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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. [ABSTRACT FROM AUTHOR]

Recently, poly(ionic liquid)s (PILs) have emerged as a family of polymeric materials which are being increasingly investigated for interdisciplinary applications. Their high electrical conductivity, excellent thermal/mechanical stability, low vapor pressure, and easy processibility render PILs exceptionally attractive as versatile platforms for green chemistry. Recent decades have witnessed fruitful efforts devoted to the development of PIL-based green chemistry platforms, achieving significant discoveries that will unfold their uniqueness in catalysis, separation, sensors, electrolyte, and functional materials. However, few review papers offer comprehensive discussion on PILs' application in the green chemistry field. In this review, we initially introduce the structure and types of PILs, which is followed by a systematical summary of the synthesis of PILs in terms of direct polymerization of monomer, polymerization after monomer modification, and modification of polymers. Furthermore, several aspects of the application of PILs related to green chemistry are highlighted, such as sensors, separation, catalysis, electrolytes for energy storage devices, and as versatile precursors yielding functional materials. Current challenges and corresponding research directions in PILs for green chemistry are clarified, to make PILs truly green platforms for existing technologies. [ABSTRACT FROM AUTHOR]

• Important roles of ionic liquids and deep eutectic solvents in green chemistry. • Overview on the efficiency of nanofluids in green chemistry. • Cutting-edge methodologies for sustainable synthesis of organic materials. • Mechanism of action in ionic liquids and deep eutectic solvents. Form past till now, green chemistry has been considered as a promising technique for the organic synthesis of materials toward environmental sustainability and economic development. The prominent duties of green chemistry are the enhancement of production efficacy and decrement of waste generation during the operation. In order to implement this process in industries, important green strategies like avoiding waste production, application of catalytic amount of catalyst, reduction of energy consumption and eventually, employment of renewable /bio-degradable substances must be paid attention. The industrial-based application of ionic liquids, deep eutectic solvents and nanofluids have recently been of great interest as eco-friendly, bio-degradable and green materials, which significantly improve the efficiency of green synthesis of organic materials. This paper aims to comprehensively review the breakthrough and cutting-edge methodologies for sustainable and green synthesis of organic materials. Then after, the advantages, performance and the mechanism of action for each technique are explained and the environmental challenges toward their efficient industrial application are discussed in detail. [ABSTRACT FROM AUTHOR]