Materials Research Express
·
2020
·Vol. 7
·期 1
·016437
·
IF 1.929
Linchen Liao,Caifeng Chen,Jilong Qian,Youming Zhang,Ruifang Zhang,Jiaguang Zhu
PVDF/IL piezoelectric film based on [Emim]BF4-added was prepared by near electric field direct writing. The β-phase content and its electric property of the film were analyzed. The results showed that the content of β crystal phase of PVDF film was improved by the synergistic effect of IL ([Emim]BF4) and near electric field. When the amount of [Emim]BF4 added was 1.5 wt%, the relative β-phase content of PVDF film reached 85.09%, and the crystallinity is 47.84%. Increase in [Emim]BF4 content resulted in a significant increase in the relative dielectric constant of the film, from 6 to 285, but also accompanied by a sharp increase in dielectric loss. The d33 value of the film can be as high as −10 pC/N, and the output voltage from the cantilever beam vibration feedback indicates that the voltage strength of the [Emim]BF4-added film is greatly improved compared with the pure PVDF film.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Zheng Zhou,Xiangxin Du,Jikui Luo,Liqin Yao,Zhao Zhang,Hui Yang,Qilong Zhang
Piezoelectric polyvinylidene fluoride (PVDF) and its copolymer based piezoelectric nanogenerators (PENGs) have attracted extensive attention, which can hopefully be applied in the fields of wearable electric devices and sensing systems. However, one great challenge that limits their large-scale application is to achieve PVDF based composites with high piezoelectric performance. Herein, a facile and efficient method is proposed to develop translucent, porous composites with high β phase content and abundant micropores . Enhanced β phase formation is attributed to the electrostatic bonding between fillers (ZnO nanoparticles and Ag nanowires) and -CH 2 and -CF 2 chains, yet, local conformational disorder at the ZnO-matrix interface region caused by strong interface effect results in local stabilization of β phase. Coupling of high β phase content and microporous structure is believed to be essential for achieving considerable piezoelectric outputs (7.1 μW/cm 2 ) and excellent force sensitivity (1.155 V/kPa). In practical applications, the composites based PENGs can efficiently harvest mechanical energy from human motions and detect weak physiological signals. Furthermore, a 3 × 2 pixel tactile sensor array is integrated successfully to work as self-powered flexible coded lock without power supply. Our work offers a simple approach to high-performance piezoelectric composites and moves a step toward sensing application.
研究领域:
材料科学
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能源技术
·
传感器技术
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Li Song,Ruixian Dai,Yijun Li,Qi Wang,Chuhong Zhang
As an effective way of power-to-electricity conversion, piezoelectric energy harvesters have received extensive attention in the past decade. However, the relationship between output performance and the topological structure of piezoelectric devices is still unknown. In this study, a simple and fast in-situ chemical foaming assisted fused deposited modeling (FDM) method was developed, and complex three-dimensional (3D) bioinspired bone structures of polyvinylidene fluoride (PVDF) were successfully fabricated. The hierarchical porous structure couples advantages of arbitrary shape design by 3D printing and abundant inner pores inside the printed piezoelectric parts that amplify the stress–strain effect and improve the output capacity. Moreover, with the assistance of ionic liquid, high β-phase content (86.72%) PVDF was achieved, producing an output of ∼13 V and a maximum current density of ∼0.27 μA/cm2, which outperforms most of the PVDF piezoelectric energy harvesters reported so far. Impressively, the as-prepared PVDF device can directly light up eight green LED bulbs and charge a 1 μF commercial capacitor to 3.65 V within 300 s. This work highlights a new 3D printing strategy integrated with a 3D biomimetic structural design for high-performance piezoelectric energy harvesting.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
npj Flexible Electronics
·
2025
·Vol. 9
·期 1
·1-13
·
IF 15.5
Hazarika Dinku,Lu Jiaqi,Wu Jianhui,Shah Muhammad Naeem,Li Jie,Zhang Kaihang,Xu Liangquan,Chen Chuanrui,Cao Zhen,Jin Hao,Dong Shurong,Huang Yuhui,Zhang Qilong,Wu Yongjun,Luo Jikui
Organic piezoelectric materials have attracted significant interest for applications in sensing, energy harvesting, and flexible electronics. However, its piezoelectric properties are yet to be improved. This study introduces a facile strategy to fabricate homogenous and dense polyvinylidene fluoride (PVDF) films with high piezoelectric performance via anhydrous CaCl 2 doping. The strong ion–dipole interaction between Ca 2+ and F atoms, along with directional dipole alignment under an electric field at elevated temperature, as verified by molecular dynamics simulations and material characterizations. This results in an impressive β -phase content of 92.78% and a piezoelectric coefficient of 29.26 pm/V. A piezoelectric device fabricated from this PVDF film delivers an output voltage exceeding 12 V under external pressure and maintains stability over 60,000 cycles. When integrated with an LC resonant circuit, it functions as a wireless sensor for real-time motion monitoring. This scalable approach significantly advances piezoelectric polymer performance for practical applications.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
H.Z. Li,W.Z. Li,Y.J. Yang,H.L. Tai,X.S. Du,R.Y. Gao,S.Y. Li
Pyroelectric properties of 1–3 ceramic/polyvinylidene fluoride (PVDF) composites by using barium titanate nanowires (BTnws) and dopamine modified BTnws (DM-BTnws) as inclusions were firstly reported. 0–3 composites based on dopamine modified BT nanoparticles (DM-BTnps)/PVDF were also prepared for comparison. It was found that low contents of DM-BTnws in PVDF are beneficial for achieving high fraction of β-phase content based on the analysis results of X-ray diffraction (XRD), Fourier transform infrared (FTIR) and electric displacement-electric field ( D-E ) measurements. The enhancement of β-phase content in the DM-BTnws/composited film was believed to originate from strong hydrogen bonds interactions between poly-dopamine and PVDF molecules, which induced phase transition in PVDF from α-phase into β-phase. However, although DM-BTnws improved β-phase content and, accordingly, pyroelectric coefficient of the composites, they deteriorated dielectric performances of PVDF, reducing pyroelectric performances of the composites in terms of voltage and detectivity figures of merit.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Central South University
·
2025
·Vol. 32
·期 1
·71-81
·
IF 4.4
Zhou Run-kai,Yang Hong,Peng Chao-qun,Wang Ri-chu,Zhang Dou,Fang Guang-qiang,Wang Xiao-feng
Polyvinylidene fluoride/lead zirconate titanate (PVDF/PZT) composite films have been prepared by direct ink writing and the effect of PZT content on crystallization behavior and electrical properties of film were systematically investigated. The composite films were characterized by scanning electron microscope (SEM), X-ray diffractometer (XRD), Flourier transform infrared spectroscope (FTIR) and differential scanning calorimeter (DSC). The results show that, surface modified PZT powder (PZT@PDA) is successfully coated by polydopamine (PDA), resulting in a large number of polar groups that interact with the —CF 2 — groups in PVDF, inducing the generation of polar β phase due to hydrogen bonding formed in the interaction. The β phase content in composite film increases with increasing PZT@PDA content, up to 28.09% as with 5 wt.% PZT@PDA. PZT@PDA plays a role of nucleating agent to promote the generation of polar phases in the film and also acts as an impurity hindering the growth of nuclei to reduce crystallinity. Moreover, the presence of PZT@PDA in interfaces provides more sites for the occurrence of interfacial polarization and thus improving the electrical properties of films. The composite film with 5 wt.% PZT@PDA possesses the highest dielectric constant (8.61) and residual polarization value (0.6803 µC/cm 2 ).
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
Advanced Energy and Sustainability Research
·
2024
·
IF 6.2
Jiaqi Lu,Kaihang Zhang,Dinku Hazarika,Liangquan Xu,Jie Li,Jianhui Wu,Muhammad Naeem Shah,Hao Jin,Shurong Dong,Yuhui Huang,Qilong Zhang,Yongjun Wu,Jikui Luo
Polyvinylidene fluoride (PVDF) and its copolymers present extensive application prospects, especially in the field of wearable electronics. However, utilizing nanofillers for enhanced β-phase and piezoelectric properties faces challenges like noncontinuous interfaces, poor compatibility between nanofillers and PVDF matrix, and the requirement of high-voltage polarization, hindering extensive domain alignment on a large scale. Herein, a method is proposed to synthesize high-performance PVDF composites by introducing hydroxylated barium titanate (H@BTO) nanoparticles and a directional freeze-drying method to enhance β-phase content and piezoelectric properties without polarization. Molecular dynamics simulations reveal robust binding interactions between Ba and F atoms along with OH surface terminations on H@BTO, facilitating hydrogen bonding within the PVDF matrix, resulting in dipole alignment and increased spontaneous polarization. The composite film achieves an 86.69% β phase content and a piezoelectric coefficient of ≈14.49 pm V −1 without electric polarization. The freeze-drying PVDF-H@BTO composite film paired with a PA6 membrane is used to fabricate triboelectric nanogenerator, demonstrating a current density of ≈107.5 mA m − 2 and an output voltage of ≈832 V. Results demonstrate that the utilization of strong binding interactions between various atoms, the hydroxyl anchoring effect, and directional freeze-drying method as a strategy holds promising prospects for synthesizing high-performance piezoelectric composites.
研究领域:
材料科学
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纳米技术
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Bo Li,Bin Yang,Xinchen Cai,Shu Zheng,Fang Wang,Chuanlai Ren,Hongxia Guo,Qianjin Wang,Weishu Liu
Polyvinylidene fluoride (PVDF) and its copolymers have garnered significant interest for flexible and wearable sensors. However, the sensitivity of PVDF-based sensors is limited by their relatively low pyroelectric properties compared to those of inorganic ferroelectric materials. In this study, we report on poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) films exposed to x-ray irradiation to increase the crystallinity and β-phase content. This increase in crystallinity and β-phase content ultimately improved the pyroelectric coefficient (150.9 μC m −2 K −1 ) by almost more than five times. The sensors, based on the irradiated P(VDF-TrFE) films, showed an outstanding thermal voltage sensitivity of 15.07 V K −1 and a current sensitivity of 12.19 nA K −1 . The sensors exhibited excellent linear temperature sensing and a precision infrared detector, making them promising candidates for self-powered electronic skin in human-machine interaction applications.
研究领域:
高分子材料科学
·
柔性电子学
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生物医学工程
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传感器技术
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智能可穿戴设备
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热电材料
·
人机交互
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2024
·
IF 5.8
Haitao Li,Yingying Zhang,Han Dai,Veronica Pereir,Junfeng Zhao,Hiang Kwee Lee
Polyvinylidene fluoride (PVDF)-based piezoelectric catalysts show promise in mechanical force-driven catalysis due to their good biocompatibility, flexibility, and ease of fabrication. However, the catalytic activity of pristine PVDF is limited due to its low piezoelectric phase content (<20%), poor orientation, and low surface carrier concentration. Here, we introduce an efficient PVDF-based composite nano-catalyst (rGO/PVDF) with high piezoelectric catalytic performance. We achieve this by employing a composite strategy that combines nanoscale water-induced polarization with polar functional group-modified graphene (rGO) serving as a nanoelectrode. The nanoscale water polarization effect, together with the two-dimensional planar structure of PVDF and the modified graphene's polar functional groups, effectively induces orientation in the PVDF piezoelectric phase to increase the functional β phase content. As a result, the β phase content and crystallinity of rGO/PVDF reach 95% and 40%, respectively, which are 600% and 170% higher compared to those of pristine PVDF. This enhancement plays a crucial role in endowing the material with strong force-to-electricity conversion characteristics. Additionally, the surface-modified rGO also boosts PVDF's surface carrier concentration and provides active sites for catalysis on the rGO/PVDF composite. Notably, under optimized conditions, our catalyst achieves a ∼99.1% degradation rate of organic pollutants (10 mg L−1) after 12 minutes of sonication at 240 W and maintains a high efficiency of ∼93.7% even at a 10 times higher pollutant concentration (100 mg L−1). Our piezoelectric catalyst also demonstrates efficient H2O2 production at 95.8 mmol grGO−1 h−1, which is ∼9-fold and ∼134-fold higher than those of untreated PVDF and previously reported PVDF-based piezoelectric catalysts, respectively. This work paves the way for the development of highly efficient PVDF-based piezoelectric catalysts, thereby offering valuable insights for the advancement of mechanically driven catalysis in the environmental, energy, and chemical sectors.
研究领域:
材料科学
·
环境科学
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yingying Zhang,Carice Chong,Wangshu Tong,Haitao Li,Hiang Kwee Lee,Jie Han
Polyvinylidene fluoride (PVDF) is promising for piezo-catalytic applications owing to its excellent biocompatibility, flexibility, and durability. However, it is limited by weak electroactivity originating from its intrinsically low β piezoelectric phase content (<20%) and insulating properties. Here, we achieve efficient piezo-catalysis by introducing a self-polarized PVDF-based composite containing carbon nanotube (CNT) as conductive fillers. Notably, our self-polarized CNT/PVDF (SCP) ensemble exhibits a high β phase content of ∼95%, which is up to 6-fold higher than the original PVDF powder, and superior electrical activity by exploiting the polarity induction effect of water molecules. As a proof-of-concept demonstration, the SCP realizes efficient degradation of organic-polluted water by at least 95% within 2 h of ultrasonication (240 W), even at high pollutant concentration (40 mgL −1 ). Systematic investigations unveil its excellent recyclability and adaptability to various tropical or subtropical natural waters. More importantly, the SCP also achieves efficient H 2 O 2 production of up to ∼13.5 mmol g CNT −1 h −1 , which is > 6-fold and > 19-fold better than standalone self-polarized PVDF (i.e., without CNT content) and emerging piezo-catalytic designs, respectively. This study offers a unique approach for designing PVDF-based piezo-catalyst to expedite mechanically-driven catalysis towards practical applications.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）