| As an important form of wearable electronics,electronic textiles or electronic garments have attracted more and more attention in recent years.Integrating electronic devices and systems into daily wear clothing can be an ideal solution for electronic garments.Among them,the common technical problem of electronic garments is to prepare stable and reliable interconnector on the rough,porous or even elastic fabric,and simultaneously be compatible with the three-dimensional(3D)clothing manufacturing process,so as to realize the effective interconnection of functional devices scattered in different areas.In view of this,this thesis is carried out in three stages:Development of fabric-based electrode preparation process,optimization of tensile properties,and research on integration strategy compatible with 3D clothing,to achieve the preparation of long-distance,stretchable,highly conductive,washable,wear-resistant and embedded interconnectors on 3D clothing.Finally,12-lead ECG monitoring clothing is taken as an application demonstration,to exhibit the application potential of this method in electronic garments.The main work is as follows:1.Fabrication and performance evaluation of thermal transfer printed textile electrodes with excellent durability.In this chapter,a new preparation method of fabric electrodes is developed.Silver flakes are selected as conductive fillers,and two kinds of thermoplastic polyurethane material with different melting points are used as hotpressing adhesive material and resin of conductive ink respectively.The patterned electrodes are prefabricated on a release film by blade coating and laser engraving,and then laminated by hot-pressing to a variety of fabrics,which has become a universal and scalable preparation technique.It is found that the main factors affecting the conductivity of fabric electrode are mass fraction of conductive filler in ink,hot sintering temperature and hot-pressing process.By optimizing the above parameters,the fabric electrode exhibits excellent conductivity(5.48 × 104 S/cm),high adhesion(≥1 600 N/m),good abrasion/washing resistance,and high patterning resolution(40μm).2.Optimization of stretchability of fabric electrode based on elastic knitted fabric.Based on the method mentioned above,elastic knitted fabric was used as the substrate to further optimize the stretchability.In this paper,the tensile mechanism of elastic knitted fabric is studied systematically.Hot melt adhesive(HMA)layer can effectively mitigate the uneven deformation of the fabric,and provide a reliable support platform for the conductive layer as well as serve as a medium to binding with the fabric.The penetration degree into the fabric pores is adjusted by adjusting the thickness of the HMA layer,so as to improve the tensile property of the fabric electrode.The optimized stretchable fabric electrode can work stably within 100%strain(the resistance changes about 4 times at 100%strain),and maintains good electrical and mechanical stability after 10 000 tension-release cycles.3.Research on device integration strategy compatible with 3D clothing processing and application in ECG monitoring garment.The preparation method mentioned in previous chapters is applied to electronic garment as the preparation method of interconnector.Combined with clothing design,the circuit system of 3D clothing is planarization onto 2D cut panels,and then assembled into 3D clothing after preparation,so as to obtain the electronic garment.Referring to international standards,the comprehensive durability and comfort evaluation of electronic garment is carried out.The results show that the clothing equipped with electrodes and circuits still maintains satisfactory comfort similar to sportswear,and the circuits can meet the requirements of washing and wearing abrasion in daily life.Finally,a 12-lead ECG monitoring system for health management is selected as the application demonstration of this method,demonstrating the potential of this method in building a wearable human health monitoring system. |
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