Flexible, Visual, and Multifunctional Humidity-Strain Sensors Based on Ultra-Stable Perovskite Luminescent Filaments

IF 17.2 1区 工程技术 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xiaofang Li, Qi Liu, Yunpeng Liu, Liyan Yang, Mufang Li, Bo Wang, Yanyan Li, Yuedan Wang, Tao Wang, Dong Wang
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Abstract

Flexible multifunctional sensors have attracted much attention in applications such as physiological monitoring, smart clothing, and electronic skin. However, the visual and multifunctional humidity-strain sensors following integration face the challenges of suboptimal sensing performance, inferior durability, mutual interference, and difficulties on large-scale production. Herein, a flexible, visual, and multifunctional humidity-strain sensor based on ultra-stable perovskite luminescent filament (carbon nanotubes/sodium polyacrylate (PAAS)/perovskite/thermoplastic polyurethane (CPPT)) with coaxial structure is first introduced by the environmental-friendly wet-spinning and dip-coating method. The CPPT filaments display homogeneous and bright luminescence under 200% deformations, tunable emission spectrum, wide color gamut, and high stability due to the polymer-encapsulation effect and uniform distribution of perovskite nanocrystals. The carbon nanotubes/PAAS as the outer layer undertakes radial thickness expansion upon moisture exposure. The elastic perovskite/thermoplastic polyurethane as the core bears large deformation during stretching. The CPPT filaments achieve a resistance change of 130% in the relative humidity of 95%, fast response/recovery (3.2/4.0 s), small hysteresis (3.5%), high durability, and weak interference from temperature. Besides, it obtains a Gauge factor of 27.0 at a strain of 95–200%, fast response/recovery (0.2/0.3 s), and negligible interference from temperature. The flexible CPPT filaments not only show great potential in humidity sensing, strain sensing, and information encryption but also open up new opportunities for facile integration into more complex scenarios, such as human physiological activity monitoring with an early hazard warning.

Graphical Abstract

基于超稳定钙钛矿发光灯丝的柔性、视觉和多功能湿度应变传感器
柔性多功能传感器在生理监测、智能服装、电子皮肤等领域受到广泛关注。然而,集成后的视觉和多功能湿度应变传感器面临着传感性能不理想、耐用性差、相互干扰和难以大规模生产的挑战。本文首次采用环境友好的湿纺丝和浸涂法,设计了一种基于超稳定钙钛矿发光丝(碳纳米管/聚丙烯酸钠(PAAS)/钙钛矿/热塑性聚氨酯(CPPT))同轴结构的柔性、可视化、多功能湿度应变传感器。由于聚合物包封效应和钙钛矿纳米晶体的均匀分布,CPPT长丝在200%变形下显示出均匀明亮的发光,发射光谱可调,色域宽,稳定性高。作为外层的碳纳米管/PAAS在受潮时发生径向厚度膨胀。弹性钙钛矿/热塑性聚氨酯作为芯材,在拉伸过程中承受较大的变形。在相对湿度为95%时,CPPT长丝的电阻变化可达130%,响应/恢复快(3.2/4.0 s),迟滞小(3.5%),耐用性高,温度干扰小。在95 ~ 200%应变下,应变系数为27.0,响应/恢复速度快(0.2/0.3 s),温度干扰可忽略不计。柔性CPPT灯丝不仅在湿度传感、应变传感和信息加密方面显示出巨大的潜力,而且为更复杂的场景(如人体生理活动监测和早期灾害预警)的便捷集成开辟了新的机会。图形抽象
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来源期刊
CiteScore
18.70
自引率
11.20%
发文量
109
期刊介绍: Advanced Fiber Materials is a hybrid, peer-reviewed, international and interdisciplinary research journal which aims to publish the most important papers in fibers and fiber-related devices as well as their applications.Indexed by SCIE, EI, Scopus et al. Publishing on fiber or fiber-related materials, technology, engineering and application.
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