Mechanically robust PEDOT:PSS hydrogel via mild liquid metal crosslinking

') of up to 2500 Pa. Microscopic characterization reveals a transition from a porous structure to a more compact, flake-like morphology, which contributes to the improved mechanical stability. Ga crosslinking leads to a reduction in electrical conductivity, reflecting the altered polymer interactions associated with ionic crosslink formation. The combination of mechanical enhancement and preserved ionic-electronic mixed conduction suggests that these hydrogels hold promise for organic electrochemical transistor (OECT) applications, where reduced initial conductivity can be advantageous for device operation.