Versatile imperceptible on-skin devices

On-skin devices that provide performance and comfort without interfering with the normal sense of touch are essential for the long-term deployment of on-skin technologies, but are challenging to realize. Yi Shi, Lijia Pan and colleagues fabricated 3D microstructure arrays that are ultrathin, ultralight and gas-permeable, and used them to realize a range of imperceptible on-skin devices. The arrays are fabricated using electrospinning self-assembly, a flexible design strategy that enables the optimization of the optical, thermal, mechanical and electrical properties for different applications. The arrays were used to fabricate a daytime radiative cooling device that induces a 4 °C temperature drop, a pressure sensor able to detect a very weak fingertip pulse for health diagnosis and monitor finger movements, and a nanogenerator for reliable biomechanical energy harvesting. Using a broader range of materials can enable further applications, and optimizing the structure of the arrays can boost device performance.

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