Photopatternable and self-healable ionogels for organic thin-film transistors

초록

We demonstrate photocrosslinkable solid polymer ionogel electrolytes using thiol-containing 4-arm poly (ethylene glycol) (4-arm PEG-SH) and a dimethacrylate crosslinker containing a disulfide bond through a radicalbased thiol-ene click reaction. The thiol-ene click reaction between the alkene and thiol in the dimethacrylate crosslinker and PEG polymer, respectively, with a conventional photoradical generator was successful for effective photocrosslinking in different ionic liquids. The resulting ionogels exhibited decent optical transparency, ionic conductivity, stretchability, and patternability in a photolithographic manner. Moreover, the disulfide bonds present in the ionogels enabled self-healing of the ionogels under mild conditions of 60 degrees C for 3 min, indicating an efficient dynamic disulfide metathesis in the ionogels. Finally, to highlight the applicability and processability of the current material design platform, ionogel photopatterns were fabricated on a poly(3hexylthiophene-2,5-diyl) thin-film surface and utilized as a high-capacitance gate dielectric in thin-film transistors. This further demonstrates the potential of these ionogels in practical electronic and electrochemical applications.

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