Highly Tough, Stretchable, and Recyclable Ionogels with Crosslink-Enhanced Emission Characteristics for Anti-Counterfeiting and Motion Detection

Abstract

Traditional luminescent ionogels often suffer from poor mechanical properties and a lack of recyclability and regeneration, which limits their further application and sustainable development. Herein, a luminescent ionogel with strong mechanical properties and good recyclability has been designed and fabricated by introducing dynamic coordination bonds via in situ one-step crosslinking of acrylic acid in ionic liquid of 1-ethyl-3methylimidazolium diethylphosphate by zinc dimethacrylate. Due to the special crosslinking of dynamic coordination bonds along with the hydrogen bond interaction, the as-prepared ionogel displays excellent stretchability and toughness, good self-adhesiveness, fast self-healability, and recyclability. Interestingly, the obtained ionogels exhibit tunable photoluminescence caused by the crosslink-enhanced emission (CEE) effect from the coordination bonds. Importantly, ionogels can be applied in information storage, information encryption, anti-counterfeiting due to their simple and in situ preparation method, and their special fluorescence performances. Moreover, an ionogel-based wearable sensor has rapid response time and a high gauge factor of 3.22 within a wide strain range from 1 to 700%, which can monitor various human movements accurately from subtle to large-scale motions. This paper offers a promising way to fabricate sustainable functional ionic liquid-based composites with CEE characteristics via an in situ onestep polymerization method.

Skin‐Inspired, Highly Sensitive, Broad‐Range‐Response and Ultra‐Strong Gradient Ionogels Prepared by Electron Beam Irradiation

“…[34] The characteristic is exceptionally uncommon among the existing reported ionic skin materials. [26,53,55,[66][67][68] In short, the gradient ionogel not only closely resembles but even surpasses human skin in terms of response speed, sensing ability, and detection limit, which greatly enhances its potential as pressure sensors in various applications.…”

Strong and Ultratough Ionogel Enabled by Ingenious Combined Ionic Liquids Induced Microphase Separation

“…The preparation of ionogels mainly includes chemical crosslinking [20,21] and physical crosslinking, [22,23] which imparts the ionogels with different properties, such as mechanical properties, self-healing capability, and adhesive capacity. [13,24] The chemical-crosslink ionogel usually exhibits satisfactory fracture strength and elasticity, owing to the stretchable covalent bond between crosslinker and the polymers.…”