Nanodroplets for Stretchable Superconducting Circuits

The prospective utilization of nanoscale superconductors as micro/nanocoils or circuits with superior current density and no electrical resistance loss in next‐generation electronics or electromagnetic equipment represents a fascinating opportunity for new microsystem technologies. Here, a family of superconducting liquid metals (Ga–In–Sn alloys) and their nanodroplets toward printable and stretchable superconducting micro/nanoelectronics is developed. By tuning the composition of liquid metals the highest superconducting critical temperature (Tc) in this family can be modulated and achieved as high as 6.6 K. The liquid metal nanodroplets retain their bulk superconducting properties and can be easily dispersed in different solvents as inks. The printable and stretchable superconducting micro/nano coils, circuits and electrodes have been fabricated by inkjet printer or laser etching by using superconducting nanodroplets inks. This novel superconducting system greatly promotes the commercial utilization of superconductors into advanced flexible micro/nanoelectronic devices and offers a new platform for developing more application with superconductors. Superconducting eutectic gallium–indium–tin (EGaInSn) alloys and their nanosized droplets with different weight ratios are developed for realizing printable and stretchable superconducting circuits. The highest superconducting critical temperature of EGaInSn is 6.6 K. The corresponding EGaInSn nanodroplets retain the bulk superconducting properties. Their dispersion in various solvents shows excellent wettability, which can be easily applied to print stretchable superconductive micro/nanoelectronics.