Stretchable and self-healable double-network ionogel with strong adhesion and temperature tolerance for information encryption

Fluorescent double network ionogels with fast self-healability and high resilience for reliable human motion detection

“…As a result, hydrogel-based flexible sensors have the problems of a narrow applied temperature range and easy loss of solvent. Ionogels are constituted by a network blocking large amounts of ionic liquids (ILs) into it, 8,14,15 which are suitable substitutes for hydrogels to avoid poor sensing performance at extreme temperatures. 16,17 Ma et al designed a new ionogel with great sensing performance in the temperature range of À40 to 80 1C to achieve real-time monitoring of human motions.…”

“…Ionogels are solid-like soft materials in which ILs are immobilized in a three-dimensional network. 14 Different strategies have been reported to construct ionogel networks by the selfassembly of small molecules or macromolecules, and/or covalent cross-linking of polymers. [20][21][22] Recently, self-healing ionogels, which can repair damage and maintain long-lasting functions, have attracted a great deal of interest.…”

“…As illustrated in Fig. 3d, the structures could be held together by the dangling hydrogen bonds exposed on the cutting surfaces, and the reconstructed imine bonds through a Schiff base reaction 14,44 between the amino groups of AG-NH 2 and the aldehyde groups of BTC. The dynamic nature was demonstrated by FT-IR spectra (Fig.…”

“…The low T g values indicate the strong resistance of ionogels to low temperatures. 14,49 Besides, a low glass transition temperature is beneficial for the mobility of molecular chains because of the easy acquisition of free volume, which further favours the formation of a ''mobile phase'' during the autonomous self-healing process.…”

“…Meanwhile, G 0 4 G 00 in the whole sweeping frequency range reveals that the elasticity instead of viscosity is dominated for ionogels, which is consistent with the previous work. 14 High performance strain sensors require excellent mechanical properties to avoid damage from external forces during the monitoring process and fit well to the skin. Mechanical properties of the ionogel were further measured by tensile and compression tests via the universal testing machine.…”