Fabrication And Wearable Performance Of A Dual-stress-responsive Textile-based Flexible Sensor

With the development of science and technology,people's requirements for textiles are not only the warmth and appearance of the beautiful.In the era of technology leading fashion,intelligent wearable textiles have attracted great interest.In the field of intelligent wearable,flexible wearable mechanical sensor has been widely concerned.It can transform the physical and mechanical stimulation of human body during the course of exercise into measurable,transmitted and recorded signals,so as to monitor the mechanical stimulation caused by the changes of human vital signs and external environment,and is widely used in medical,sports,health monitoring and human-computer interaction.The body will make various range of body movements during the movement,and will also suffer from external impact(such as boxing,bumping,etc.).Therefore,the development of a flexible sensor with multi stress mode to monitor the motion amplitude and external force stimulation of human body during the movement is the development demand of intelligent wearable technology.At present,most of the new electronic textiles used in motion monitoring only integrate single function discrete sensors to analyze the range of human motion or external force stimulation.But this way usually affects the accuracy of the sensor to monitor the range of action and external force stimulation in the same part of the human body during the movement,and it can not meet the needs of both stimuli monitoring in a large range,and the durability is poor.Therefore,it is still a challenge to develop a "one-piece" Textile Based Multi stress mode sensor to accurately monitor the range of human movement and external pressure stimulation,especially the large-scale movement changes and heavy external impact.The main contents of this paper are as follows:(1)The conductive yarn is prepared by soaking deposition of carbon nanotubes and graphene oxide on acrylic yarn.The conductive yarn is coated on the surface of elastic spandex filament by traditional spinning technology.The electrical resistance tension strain sensor with large deformation core yarn structure is prepared.The tensile strain sensor has a large range of tensile strain monitoring(0-80%),rapid response time(120ms)and negligible hysteresis(9.7%).More importantly,the sensor yarn has excellent sensing durability and can withstand 100000 stretch release cycles.(2)The conductive electrode fabric is obtained by weaving silver plated yarn through weft.Combined with the three-dimensional fabric,the capacitance pressure sensor with sandwich structure is assembled by hot melt bonding technology.The sensor has a wide range of pressure monitoring(0-110kpa),fast response time(340ms),negligible sensor hysteresis of 3.4%,It can withstand 100000 press release sensing test cycles.(3)The tensile strain sensor yarn is woven into silver plated conductive electrode fabric as a warp yarn by traditional weaving technology.The electronic fabric with the structure of "resistance capacitance integration" all textile base tensile / pressure double response array structure is constructed by combining hot melt bonding technology with spacer fabric.The sensing response law of multifunctional dual response array fabric is studied systematically.The synchronous monitoring of the motion amplitude and force of human body is realized,which shows great potential in the field of flexible electronics.