南方科技大学知识苑(SUSTech KC): 基于压电聚合物PVDF-TrFE的柔性传感器制备及应用

题名	基于压电聚合物PVDF-TrFE的柔性传感器制备及应用
其他题名	FABRICATION AND APPLICATION OF FLEXIBLE SENSOR BASED ON PIEZOELECTRIC POLYMER PVDF-TrFE
姓名	吴和丰
姓名拼音	Wu Hefeng
学号	12032292
学位类型	硕士
学位专业	0856 材料与化工
学科门类/专业学位类别	0856 材料与化工
导师	郭师峰
导师单位	深圳先进技术研究院
论文答辩日期	2022-05-11
论文提交日期	2022-06-24
学位授予单位	南方科技大学
学位授予地点	深圳
摘要	随着 5G和人工智能时代的到来，智能传感器行业迅速崛起，未来市场前景广阔。其中，压电传感器在可穿戴设备、人机交互以及结构健康监测领域的需求与应用大幅增加，而传统的刚性压电传感器存在体积大、质量重、耦合性差等缺点，迫切需要开发体积小、重量轻、耦合性好、灵敏度高、易加工的柔性压电传感器。本论文在国自然联合基金重点项目和深圳市智慧传感与系统检测重点实验室资助项目的支持下，以柔性压电聚合物PVDF-TrFE作为研究对象，对其制备工艺压电性能展开研究，并针对其在结构健康监测以及手势识别领域的应用进行探索。首先是分析退火和极化等工艺对喷涂制备PVDF-TrFE薄膜的结晶行为和压电性能的影响，优化功能化参数，制备出高性能的柔性PVDF-TrFE压电薄膜；进一步设计并制备基于压电聚合物PVDF-TrFE的柔性传感器，探索其在结构健康监测以及手势识别领域的应用。主要结论如下：（1）研究了退火、极化参数对压电性能的影响。在居里温度Tc和熔融温度 Tm之间进行退火处理，可以显著提高PVDF-TrFE薄膜的结晶度，且温度越高，退火所需时间越短；在 40 kV的电压下对退火后的PVDF-TrFE薄膜进行电晕极化 5个循环，能获得最佳的压电性能，其压电应变常数值为 19.5±0.6 pm/V。（2）探索了PVDF-TrFE压电传感器在结构健康监测领域的应用。在 300kHz 的激发频率下，制备的PVDF-TrFE超声换能器能同时产生A0 模态和S0 模态的导波，且A0模态在缺陷识别上更占优势；在窄板结构上，A0模态导波在经过缺陷后会出现明显的信号衰减（从 41 mV下降到 21 mV）；在板材结构上，通过传感网络同样能有效检测到经过缺陷后A0 模态信号幅值的变化。（3）探索了PVDF-TrFE压电传感器在手势识别领域的应用。对于制备的PVDF-TrFE柔性压电传感器，在 30 N的荷重下能产生约 52 mV的输出电压，且具有很好的稳定性；在弯曲实验中，传感器的弯曲角度越大，其输出电压值越高，呈正相关的关系，且在弯曲角度为 90°时，输出电压约为 45 mV；制备的传感器表现出高灵敏度，对于简单的手势进行了有效的区分与识别，体现了PVDF-TrFE 压电传感器在手势识别领域的巨大应用潜力。本论文制备的高性能PVDF-TrFE压电聚合物薄膜，实现了对工程结构缺陷以及手势动作的识别，在结构健康监测和人机交互领域上具有很大的应用潜力。
其他摘要	With the advent of the era of 5G and artificial intelligence, the smart sensor industry has risen rapidly with broad prospects. Among them, the applications and demand of piezoelectric sensors in the fields of wearable devices, human-computer interaction and structural health monitoring have increased significantly. The conventional rigid piezoelectric sensors have shortcomings in large size, heavy weight, and poor coupling, therefore, there is an urgent requirement to develop flexible piezoelectric sensors with small size, light weight, good coupling, high sensitivity and easy processing. Supported by the National Natural Science Foundation of China (Grant No. U2133213) and the Science and Technology Innovation Commission of Shenzhen (Grant No. ZDSYS20190902093209795), this thesis focus on developing high flexible piezoelectric transducer and its applications. The preparation process and piezoelectric properties of PVDF-TrFE were detailedly studied, and its application in structural health monitoring and gesture recognition was explored. The effects of annealing and polarization processes on the crystallization behavior and piezoelectric properties of PVDF-TrFE films prepared by spraying were optimized to fabricate high-performance flexible PVDF-TrFE piezoelectric films. The flexible sensor based on piezoelectric polymer PVDF-TrFE was further designed and fabricated, and its applications in the structural health monitoring and gesture recognition were explored. The main conclusions are summarized below: (1) The effects of annealing and polarization parameters on the piezoelectric properties were studied. Annealing between the Curie temperature Tc and the melting temperature Tm can significantly improve the crystallinity of PVDF-TrFE films, and the higher the temperature, the shorter the annealing time. The film after annealing was subjected to corona polarization at a voltage of 40 kV for 5 cycles to obtain the best piezoelectric property with the piezoelectric strain constant value of 19.5±0.6 pm/V. (2) The application of PVDF-TrFE piezoelectric sensors in the structural health monitoring was explored. At the excitation frequency of 300 kHz, the prepared PVDF-TrFE-based ultrasonic transducer can generate guided waves of A0 mode and S0 mode, and the A0 mode is more dominant and selected in defect identification. On the narrow strip, the amplitude of A0 mode wave decreased significantly after passing through the defect, reducing from 41 mV to 21 mV. On the plate structure, the change of the amplitude of A0 mode signal after passing through the defect can also be successfully detected through the sensor network. (3) The application of PVDF-TrFE piezoelectric sensors in gesture recognition was also explored. The prepared PVDF-TrFE-based flexible piezoelectric sensor can generatean output voltage of about 52 mV under a load of 30 N, and has good stability. During the bending motion, the greater the bending angle of the sensor, the higher the output voltage, as the positive correlation. When the bending angle is 90°, the output voltage is about 45 mV. The prepared sensors can effectively distinguish and recognize simple gestures, which exhibit high sensitivity and great application potential in the field of gesture recognition. The high-performance PVDF-TrFE piezoelectric polymer sensors prepared in this thesis realize the recognition of engineering structural defects and gestures, and have great application potential in the fields of structural health monitoring and human-omputer interaction.
关键词	PVDF-TrFE 柔性传感器传感网络结构健康监测手势识别
语种	中文
培养类别	独立培养
入学年份	2020
学位授予年份	2022-06
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所在学位评定分委会	中国科学院深圳理工大学（筹）联合培养
国内图书分类号	TQ 317.5
来源库	人工提交
成果类型	学位论文
条目标识符	http://sustech.caswiz.com/handle/2SGJ60CL/342766
专题	中国科学院深圳理工大学（筹）联合培养
推荐引用方式 GB/T 7714	吴和丰. 基于压电聚合物PVDF-TrFE的柔性传感器制备及应用[D]. 深圳. 南方科技大学,2022.

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12032292-吴和丰-中国科学院深圳（5699KB）	--	--	限制开放	--	请求全文