Design And Application Of Flexible Pressure Sensor With Bionic Nest Structure

Flexible pressure sensor is an electronic device that converts mechanical stimuli into electrical signals.It has huge application prospects in wearable electronic devices,health monitoring,motion monitoring,software robots,human-computer interaction,and artificial intelligence.Wide working range and high sensitivity are vital performance parameters.Most researchers try to effectively improve the performance of flexible pressure sensors by using reasonable structural design based on the sensing mechanism.The first is the introduction of planar microstructure designs such as pyramids,Micro-pillars,micro hemispheres,and interlocking microstructures,etc.These structures effectively improve the sensor's sensitivity,response time,etc.However,the contact area of tiny-structured sensors can be easily saturated,leading to residual deformation after being subjected to high pressure.Another structural design is the introduction of a porous structure design.The porous structure design brings good compressibility,However,the viscoelasticity of most porous elastomer materials and the incompatibility between active materials and matrix materials have led to limited sensitivity and measurement ranges.Moreover,costly ingredients and fabrication processes have deterred the scalable production and application of soft electronics.The nests of animals in nature are amazing,such as the bee's regular such as honeycombs,spiders'webs,and ants'nests.The ant nest with a 3D interlaced hierarchical porous structure,has excellent mechanical properties.Inspired by the structure of the ant nest,we designed a flexible piezoresistive sensor based on a graded nest-like architecture,and introduced the manufacturing process,sensing mechanism,performance of the sensor,and various application in soft electronics areas.This thesis is mainly explained through the following aspects.1.Research on the preparation of the nest-architecture-based wide-range pressure sensor.It mainly includes the selection and optimization of matrix materials and active materials,and a detailed introduction of the fabrication process.2.The performance of the nest-architecture-based wide-range pressure sensor in this subject was experimentally explored.It mainly includes the sensitivity,working range,response time and fatigue characteristics of flexible pressure sensors.Experiments show that the pressure sensor has a wide pressure range(20 Pa-1.2 MPa),high sensitivity(1.12kPa^-1),excellent response time(15 ms),and good stability and fatigue characteristics.3.Exploring the sensing mechanism analysis of the nest-architecture-based wide-range pressure sensor and its application in wearable and intelligent detection such as:monitoring light-weight grains,real-time monitoring of biosignals such as venous and arterial blood pressure pulses,assisting grippers to complete gripping movements,monitoring dynamic information of bicycle tires,monitoring breathing,and detecting ethanol.It proves that this sensor has good application value in the fields of intelligent robots,wearable electronic devices,human biological information detection,and human-computer intelligent interaction.4.Application expansion of the nest-architecture-based wide-range pressure sensor.A self-powered pressure acquisition system was developed,and a triboelectric generator and pressure acquisition system was introduced in detail.