Recent Application of Cellulose Gel in Flexible Sensing-A Review

Abstract

There is a huge and growing demand for flexible electronics for electronic skin, wearable devices and medical equipment. At the same time, celluloses with the special crystal shape, surface structure, good biocompatibility and easy degradability is frequently used as a substrate or modified substance for flexible electronic equipment.Therefore, the use of cellulose as a raw material is expected to contribute to environmental protection and help to overcome problems such as biocompatibility and stretchability required by flexible sensing devices. The goal of this review is to provide an overview on the latest developments in cellulose gel-based flexible sensors, especially focusing on the detailed descriptions of the major three applications in electronic skin, sports equipment and medical equipment, as well as the relationship between the structure and properties of the cellulose gel material. Finally, an outlook of the challenges and future possibilities for development of flexible sensing equipment based on cellulose gel material is presented.

Ionic Flexible Sensors: Mechanisms, Materials, Structures, and Applications

“…[95] Among these, cellulose with the special crystal shape, surface structure is one of the oldest biodegradable materials, which is frequently used as a matrix or modified matrix for flexible electronic equipment. [96][97][98] Meanwhile, it has been used as biodegradable matrices in many studies owing to its low cost, easy degradability and environmental friendliness. [99,100] Zhang et al used nano-cellulose-derived hierarchical porous carbon as the ionic polymer matrix to prepare supercapacitive interfacial IFS with excellent electrochemical performance.…”

Cellulose: a fascinating biopolymer for hydrogel synthesis

“…Conductive hydrogels used for wearable sensors resemble natural biological tissues and demonstrate good biocompatibility compared to traditional sensors made of flexible metal circuits and conductive elastomers. 205,206 The distinct self-healing properties of hydrogels in wearable devices permit them to regain their structural stability and functionality after damage. Such transformation and changes in the structure and functionality of hydrogels result from their response to external stimuli; hence, they are referred to as smart materials.…”

High performance microwave absorption of light weight and porous non-carbon-based polymeric monoliths via a gel emulsion template

“…[46][47][48][49][50][51] There are many applications for the gel method to prepare other materials. [52][53][54][55] Moreover, the dispersed phase of gel emulsions is usually water rather than organic solvents, which is more environmentally friendly and reduces the cost. Thus, we chose gel emulsions as templates to construct the porous structures of MA materials.…”