Ultrathin, Breathable, Permeable, and Skin‐Adhesive Charge Storage Electronic Tattoos Based on Biopolymer Nanofibers and Carbon Nanotubes

Abstract Ultrathin, breathable, and skin‐compatible epidermal electronics are attractive for wearable implantable healthcare biomedical applications. However, materializing integrating all electronic components on ultrathin platforms is still challenging. Here, a charge‐storing tattoo (E‐tattoo) device with ultrathin, properties reported. Silk protein nanofibers (SNFs) carbon nanotubes (CNTs) form the top bottom electrodes that sandwich intermediate dielectric layer fabricated using poly(vinyl alcohol) nanofibers. The E‐tattoo capacitors deformed skin, show excellent mechanical electrical stability, 60 µm‐thick exhibit frequency‐dependent capacitances (up to 350 pF at 5 kHz) capability memory operation. Mechanical bending induces capacitance change, which increases as radius decreased, indicating sensing of E‐tattoo. SNF/CNT‐based triboelectric nanogenerator E‐tattoos can be connected capacitor E‐tattoo, charges generated by multiple bare‐finger touches stored in (0.23 V 200 touches). Due micro/nanopores NF networks, exhibits water vapor transmission rate 115.04 g m −2 d −1 , better than commercial band‐aid, well ethanol capability. Developed used constructing multicomponent integrated electronics.