| With the advent of the era of intelligence,miniaturized and integrated wearable flexible electronics play an important role.In particular,the flexible stress sensor can convert mechanical deformation and pressure into electrical signals,while it is widely used in the fields of human motion detection,human-machine interaction,and Internet of Things because of its advantages of thinness,bendability and twistability,and common irregular surface.However,the existing flexible stress sensors suffer from poor flexibility,low sensitivity and complicated preparation process,which seriously hinder their application in real life.In addition,common flexible stress sensors require external battery power supply,which cannot meet their needs for long-time operation,so the sustainable power supply of flexible stress sensors needs to be solved urgently.To address the above problems,this paper proposed a hybrid piezoelectric effect-based flexible stress sensor(HPFS),and based on this sensor,a self-driven smart glove that can complete the interaction of multiple electronic devices.The specific studies are as follows.(1)The flexible stress sensor based on the composite piezoelectric effect was prepared by using the high stretchability Ecoflex material as the matrix,and the composite piezoelectric material was evenly dispersed in the flexible matrix by simple mechanical stirring and coating process.The sensor can be easily bent,twisted and squeezed,and the preparation method is simple,which solves the current problems of poor skin commonality and complicated preparation process of flexible stress sensors.(2)A new piezoelectric material polyacrylonitrile(PAN)was used and composite with zinc oxide(ZnO)to investigate the mechanism of piezoelectric performance enhancement after the composite.Due to the synergistic piezoelectric effect of ZnO and PAN,the output voltage and current of the flexible stress sensor based on ZnO/PAN/Ecofelx composite film are increased by 140% and 100%,respectively,compared with the pure ZnO/Ecoflex composite film,further enhancing the self-driving capability of the sensor and circumventing the constraint that the external power supply of the sensor cannot continuously supply energy.In addition,the prepared flexible stress sensor also has excellent sensitivity(42 m V/k Pa),good linearity(0.98),fast responsiveness(54 ms)and high stability(no decay at 16,000 cycles)under cyclic pressure force,which can be used for real-time monitoring of human posture.(3)Based on the excellent electrical properties,flexibility,and self-driven characteristics of this flexible stress sensor,a self-driven smart glove is proposed.The glove can flexibly respond to human hand movements,and the corresponding human-machine interaction system is designed to complete the acquisition,processing and control command transmission of the smart glove signal.After wearing the self-driven smart gloves,human can use the gesture of switching remote control a variety of electronic devices,the smart glove has been successfully applied to smart car two-dimensional movement,light bulb brightness and switch control,fan switch control.In this study,a flexible stress sensor based on ZnO/PAN/Ecoflex composite film was prepared using mechanical stirring and coating process,which solved the current problems of poor flexibility and low sensitivity of flexible sensors and complicated preparation process,and improved the electrical performance of flexible stress sensors.Moreover,we prepared a selfdriven smart glove based on this sensor,built a corresponding human-machine interaction system,and completed the interaction control of various electronic devices.The system has the advantages of simple operation,easy portability and low power consumption,which is expected to bring new application prospects for the field of human-machine interaction. |
