Journal of Materials Research and Technology-JMR&T
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2022
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IF 6.267
Yulin Ma,Mingming Liu,Yange Feng,Hongyu Zheng,Yongling Wu
Piezoelectric polyvinylidene fluoride (PVDF) based piezoelectric materials are good candidates for energy harvesting devices and sensing systems. Improving the piezoelectric sensitivity of the electro-spun PVDF fibers is still challenging and highly desirable. In this work, ZnO@Ag nanoparticles were synthesized and utilized as surface modifier to generate a hierarchical structure on the fiber surfaces to construct a flexible and piezoelectric three-phase coupling sensor. The effects of the atomic ratio of Ag:ZnO, surface morphology and particle concentration of ZnO@Ag nanoparticles on the β-phase content, piezoelectricity, wettability and mechanical stability of the sensor device were systematically investigated. The elastic modulus of ZnO@Ag/PVDF membrane is 0.01322 GPa, which is close to that of human skin 0.0188 GPa. Due to synergistic effect of the enhanced electrostatic field polarization and surface hierarchical structure, the ZnO@Ag/PVDF piezoelectricity sensor possessed voltage and current outputs of 15.0 V pp and 1.775 μA respectively, which were 3.5 and 5.4 times higher than pure PVDF-based sensor. The sensitivity of the ZnO@Ag/PVDF nanofiber-based sensor was 2.422 V/kPa, which was 14.4 times higher than that of pure PVDF-based sensor. The sensor has a fast response/recovery time of 30/45 ms. The sensor can accurately detect various physiological strain signals such as cantilever oscillatory excitation, finger press, or walking behavior, and can light-up several light-emitting diodes (LEDs) and charge a capacitor (20 μF) in a short period (2.41 V in 5 Sec). This fiber-based energy harvesting and pressure sensor demonstrates promising applications in self-powered flexible wearable electronic devices in healthcare and home-care fields.
研究领域:
材料科学
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传感器技术
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生物医学工程
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DOI
高影响因子
Coatings
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2022
·Vol. 12
·期 7
·905
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IF 3.236
Yuqiong Zhang,Chenglin Qing,Yixuan Lin,Yunlong Guan,Wenhua Dai,Yingxia Yang,Gaofeng Deng,Li Guan
The stir-frying process in Chinese cooking has produced serious emissions of oily particles, which are an important source of urban air pollution. In particular, the complex composition of fine particulate may pose a threat to human respiratory and immune systems. However, current filtration methods for oily particulate fumes have low filtration efficiency, high resistance, and high equipment costs. In polypropylene (PP) electret filters, efficiency rapidly decreases and pressure drop (wind resistance) sharply increases after the adsorption of oily particles, due to the oleophilic properties of the PP fibre. We addressed this issue of filter performance degradation by fabricating a sodium perfluorooctanoate (SPFO) oleophobic coating on polyvinylidene fluoride (PVDF) fibre membranes for oily particle filtration. The SPFO coating showed a promising oleophobic effect even at low concentrations, which suggests it has oleophobic properties for different oil types and can be modified for different substrates. This fabricated oleophobic coating is thermostable and the oleophobic effect is unaffected by temperatures from 0 to 100 °C. By modifying the SPFO coating on the PVDF membrane, a high filtration efficiency (89.43%) and low wind resistance (69 Pa) was achieved without oil adhesion, so the proposed coating can be applied in the filtration and purification of oily fine particles and offers a potential strategy for preventing atmospheric oil pollution.Keywords:oleophobic coating;sodium perfluorooctanoate;PVDF fibre;oily particles filtration
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Jun Yu,Tiantian Yue,Mengqi Wang,Yi Liu,Fan Liao,Zhenhui Kang,Yuqing Liu
Flexible piezoelectrics are pivotal for self-powered wearable systems, yet low-dimensional materials like PVDF fibers suffer from inefficient β-phase crystallization and limited charge transport. Here, coaxial wet-spun polyvinylidene fluoride (PVDF) fibers integrated with carbon quantum dots (CDs) overcome these limitations via solvent-nonsolvent phase separation and mechanical stretching. A 3 wt% CDs doping induces 75.96 % β-phase content through interfacial hydrogen bonding, achieving a high piezoelectric coefficient (d 33 of 28 pC/N) and output performance of 19.4 V and 0.2 μA, which is 86.7 % surpassing pristine PVDF(15 pC/N), and Under optimal experimental conditions, the peak voltage and current can reach up to 31 V and 0.2 μA. Cyclic durability tests (3 Hz, 20 N, 1000 cycles) confirm excellent stability with > 90 % performance retention. Practical applications highlight rapid capacitor charging (5 V in 30 s) and the ability to power nine LEDs. Additionally, bending sensitivity (3.6 V at 60°) and motion sensing (9 V for arm bending) validate its adaptability for wearable electronics and IoT applications, offering a scalable strategy for high-performance flexible energy harvesters.
研究领域:
材料科学
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能源技术
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纳米科技
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 19
·2011073
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IF 18.808
Huiying Chen,Linlin Zhou,Zhi Fang,Shuize Wang,Tao Yang,Laipan Zhu,Xinmei Hou,Hailong Wang,Zhong Lin Wang
Inorganic lead halide perovskite has become an emerging material for modern photoelectric and electronic nanodevices due to its excellent optical and electronic properties. In view of its huge dielectric and electrical properties, inorganic CsPbBr 3 perovskite is introduced into the piezoelectric nanogenerator (PENG). Based on one-step electrospinning of solutions containing CsPbBr 3 precursors and polyvinylidene difluoride (PVDF), in situ growth of CsPbBr 3 nanocrystals in PVDF fibers (CsPbBr 3 @PVDF composite fibers) with highly uniform size and spatial distribution are synthesized. The CsPbBr 3 @PVDF composite fibers based PENG reveals an open-circuit voltage ( V oc ) of 103 V and a density of short-circuit current ( I sc ) of 170 µ A cm −2 , where the V oc is comparable to the state-of-the-art hybrid composite piezoelectric nanogenerators (PENGs) and the density of I sc is 4.86 times higher than that of lead halide perovskites counterpart ever reported. Moreover, CsPbBr 3 @PVDF composite fibers based PENG exhibits fundamentally improved thermal/water/acid–base stabilities. This study suggests that the CsPbBr 3 @PVDF composite fiber is a good candidate for fabricating high-performance PENGs, promising application potentials in mechanical energy harvesting and motion sensing technologies.
研究领域:
材料科学
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纳米技术
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能源 harvesting 技术
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产品关联
DOI
高影响因子
Nano Energy
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2024
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IF 16.8
Yuanchao Guo,Haonan Zhang,Lin Fang,Zixun Wang,Wen He,Shiwei Shi,Renyun Zhang,Jia Cheng,Peihong Wang
Artificial intelligence-assisted wearable devices have attracted great interest in medical treatment and healthcare. However, wearable electronic devices are expensive to manufacture and usually depend on external power supply. Herein, a flexible self-powered piezoelectric sensor patch (SPP) using Polyvinylidene fluoride (PVDF) fibrous film as the functional layer is demonstrated for the assessment and motion identification of wrist joint rehabilitation training. PVDF fibrous film is prepared by a triboelectric nanogenerator (TENG)-driven near-field electrospinning system with a special designed synchronous mechanical switch. The results show that this flexible SPP has a high sensitivity of 0.2768 V KPa −1 at pressures from 1 to 75 kPa. Such excellent flexibility allows us to attach the SPP to the finger as a tactile sensor for rehabilitation assessment of wrist joint flexibility. In addition, long short-term memory network model is used to process the collected data from the SPP for motion identification. The test accuracy of the SPP wrist motion identification reaches 92.6%, which afford a potential way to understand the progress of the rehabilitation training of patients' wrists. Generally, this flexible SPP shows great promise for applications in the fields of motion monitoring, medical diagnosis and rehabilitation training based on artificial intelligence.
研究领域:
可穿戴电子
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生物医学工程
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医疗人工智能
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康复技术
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柔性传感器
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DOI
高影响因子
危险品化学品经营许可证（带存储）