent-mediated solid-liquid interface doping strategy to engineer vertically phase-separated(VPS)PEDOT:PSS films.By adjusting thickness and doping solvents,a thicker PEDOT:PSS film with a strong VPS structure was achieved,featuring a higher PSS/PEDOT ratio on the surface and a lower ratio at the bottom.Doping the pristine film with a metastable liquid-liquid contact solution enables gradual PSS migration and a significant component gradient,yielding films with a hydrophilic surface and one of the highest reported conductivities(~8800 S cm^(-1))for bioelectronic devices.The films patterned by laser processing present high-fidelity signal acquisition,and excellent electrochemical stability.With low impedance and long-term biocompatibility,they are employed for real-time wearable and implantable sensors for electrophysiological monitoring,showcasing broad potentials in bioelectronics and human-machine interactions.
