Recent Advances in Transparent Materials Based on Ionic Liquids and Their Applications in Sensors

Since the 21st century, transparent flexible sensors (TFSs) have been widely employed in abundant fields, such as smart glasses, intelligent watches, robots, electronic skin, especially biomedicine. Presently, various materials have been developed, such as metal-based, carbon-based, conductive polymer-based, and ionic liquid-based (IL-based) materials. Compared with the first three materials, IL, as a novel material, with the tendency of green chemistry development, has a high application prospect in TFSs. Based on this, this paper mainly discusses recent advances in TFSs based on ILs, with special emphasis on the role of ILs and the factors influencing transparency as well as electricity. The current challenges and opportunities for each type of sensors based on IL are also studied. This paper mainly introduces the manufacturing process, performance, working principle of TFSs in line with the form of ILs, namely gel, filler, solvent, poly (ionic liquid) and deep eutectic solvent. Furthermore, several factors regulating transparency and electricity are generally summarized. Finally, the applications in the wearable field are summed up. image