Environmentally Stable, Robust, Adhesive and Conductive Supramolecular Deep Eutectic Gels as Ultrasensitive Flexible Temperature Sensor.

It is essential and of great significance to impart the high mechanical performance, environmental stability, and high sensitivity to the emerging flexible temperature senors. In this work, we design and prepare polymerizable deep eutectic solvent by simply mixing N-cyanomethyl acrylamide (NCMA) containing an amide group and a cyano group in the same side chain with lithium bis(trifluoromethane) sulfonimide (LiTFSI), and obtain supramolecular deep eutectic polyNCMA/LiTFSI gels after polymerization. These supramolecular gels exhibit excellent mechanical performance (a tensile strength of 12.9 MPa and a fracture energy of 45.3 kJ m -2 ), strong adhesion force, high temperature responsiveness, self-healing ability, and shape memory behavior due to the reversible reconstruction ability of amide hydrogen bonds and cyano-cyano dipole-dipole interactions in the gel network. In addition, the gels also demonstrate good environmental stability and 3D printability. To verify its application potential as a flexible temperature sensor, the polyNCMA/LiTFSI gel-based wireless temperature monitor is developed and displays outstanding thermal sensitivity (8.4%/K) over a wide detection range. The preliminarily result also suggests the promising potential of PNCMA gel as a pressure sensor. This article is protected by copyright. All rights reserved.