基于复合介电材料的印刷柔性压力传感器研究

发布时间：2018-03-23 23:21

本文选题：复合介电材料　切入点：印刷电子　出处：《北京印刷学院》2017年硕士论文

【摘要】：新型柔性压力传感器因为其具备灵敏度高、灵活性强等特点,已被广泛应用于各种柔性电子器件中,扩大了传统传感器的应用领域,开拓了新兴市场。然而,柔性压力传感器较低的灵敏度以及复杂的制作工艺制约了其应用领域的进一步扩大。为了提高柔性压力传感器的灵敏度,本论文从传感器原理出发进行分析和论证,选用纳米复合材料为电容式柔性压力传感器的介电层材料,利用印刷法制备器件电极,提高了受力情况下器件介电层介电常数的变化率,简化了制作过程,使得器件灵敏度与制作工艺效率得到了较大提高。本论文的主要研究内容包括以下三个方面:(1)研究了碳纳米管含量和长径比对复合材料介电性能、机械性能的影响;(2)将优化后的碳纳米管/聚二甲基硅氧烷复合材料(CNT/PDMS)制作成柔性压力传感器的介电层,探究不同复合介电材料对柔性压力传感器性能的影响;(3)探究基于复合介电材料的阵列式柔性压力传感器的印刷方法,研究丝网印刷工艺、电极基材表面特性对印刷阵列电极性能的影响。研究结果发现:(1)随着碳纳米管长径比的减小,CNT/PDMS复合材料的渗透阈值增加,相同掺杂比例时的杨氏模量同时增加;(2)利用较大长径比碳纳米管掺杂形成的CNT/PDMS复合材料,在压缩状态下介电常数增长率更加明显,其中,TNMH1(长径比为1250~3750)碳纳米管为掺杂剂时,复合材料介电常数在压缩状态下,(10kHz频率下,35kPa压力下)增加至原来的740%;(3)使得柔性PDMS电极基底的接触角从110°降至40°,将纳米银导电油墨与导电高分子混合比例从10:2时,油墨的导电性较好,丝网印刷得到的柔性电极稳定性提高。本文将得到柔性压力传感器中,由TNMH1复合介电层组装的器件灵敏度可以达到2.9kPa~(-1),响应时间为50ms,且能够实现微小压力分布测试的柔性压力传感器阵列,对于物体形状,和指肢体活动产生的微小应力的测量。本文研究得到的印刷压力传感器有望用于可穿戴电子皮肤领域。
[Abstract]:Because of its high sensitivity and high flexibility, the new flexible pressure sensor has been widely used in various flexible electronic devices, expanding the application of traditional sensors and opening up a new market. The low sensitivity of the flexible pressure sensor and the complicated manufacturing process restrict the further expansion of its application field. In order to improve the sensitivity of the flexible pressure sensor, this paper analyzes and demonstrates the principle of the sensor. Using nanocomposites as dielectric layer material of capacitive flexible pressure sensor, the device electrode was prepared by printing method. The change rate of dielectric constant of dielectric layer was improved and the fabrication process was simplified. The main contents of this thesis include the following three aspects: the content of carbon nanotubes and the dielectric properties of composites with aspect ratio of length to diameter. Effect of Mechanical Properties on the dielectric layer of the flexible pressure Sensor, CNT / PDMS was prepared from the optimized CNT / PDMS composite. To explore the effect of different composite dielectric materials on the performance of flexible pressure sensors. (3) to explore the printing methods of array flexible pressure sensors based on composite dielectric materials, and to study screen printing technology. The effect of electrode substrate surface characteristics on the performance of printed array electrodes. The results show that the permeability threshold of CNT / PDMS composites increases with the decrease of aspect ratio of CNT / PDMS. Under the same doping ratio, the growth rate of dielectric constant of CNT/PDMS composites with larger length diameter than that of carbon nanotube doping is more obvious, especially when the ratio of length to diameter is 1250 / 3750 carbon nanotubes as dopant, and the increase rate of dielectric constant is more obvious in the compression state than that in carbon nanotubes doped with carbon nanotubes with the same doping ratio, and the ratio of length to diameter is 1250 / 3750. The dielectric constant of the composite increased to the original 740kPa pressure at a compression state of 10kHz. The contact angle of the flexible PDMS electrode substrate was reduced from 110 掳to 40 掳, and the ratio of conductive nano-silver ink to conductive polymer was mixed from 10:2. The electric conductivity of ink is better, and the stability of flexible electrode obtained by screen printing is improved. In this paper, the flexible pressure sensor will be obtained. The sensitivity of the device assembled by the TNMH1 composite dielectric layer can reach 2.9 KPA ~ (-1), the response time is 50 Ms, and the flexible pressure sensor array, which can be used to measure the micro-pressure distribution, is suitable for the shape of the object. The printed pressure sensor obtained in this paper is expected to be used in the field of wearable electronic skin.
【学位授予单位】：北京印刷学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB33;TP212

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