“…Metal films on PDMS, however, can sustain only limited stretching, and the stable and durable deposition of metal onto PDMS surfaces poses a great challenge. Several ingenious solutions to this problem have been described, including an accordionlike structure 18,19 , a meandering-shaped thin metal conductor on the PDMS surface 3,12,17,[19][20][21] , bonding of two-dimensional stretchable Si nanomembranes onto elastomeric PDMS slabs, or printing of elastic conductors comprising single-walled nanotubes on elastic substrates [22][23][24] . Although these technologies have contributed greatly to the development of flexible electronics, each of them still has their limits (for example, complicated fabrication processes, and direct bonding of commercialized components on highly stretching substrates).…”