基于炭黑-钛酸钡/聚氨酯的柔性电容式压力传感器

陈续峰; 张宇; 秦亚飞; 王梦妍; 隋志源

基于炭黑-钛酸钡/聚氨酯的柔性电容式压力传感器

昆明理工大学　机电工程学院, 昆明 650500

基金项目: 国家自然科学基金 (52165066)；云南省基础研究面上项目(202101AT070106)

详细信息

通讯作者:
张宇，硕士，教授，硕士生导师，研究方向：数字化设计与制造　E-mail：498380267@qq.com

中图分类号: TB332
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- 文章访问数: 83
- HTML全文浏览量: 47
- 被引次数: 0
出版历程
- 收稿日期: 2023-12-08
- 修回日期: 2024-01-13
- 录用日期: 2024-01-26
- 网络出版日期: 2024-03-08

Flexible capacitive pressure sensor based on carbon black/barium titanate/polyurethane

The Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology,Kunming 650500, China

Funds: National Natural Science Foundation of China(52165066); Basic Research Project of Yunnan Province (202101AT070106)

摘要

摘要: 随着智能可穿戴柔性电子技术在生物医疗、电子皮肤、人机交互等领域的快速发展和应用，兼具高灵敏度和宽检测范围的柔性压力传感器的研究需求被提上日程。本文采用聚氨酯海绵(PU)作为基底，通过超声浸渍涂覆的方法将炭黑-钛酸钡(CB-BTO)复合材料结合在聚氨酯海绵上，制备出了CB-BTO/PU海绵柔性电容式压力传感器。经测试，传感器兼具了高灵敏度(~0.7911 kPa⁻¹)和宽的检测范围(0~300 kPa)等特性。同时，并对传感器的响应时间、最低检测限及稳定性等进行研究。此外，还对传感器进行了四个不同压力量程范围的应用测试，验证了传感器在高灵敏度和宽检测范围的应用潜力，为低成本、大规模制备高性能柔性传感器提供了新的可能性方案。
- 柔性 /
- 电容式压力传感器 /
- 模板组装法 /
- 高灵敏度 /
- 宽检测范围
Abstract: With the rapid development and application of smart wearable flexible electronic technology in biomedicine, electronic skin, human-computer interaction and other fields, the research demand of flexible pressure sensors with high sensitivity and wide detection range has been put on the agenda. In this paper, a CB-BTO/PU flexible capacitive pressure sensor was prepared by using the polyurethane sponge (PU) as the base and combining CB-BTO/ BTO composite material on the polyurethane sponge by ultrasonic dipping coating. After testing, the sensor combines high sensitivity (~0.7911 kPa⁻¹) and wide detection range (0~300 kPa). At the same time, the response time, the minimum detection limit and the stability of the sensor are studied. In addition, the sensor has been tested in four different pressure ranges, which verifies the potential of the sensor in high sensitivity and wide detection range, and provides a new possibility for low-cost and large-scale fabrication of high-performance flexible sensors.
- flexibility /
- Capacitive pressure sensor /
- Template assembly method /
- High sensitivity /
- Wide detection range

HTML全文

图 1 炭黑(CB)-钛酸钡(BTO)/聚氨酯(PU)海绵电容式压力传感器制备流程图

Figure 1. Preparation flow chart of carbon black (CB)-Barium titanate (BTO)/polyurethane (PU) sponge capacitive pressure sensor

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图 2 CB-BTO/PU海绵的形貌与结构表征：(a)是浸渍前后PU海绵实物图；(b)、(c)分别是PU海绵压缩的初始状态和压缩状态图；(d)、(e)、(f)是PU海绵断面SEM图像；(g)、(h)、(i)分别是Ba元素、Ti元素、C元素的EDS分布图(电子版为彩图)

Figure 2. Morphology and structure characterization of CB-BTO / PU sponge. (a) is the physical diagram of PU sponge before and after impregnation; (b) and (c) are the initial compression state and compression state diagrams of PU sponge respectively; (d), (e) and (f) are SEM images of PU sponge sections; (g), (h) and (i) are the EDS distribution diagrams of Ba element, Ti element and C element respectively (the electronic version is a color diagram).

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图 3 不同炭黑与钛酸钡质量比下的CB-BTO/PU海绵压力传感器电容变化率—压力变化曲线

Figure 3. Capacitance change rate-pressure change curve of CB-BTO/PU sponge pressure sensor with different mass ratio of carbon black to barium titanate.

$ \Delta C/{C}_{0} $—Relative variation of capacitance signal

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图 4 炭黑与钛酸钡质量比为5∶100下的CB-BTO/PU海绵压力传感器灵敏度曲线

Figure 4. Sensitivity curve of CB-BTO/PU sponge pressure sensor at 5∶100 mass ratio of carbon black to barium titanate

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图 5 CB-BTO/PU海绵压力传感器的性能参数：(a)响应时间/恢复时间；(b)最低检测限;(c)不同压力下的响应；(d)循环稳定性

Figure 5. Performance parameters of CB-BTO/PU sponge pressure sensor: (a) response time/recovery time; (b) Minimum detection limit; (c) Response under different pressures; (d) Cyclic stability

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图 6 CB-BTO/PU海绵压力传感器在各种变形信号监测中的应用：(a)手指点击鼠标上传感器的响应(0~5 kPa)；(b)指关节弯曲的传感器响应(0~7 kPa)；(c)抓取不同质量玻璃杯的传感器响应(0~40 kPa)；(d)足底压力和步态监测的传感器响应(0~110 kPa)

Figure 6. Application of CB-BTO/PU sponge pressure sensor in monitoring various deformation signals: (a) Response of sensor when finger clicks the mouse(0~5 kPa); (b) Sensor response of knuckle bending(0~7 kPa); (c) Sensor responses for grabbing glasses with different qualities(0~40 kPa); (d) Sensor response of plantar pressure and gait monitoring(0~110 kPa).

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表 1 CB-BTO/PU传感器与文献报道性能比较

Table 1. Performance comparison between CB-BTO / PU sensor and literature report

Materials	Sensitivity	Detection range		Reference
TiO₂@PU	0.93 kPa⁻¹ (0~0.37 kPa) 0.079 kPa⁻¹ (0.37~2.83 kPa) 0.02 kPa⁻¹ (2.83~10 kPa)	0~10 kPa	[33]
CCTO@PU	0.73 kPa⁻¹(0~1.6 kPa) 0.135 kPa⁻¹(1.6~22.8 kPa) 0.026 kPa⁻¹(22.8~100 kPa)	0~100 kPa	[34]
GO/CNTs@TPU	0.05777 kPa⁻¹ (0~5 kPa) 0.33213 kPa⁻¹ (5~60 kPa)	0~60 kPa	[35]
GNPs/MWCNTs/SR/PS	0.062 kPa⁻¹ (0~0.3 kPa) 0.033 kPa⁻¹ (0.3~4.5 kPa)	0~4.5 kPa	[36]
CB-BTO/PU	0.6311 kPa⁻¹(0~10 kPa) 0.7911 kPa⁻¹(10~140 kPa) 0.1395 kPa⁻¹(140~300 kPa)	0~300 kPa	This work

Notes: TiO₂-Titanium Dioxide; CCTO-Calcium copper titanate; GO-Graphene Oxide; CNTs- Carbon Nanotube; TPU-Thermoplastic Polyurethane; GNPs-Graphene nanosheets; MWCNTs-carboxyl-functionalized multiwalled carbon nanotubes; SR-Silicone rubber; PS-commercial polyurethane sponge.

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表 2 CB-BTO/PU传感器与文献报道耐久性比较

Table 2. Comparison of durability between CB-BTO/PU sensor and literature report

Number of cycle tests	Circulating pressure range/Circulating strain range	Reference
500	0~1.7 kPa	[30]
2000	100%	[31]
35000	100%	[32]
2500	0~200 kPa	This work

下载: 导出CSV

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