Halloysite nanotube modified piezo-electric hydrogel with multi-functional properties

IF 4.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2025-02-17 DOI:10.1016/j.sna.2025.116320

Khashti Datt Pandey, Indranil Maity, Ajay D. Thakur

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引用次数: 0

Abstract

Soft multifunctional piezo-electric hydrogels are of great interest due to their unique structural and functional properties, adaptability, and biocompatibility. This study presents a multifunctional piezo-electric blend hydrogel synthesized using polyvinyl alcohol (PVA), poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), and the alumino-silicate nanofiller, halloysite nanotubes (HNT) at various percentage contents, employing the freeze-thaw method. This flexible hydrogel has been found to exhibit a high piezo-electric current response and dielectric constant, piezo-resistive property, and electret nature, which are influenced by varying HNT content. Mechanical and electrical properties, including tensile strength, dielectric properties, swelling ratio, electrical conductivity, piezo-response, piezo-resistive capability, and the electret nature of the hydrogels, were evaluated. Pressure induced voltage upon finger-tapping and observation of resistance changes upon flexing have been demonstrated suggesting their potential applications in mechanical energy harvesting for wearable devices and in soft robotics.

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柔软的多功能压电水凝胶因其独特的结构和功能特性、适应性和生物相容性而备受关注。本研究采用冻融法合成了一种多功能压电混合水凝胶，该水凝胶由聚乙烯醇（PVA）、聚偏氟乙烯-六氟丙烯（PVDF-HFP）和铝硅酸盐纳米填料哈洛石纳米管（HNT）以不同的百分比含量制成。研究发现，这种柔性水凝胶具有较高的压电电流响应和介电常数、压阻特性和驻极体性质，这些特性受不同 HNT 含量的影响。研究人员评估了水凝胶的机械和电气性能，包括拉伸强度、介电性能、膨胀率、导电性、压电响应、压阻能力和驻极体性质。手指敲击时产生的压力感应电压和弯曲时电阻变化的观察结果均已得到证实，这表明它们有望应用于可穿戴设备的机械能采集和软机器人技术中。

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...