Wearable piezoresistive sensors play a crucial role in smart healthcare,motion tracking,and human-computer interaction,yet conventional materials often suffer from limitations such as low sensitivity,poor flexibility,...Wearable piezoresistive sensors play a crucial role in smart healthcare,motion tracking,and human-computer interaction,yet conventional materials often suffer from limitations such as low sensitivity,poor flexibility,and insufficient durability.To address these challenges,this study presented anisotropic porous composite aerogels(A_(30)-C_(5)S_(5))fabricated through directional freeze-drying,incorporating silver nanowires(AgNWs)as a conductive network in combination with sodium alginate(SA)and carboxylate cellulose nanofiber(CNF-C)at an optimized ratio.The aerogel exhibited distinctive structural features:honeycomb-like dense pores in the XZ plane and a channel-type porous architecture in the XY plane.This unique structure enabled the A30-C5S5 aerogel to achieve superior compressive strength(392.49 kPa)while maintaining notable resilience.Subsequently,polydimethylsiloxane(PDMS)was introduced through a vacuum-assisted impregnation process,resulting in an AgNWs/CNF-C/SA/PDMS composite aerogel elastomer that demonstrated high mechanical strength while preserving its porous framework.The piezoresistive sensor assembled with this elastomer exhibited exceptional performance characteristics,including a high gauge factor(GF=−3.622@0%-3%),rapid response capability(response/recovery time of 34/39 ms),and outstanding cycling stability(1000 cycles).Furthermore,when implemented as a wearable device,the sensor successfully achieved real-time,accurate monitoring of human joint movements.This work presents a novel approach for developing flexible electronic devices with significant potential applications in smart wearables,health monitoring,and human-computer interaction.展开更多
基金support provided by the National Natural Science Foundation of China(No.22076154)the Guangdong Natural Science Foundation(No.2021A1515012334).
文摘Wearable piezoresistive sensors play a crucial role in smart healthcare,motion tracking,and human-computer interaction,yet conventional materials often suffer from limitations such as low sensitivity,poor flexibility,and insufficient durability.To address these challenges,this study presented anisotropic porous composite aerogels(A_(30)-C_(5)S_(5))fabricated through directional freeze-drying,incorporating silver nanowires(AgNWs)as a conductive network in combination with sodium alginate(SA)and carboxylate cellulose nanofiber(CNF-C)at an optimized ratio.The aerogel exhibited distinctive structural features:honeycomb-like dense pores in the XZ plane and a channel-type porous architecture in the XY plane.This unique structure enabled the A30-C5S5 aerogel to achieve superior compressive strength(392.49 kPa)while maintaining notable resilience.Subsequently,polydimethylsiloxane(PDMS)was introduced through a vacuum-assisted impregnation process,resulting in an AgNWs/CNF-C/SA/PDMS composite aerogel elastomer that demonstrated high mechanical strength while preserving its porous framework.The piezoresistive sensor assembled with this elastomer exhibited exceptional performance characteristics,including a high gauge factor(GF=−3.622@0%-3%),rapid response capability(response/recovery time of 34/39 ms),and outstanding cycling stability(1000 cycles).Furthermore,when implemented as a wearable device,the sensor successfully achieved real-time,accurate monitoring of human joint movements.This work presents a novel approach for developing flexible electronic devices with significant potential applications in smart wearables,health monitoring,and human-computer interaction.
