Bioinspired Gradient Stretchable Aerogels for Ultrabroad‐Range‐Response Pressure‐Sensitive Wearable Electronics and High‐Efficient Separators

Abstract

Broad-range-response pressure-sensitive wearable electronics are urgently needed but their preparation remains a challenge. Herein, we report unprecedented bioinspired wearable electronics based on stretchable and superelastic reduced graphene oxide/ polyurethane nanocomposite aerogels with gradient porous structures by a sol-gel/hot pressing/freeze casting/ambient pressure drying strategy. The gradient structure with a hot-pressed layer promotes strain transfer and resistance variation under high pressures, leading to an ultrabroad detection range of 1 Pa-12.6 MPa, one of the broadest ranges ever reported. They can withstand 10 000 compression cycles under 1 MPa, which can't be achieved by traditional flexible pressure sensors. They can be applied for broad-rangeresponse electronic skins and monitoring various physical signals/motions and ultrahigh pressures of automobile tires. Moreover, the gradient aerogels can be used as high-efficient gradient separators for water purification.

Super-stretchable and negative-Poisson-ratio meta-aerogels

“…These investigations con rmed the successful incorporation of rGO and PPy in the rGO/polymer aerogels. [20,22,37,38] Detailed analyses on chemical structures are shown in supplementary information.…”

“…[21] Besides, we have reported stretchable (~ 100% elongation at break) rGO/PU aerogels with a gradient porous structure for high-performance pressure-sensitive wearable electronics. [22] Special porous microstructures such as lamellar and honeycomb-like structures may effectively reduce stress concentration and contribute to stress transfer, which may make the resultant aerogels stretchable.…”

Performance Optimization of Ionic Polymer Sensors through Characteristic Regulation of Chemically Prepared Interfacial Electrodes

“…At present, the electrode preparation of the IPS can be divided into physical methods and chemical methods. The physical methods mainly include sputtering, hot pressing, deposition, and so on, − while the chemical methods mainly include dip-reduction plating and electroplating. , …”