Aramid Nanodielectrics for Ultraconformal Transparent Electronic Skins

Abstract

On‐skin electronics require minimal thicknesses and decent transparency for conformal contact, imperceptible wearing, and visual aesthetics. It is challenging to search for advanced ultrathin dielectrics capable of supporting the active components while maintaining bending softness, easy handling, and wafer‐scale processability. Here, self‐delaminated aramid nanodielectrics (ANDs) are demonstrated, enabling any skin‐like electronics easily exfoliated from the processing substrates after complicated nanofabrication. In addition, ANDs are mechanically strong, chemically and thermally stable, transparent and breathable, therefore are ideal substrates for soft electronics. As demonstrations, compliant epidermal electrodes comprising silver nanowires and ANDs can successfully record high‐quality electromyogram signals with low motion artifacts and satisfying sweat and water resistance. Furthermore, ANDs can serve as both substrates and dielectrics in single‐walled carbon nanotube field‐effect transistors (FETs) with a merely 160‐nm thickness, which can be operated within 4 V with on/off ratios of 1.4 ± 0.5 × 105, mobilities of 39.9 ± 2.2 cm2 V−1 s−1, and negligible hysteresis. The ultraconformal FETs can function properly when wrapped around human hair without any degradation in performance.This article is protected by copyright. All rights reserved

Ultraconformable Integrated Wireless Charging Micro-Supercapacitor Skin

“…Our previous work [ 11 ] combined wireless charging coil and micro-supercapacitor together by using graphite/activated carbon materials. Although most of the previous reports are devoted to build integrated structural and material wireless charging devices, it is still a challenge to build a satisfying skin-conformable integrated wireless charging micro-supercapacitor, which is skin-like to accommodate the local details of the target uneven surface as well as aesthetics [ 12 ]. The main reason is that the constructing materials are only flexible within limited area or angles, presenting flexural rigidity to some extent.…”