Research On Composite Optimization And Device Preparation Of Flexible Pressure Sensitive Conductive Materials

The rapid development of electronic sensor technology and composite materials has made breakthroughs in the research of flexible electronic devices,and various new types of flexible electronic devices have been introduced.Due to its flexible structural features,flexible electronic sensors can realize real-time monitoring of body information by twisting and fitting uneven human skin tissue.The development vision of flexible electronic devices has been widely expected by the society,and the development of flexible direction has become the trend of the times.In this paper,the composite optimization of multi-dimensional hybrid flexible conductive materials and flexible substrates is studied,and flexible pressure sensitive sensors with pressure sensitive and flexible characteristics are prepared.In order to obtain good conductivity,conductive materials are mainly selected from low-resistivity carbon and metal-based materials.In this paper,AgNWs,CNTs,and Pd nanoparticles are mainly used as conductive materials.Pd nanoparticles were sputtered onto the surface of the PDMS substrate,then AgNWs were sprayed onto the surface of the planar PDMS sputtered with Pd nanoparticles,and finally the CNTs were sprayed onto the AgNWs conductive layer.A pressure sensitive sensor of CNTs/AgNWs/Pd nanoparticle/PDMS composite structure was prepared.The preparation and optimization of a single conductive network sensor was first studied.Specifically,the preparation of AgNWs and the dispersion of CNTs are optimized by improved process parameters,the preparation of planar PDMS substrates,the sputtering of Pd nanoparticles on the surface of a flexible PDMS,and the spraying of a conductive network on a planar flexible PDMS surface.Finally,a single conductive network pressure sensitive sensor with AgNWs/PDMS structure and CNTs/PDMS structure was prepared.Secondly,the preparation and optimization of multi-dimensional hybrid conductive network pressure sensitive sensor are studied.AgNWs/CNTs/PDMS structure,CNTs/AgNWs/PDMS structure,mixed liquid/PDMS structure multi-dimensional hybrid conductive network pressure sensitive sensor were prepared by spraying AgNWs and CNTs on the surface of planar PDMS in different order.In order to obtain better conductivity and improve device performance,multi-dimensional hybrid conductive network pressure sensitive sensors with different structures are obtained by sputtering a certain thickness of Pd nanoparticles on the surface of the planar PDMS and then spraying different conductive materials in a certain order.After that,the motion response test of human joint parts such as fingers,throat,wrist,arm,etc.was carried out,and the performance parameters were compared and analyzed.Finally,in order to explore the effect of surface micro/nano structure on the performance of flexible pressure sensitive sensors,PDMS with different micro/nano structures prepared by sandpaper was used as flexible substrate,and then the surface micro-nano structure devices were tested under different parts of the body.In response to the data,the effect of the micro-nano structure on device performance is obtained.