Preparation And Application Of Flexible Multi-function Sensor Based On Alignment Of Silver Nanowires

In recent years,the development of flexible wearable devices has been very rapid,and flexible sensors have received extensive attention and research as an important part of flexible wearable devices.Flexible sensors can be used to detect a variety of human physiological activities,converting physiological activity signals into visible electrical signals in the form of signal transmission,in human clinical diagnosis,health assessment,health monitoring,virtual electronics,flexible touch screens,flexible electronic skin,Even the fields of industrial robots have great application potential.At present,flexible sensors are mainly composed of a metal nanomaterial as a conductive layer and a polymer as a substrate.Ag nanowires(Ag NWs)have great advantages in flexible bending and sensitivity due to their excellent optical,electrical and mechanical stability properties.They are widely used in flexible strain sensors as a common material for sensor functional layers.Polydimethylsiloxane(PDMS)is one of the most commonly used substrate materials for flexible sensors and wearable electronic devices due to its simple preparation,fast curing,easy tearing,good elasticity and good biocompatibility.Although the current flexible sensor application scenarios are also very extensive,there are still some problems to be solved.For example,the application of flexible sensors is still limited to performance in terms of sensitivity,response time,and stretch range.How to improve the sensitivity and response speed of flexible sensors and improve the overall performance of flexible sensors is a hot research topic.In addition,in the existing research,flexible sensors are mostly prepared by compounding a single nano material with a polymer substrate,and the overall performance is not excellent enough.How to make flexible sensors have diverse functions is also a hot topic in current research.In this paper,by improving the experimental parameters and synthesizing ultra-fine silver nanowires with high aspect ratio,the performance of the flexible strain sensor based on Ag NWs is further improved,and a flexible substrate with micro-nano structure is prepared by a simple and low-cost method.Therefore,the structural improvement of the flexible transparent strain sensor is realized,and a flexible strain sensor based on Ag NWs-micro/nano structure substrate is prepared,and the performance of the micro-nano structure on the conductivity,transmittance,sensitivity,response time and stability of the sensor is explored.The impact of the micro-nano structure on the sensor performan ce analysis.The test results show that compared with the flexible substrate with flat surface and no micro-nano structure,the flexible sensor device prepared with the substrate with micro-nano structure has more performance in terms of sensitivity,response time,stretch range and stability.Excellent,the maximum sensitivity increased from 20.26 to 53.59,the response time was reduced from 100 ms to 54 ms,and the maximum tensile strain increased from70% to 100%.In this paper,one-step hydrothermal method was used to prepare one-dimensional nano-ZnO rods(ZnO NRs).Based on its flexible and transparent characteristics,it has a large specific surface area,low temperature synthesis and excellent UV detection properties.The flexible multi-function sensor of Ag NWs/ZnO NRs-micro/nano structure substrate enables it to detect various physical quantities such as ultraviolet and strain.The test results show that the flexible multi-function sensor based on Ag NWs/ZnO NRs-micro/nano structure substrate has good ultraviolet light response,the maximum photocurrent switching ratio is6.26,and has good dynamic response,and the response time is shortened to 44 ms.Therefore,the construction of the substrate microstructure and the recombination of the multi-nano materials can effectively improve the performance index of the flexible sensor.