Ever thought of electronics that can stretch like a rubber-band? Rarely is it possible to find electronic materials that can stretch, but if found, they could make sci-fi fantasies into reality. Skin tattoos that can replace your mobile devices, display screens that can be folded into your pocket, suits that can serve your computational needs all become possible through finding the right stretchable electronic material. But rather than creating such a material from scratch, it would be easier and more economical to convert an existing stretchable material into one that can stretch even more and also conduct electricity.
Here we propose a new concept for realizing greatly enhanced stretchability beyond intrinsic limit of materials by structuring the materials in the form of 3D nanonetworks. The nanostructured material, poly(dimethylsiloxane) (PDMS), improves its stretchability up to 62% compared to bulk, solid PDMS. By infiltrating liquid metal into the 3D continuous network of periodic pores, the liquid metal and PDMS composite yields extremely high electrical conductivity (~24,100 S·cm-1) even at the strains of >220%. Simple demonstration of LED arrays with the stretchable electrode proves the performance under extreme strains. Overall fabrication processes and stretching mechanism will be presented in this talk.