High-performance Electronic Skin Based On MXene And Its Composite Material

Electronic skin is an ideal choice for emerging technologies and bio integrated devices due to its superior properties such as portability,foldability,biocompatibility,and mechanical stability.It has unlimited potential in a wide range of application fields,such as next-generation prosthetics,soft robots,human-machine interfaces,and personalized healthcare systems.An ideal electronic skin system should accurately simulate the characteristics of natural skin in real time（such as self-healing,ability to identify and evaluate various external stimuli and physiological signals）,enabling individuals to interact and communicate with the surrounding environment,and perform complex tasks according to instructions.At present,various electronic skins have been developed based on different materials and principles to distinguish external stimuli.These electronic skins have high sensitivity,short response time,and good stability,but they are still difficult to achieve practical applications for implantation in vivo and clinical medicine.At the same time,the vigorous development of electronic devices has to some extent caused pollution from electronic waste.Therefore,developing an electronic skin with high sensitivity,stable performance,biocompatibility,no fear of damage,and the ability to be reused multiple times has important theoretical and practical significance.Based on the research results of domestic and foreign scholars,this article designed and prepared an electronic skin based on Ti₃C₂ MXene film.Dynamic pressure sensitive testing has shown that the film has good piezoresistive properties.On the basis of this plan,optimization and improvement have been made in terms of enhancing sensitivity,developing biocompatibility,and self-healing.In response to sensitivity and biocompatibility issues,a highly sensitive and biocompatible MXene/WMP film was designed using the three-dimensional porous structure of natural biomaterials,and a flexible electronic skin was prepared.The sensitivity of the device was increased by 4.4 times compared to Ti₃C₂ MXene film,and it is non-toxic and harmless,without causing additional damage to the human body.It can accurately distinguish behavioral activities such as pulse,joint activity,and speech recognition.In order to solve the problem of environmental pollution caused by electronic skin,we introduce polymers that can heal,in order to achieve the goal of restoring their original state and continuing to play their original functions even after damage.In this study,MXene/PAA composite hydrogel was successfully prepared,which not only has a wide detection range,but also can accurately identify external stimuli.We attach it directly to the body and demonstrate behavioral recognition of large movements as well as small movements such as facial expressions.In addition,the hydrogel can heal spontaneously after being damaged without much degradation of sensing performance,and can also complete degradation in hydrogen peroxide solution,which greatly reduces the environmental pollution of electronic devices.