We have succeeded in fabricating a highly robust, adhesive, gas-permeable free-standing polymeric nanofilm with a thickness of less than 100 nm. A gas-permeable dry electrode comprising of a nanofilm and an Au layer can adhere to the human skin by van der Waals forces alone for 1 wk for high-fidelity electrocardiogram recording. Our method has overcome the major bottleneck in continuously ....