【作者】 薛华；

【导师】 张彤；

【作者基本信息】 吉林大学 ， 工程硕士（专业学位）， 2024， 硕士

【摘要】 随着人工智能技术的发展,各种各样的智能产品已经逐渐进入人们的生产和生活,为人们创造了更加舒适、便利的环境。与传统的智能电子产品相比,柔性可穿戴电子设备实现强大的信息感知和数据交互的同时,更加轻便和多样化。柔性压力传感器作为柔性电子设备的核心部件之一,可以获取到许多人体生命体征信息,在健康管理和疾病监测领域有广泛应用。随着柔性压力传感器应用需求不断扩大,人们对其制作成本、敏感性能、穿戴舒适度等提出更高的要求。电容型压力传感器具有结构简单、稳定、低迟滞的优势,但目前基于平行板电容器结构的电容型压力传感器受其电容量限制存在灵敏度低、检测范围窄的问题。本论文对电容型柔性压力传感器的材料选择、敏感机理和构筑工艺展开研究,分别实现了基于滤纸基体的低成本、高灵敏度压力传感器和基于纳米纤维基体的超轻超薄、宽检测范围纸基压力传感器的构筑,并将传感器应用于人体生命体征信号监测。主要研究内容如下:1.针对电容型压力传感器灵敏度低的问题,选择商用纸张作为柔性基体构筑了基于双电层结构的纸基电容型柔性压力传感器。纤维素具有来源广泛、生物相容、可降解等优势,通常被作为柔性压力传感器领域重要的基体材料之一。本论文选用商用滤纸作为电极和敏感层的基体材料,采用丝网印刷工艺在滤纸表面制备图案化电极,敏感层通过简单的浸渍工艺处理,完成了柔性压力传感器的制作。商用滤纸的粗糙表面有效降低了传感器在无负载压力时的初始电容,双电层的构筑增大了传感器的电容量,传感器的灵敏度显著提高。2.针对商用滤纸柔韧性较差、穿戴不适和传感器检测范围较窄的问题,构筑了离子液体/纤维素纳米纸作为敏感层的纸基电容型压力传感器,具有低成本、超轻超薄的特点。石墨纸与离子液体/纤维素纳米纸相结合,在压力作用下,纳米纤维结构被压缩,纤维体积分数发生较大的变化,电极与敏感层界面双电层电容形成,压力传感器的检测范围显著提高。此外,传感器可以实现不同量程范围的运动信号和生命体征信号的监测。最后,将单元压力传感器集成,制作了具有更多压力检测位点和更大面积的压力传感阵列,可以实现对物体空间压力分布的检测和识别。更多还原

【Abstract】 With the development of artificial intelligence technology,various smart products have gradually entered people’s production and life,creating a more comfortable and convenient living environment for people.Compared with traditional smart electronic devices,flexible wearable smart devices achieve powerful information perception and data interaction while being more lightweight and diverse.Flexible pressure sensor,as one of the core components of flexible electronic equipment,can obtain a lot of human vital sign information and are widely used in the fields of health management and disease monitoring.With the increasing demand for flexible pressure sensors,people have put forward higher requirements for their production cost,sensitivity performance,and wearing comfort.Capacitive pressure sensors have the advantages of simple structure,stability,and low hysteresis.However,current capacitive pressure sensors based on parallel plate capacitor structure suffer from low sensitivity and narrow detection range due to their limited capacitance.This paper investigates the material selection,sensitivity mechanism,and construction process of capacitive flexible pressure sensors.The low-cost and high-sensitivity pressure sensor based on filter paper matrix and the ultra-light,ultra-thin,and wide detection range pressure sensor based on cellulose nanopaper matrix are constructed respectively,and the sensors are applied to monitor human vital signs signals.The main research contents are as follows:1.In response to the problem of low sensitivity of capacitive pressure sensors,commercial paper was selected as the flexible substrate to construct a paper-based capacitive flexible pressure sensor based on a double layer structure.Cellulose has advantages such as wide sources,biocompatibility,and biodegradability,and is often used as one of the important matrix materials in the field of flexible pressure sensors.This paper uses commercial filter paper as the substrate material for electrodes and sensitive layers,and uses screen printing technology to prepare patterned electrodes on the surface of the filter paper.The sensitive layer is processed through a simple impregnation process to complete the production of a flexible pressure sensor.The rough surface of commercial filter paper effectively reduces the initial capacitance of the sensor under no load pressure,and the construction of a double layer increases the capacitance of the sensor,significantly improving its sensitivity.2.In response to the problems of poor flexibility,discomfort in wearing,and narrow detection range of commercial filter paper,a paper-based capacitive pressure sensor with ionic liquid/cellulose nanopaper as the sensitive layer was constructed.It has the characteristics of low cost,ultra light and ultra-thin.When graphite paper is combined with ionic liquid/cellulose nanopaper,under pressure,the nanofiber structure is compressed,and the fiber volume fraction undergoes significant changes.Combined with the formation of a double layer capacitance at the interface between the electrode and the sensitive layer,the detection range of the pressure sensor is significantly improved.In addition,sensors can monitor motion signals and vital signs in different range ranges.Finally,the unit pressure sensor was integrated to create a pressure sensing array with more pressure detection sites and a larger area,which can detect the spatial pressure distribution of objects.更多还原