Preparation And Electrical/Thermal Behavior Characterization Of AgNWs/MXene Based Fabrics

Flexible and wearable smart textiles with good ductility and functionality have attracted increasing attention.Among the piezoresistive strain sensors used for human motion detection,wide strain detection range,high sensitivity,and high durability are the focus of health monitoring and cyclic stretching motion monitoring applications.Multifunctional flexible intelligent electronic devices that can meet the daily comfort of the human body and record real-time human motion signals are the main requirements of wearable intelligent sensors for the human body.However,currently,most intelligent wearable fabrics often cannot simultaneously possess sensing properties such as wide strain range,high sensitivity,and high durability.Therefore,it is necessary to explore the sensing mechanism and performance of strain sensing fabrics through the construction of new materials and the design of new conductive networks,and develop high-performance and multi-functional flexible wearable intelligent fabrics that detect human motion.This has far-reaching guiding significance and practical value.In response to the appeal issue,this article prepared silver nanowires（AgNWs）and MXene nanosheets,and prepared multifunctional wearable intelligent sensing fabrics using polyester fabric as a substrate through the design of structures.The electromagnetic shielding,strain sensing,electrical heating,and durability of AgNWs polyester fabrics,AgNWs/MXene polyester fabrics,and PDMS（polydimethylsiloxane）encapsulated AgNWs/MXene/PET fabrics were investigated and compared.（1）Preparation and research of AgNWs/PET sensing fabric.First,silver nanowires were prepared by polyol method.AgNWs were loaded on polyester fabric by different coating times.The electrothermal properties,resistance temperature sensitivity,electromagnetic shielding properties,strain sensing and washability of the fabric were tested.Result display,the conductivity of 2.8 mg/cm²AgNWs fabric coating is up to 175 S/m,and the EMI shielding efficiency is 37 d B.Meanwhile,it has a highly sensitive strain response to human movement（the strain coefficient under 10%strain is 6.16）.Under 0.10 A applied current,the heating temperature can reach more than 100℃within 27 seconds.In addition,the resistance temperature sensitivity behavior of AgNWs/PET fabric was obtained,and the negative resistance temperature coefficient（TCR）of fabric was-0.05%/℃.（2）Preparation and research of AgNWs/MXene sensing fabrics.One dimensional（1D）AgNWs and two dimensional（2D）transition metal carbide/carbonitride（MXene）nanosheets were deposited on the DA·HCl modified polyester fabric.The multi-functional fabric has excellent mechanical durability（>1000cycles of stretching）,a wide strain sensing range（～445%）of highly elastic knitted fabric,and excellent Joule heating performance(when the current is 0.10 A,the fabric can reach a balanced temperature of about 126℃in 37 seconds,the electrothermal conversion efficiency h_r+c is 0.13,and the maximum heating rate is 9.73℃/s)and temperature sensing performance（the resistance temperature coefficient（TCR）is-0.07%/℃）.（3）Preparation and research of PDMS/MXene/AgNWs/PET sensing fabrics.One dimensional（1D）silver nanowires（AgNWs）and two dimensional（2D）MXene nanosheets are bridged on PET knitted fabrics to build interconnected conductive networks,and then impregnated with PDMS layers to prepare high-performance and durable multi response fabrics.The multi response fabric has excellent electromagnetic shielding effect（54 d B in X-band）and excellent durability（more than 3000 tensile cycles）.In addition,this fabric has good Joule heating performance（the fabric can reach140℃in 10 seconds under 0.5 A current）and photothermal performance（the temperature can reach 54℃under sunlight）.