Ultrathin breathable and stretchable electronics based on patterned nanofiber composite network

Wearable comfort and performance modulation of stretchable electronics are the focus of next-generation electronic skin. Herein, we developed ultrathin breathable and stretchable electronics by introducing elaborate patterned electrospinning technology. The principle of patterned electrospinning technology is studied, and this technology is proved to be universal for variety of polymers experimentally. The effect of electrospinning time and patterned pore size on the performance of patterned electrospun film is studied. Using an ultrathin patterned stretchable thermoplastic polyurethane electrospun film (10 μm) as a supportive layer, a patterned nanofiber composite network is constructed, combined with Ag nanowires and thermoplastic polyurethane/Ag nanofibers. The patterned nanofiber composite network is achieved with outstanding stretchability and conductivity, while the mean sheet resistance is as low as 1.59 Ω/sq and can be stretched to 110% strain. The electromechanical performance of nanofiber composite network is controlled by the pore size of patterned electrospun film, which can be applied for stable, breathable, and stretchable electrode and strain sensor. Hence, the elaborate patterned electrospinning technology and the fabrication and modulation of patterned nanofiber composite network offer a method for stretchable electronics.