Highly conductive, printable ink for highly stretchable soft electronics

A highly conductive and printable ink, comprising:

• (i) 5 to 40 vol % of conductive hydrophobic silver particles, with respect to the total volume of ink, as conductive solid phase,
• (ii) a liquid primary phase comprising, as a polymer base, a cross-linkable hydrophobic polydimethylsiloxane (PDMS) which is capable to become an elastomer by cross-linking, and further including a cross-linker in an amount of 1 to 10 vol % and a catalyst solution in an amount of 0.01 to 5 vol %, with respect to the PDMS base, and
• (iii) a liquid secondary phase based on an ionic liquid, with a volume ratio ρ of 0.01 to 0.2 between liquid secondary phase and conductive solid phase,
• wherein the liquid secondary phase is immiscible with the liquid primary phase and does not wet the conductive solid phase, so that the three-phase system creates a capillary suspension.