Electrical Characterization of Stretchable Printed Liquid Metal Interconnects under Repeated Cyclic Loading

Stretchable electronic devices require interconnects that are able to elastically deform to high levels of strain [1] . Such stretchable interconnects require new conductor geometries for metallic traces [2] or inherently-stretchable materials, such as liquid metals [3] , [4] . The long-term reliability of liquid metal interconnects over thousands of cycles of deformation and relaxation remains an open question. Here, we present measured strain cycle and resistance data for four samples of 3D-printed interconnects made using a liquid metal paste material to assess long-term changes in electrical properties over 10,000 cycles of 50% and 100% strain. The samples show less than 1% change in nominal resistance over thousands of cycles with less than 1% hysteresis.