ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhenji Zhou,Caiyin You,Zhong Li,Weimin Xia,Na Tian
Magnetic nanofiller is helpful for improving the piezoelectric properties of P(VDF-TrFE)-based composites, which shows promising potential as a flexible sensor or energy harvester. In this work, we use the interaction between the magnetic nanofiller and magnetic field to modify the structure of CoFe2O4 (CFO)@polydopamine (PDA)/P(VDF-TrFE) composite, in which CFO@PDA works as the nanofiller into the P(VDF-TrFE) matrix. It was found that the magnetic field orientation during polymer curing can significantly increase the content of the β-phase and d33 of the composite. Regarding a typical composite film with 7 wt % CFO@PDA, the composite exhibits versatile sensing originated from the ball impact, hot-water droplet, bending, and pressing. In a noncontact magnetic field-driven experiment, the magnetic field oriented film produced the highest output voltages of 17.4 mV at 4 Hz and 12 mV at a drive amplitude of 19 Vpp, in contrast to the values of 7.1 mV and 7 mV for the film without magnetic field orientation, respectively. The LED without any charging capacitor can be instantaneously lighted through vertically pressing the oriented films. Thus, this work proposes a strategy of magnetic field orientation to improve the piezoelectric performance of the CFO@PDA/P(VDF-TrFE) multifunctional composite film.
研究领域:
材料科学
·
传感器技术
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 3
·2501-2511
·
IF 2.324
Zhang Zhao,Yang Hui,Wang Hao,Ding Xingeng,Zhang Qilong,Zhu Zhicai
In this work, KTa 0.2 Nb 0.8 O 3 –BaTiO 3 (KTN–BT) hybrid nanoparticles were synthesized via a facile one-pot hydrothermal method. Flexible nanocomposite films comprised of poly (vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) P(VDF-TrFE-CTFE) matrix and KTN–BT hybrid fillers of different molar ratio were prepared by solution-casting. It is revealed that the introduction of BT to the KTN causes decreased grain size and homogenous morphology, improving the dielectric constant, breakdown strengthen and energy density of nanocomposite films. Typically, the nanocomposite film containing 40 vol% KTN–BT possesses a dielectric constant of 322 at 100 Hz, which is 8.7 times than that of pure polymer. Also, nanocomposite film with < 10 vol% of filler could achieve high breakdown strength of over 300 MV m −1 . The energy density of the film containing 2 vol% KTN–BT filler is 61.4% higher than that of pure P(VDF-TrFE-CTFE) polymer. (7.1 J cm −3 compared to 4.4 J cm −3 .) In addition, the nanocomposites also displayed good flexibility and kept excellent dielectric properties after bending and folding. All the improved performance enables these composites to meet the requirements of many flexible electronic devices and energy storage devices.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Jizhong Deng,Qi Sun,Zhiyi Wu,Yuanyu Wang
The self-driven flexible piezoelectric sensor has wide application prospects in areas such as health monitoring, human-machine interaction, and warning detection due to its advantages of non-toxicity and high sensitivity. In this study, a composite film of poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] doped with NaNbO 3 (NN) was prepared by electrospinning. The highly oriented NN particles promote the formation of P(VDF-TrFE) β phase, reaching a maximum β phase content of 91%. Under mechanical motion at a frequency of approximately 3 Hz, the piezoelectric nanogenerator (PENG) fabricated from the nanofiber membrane achieved a maximum piezoelectric output of 17.3 V and 12 V in the transverse and longitudinal piezoelectric responses, respectively. With an external load of 100 MΩ, the PENG obtained a maximum power density of 0.67 μW/cm². Additionally, the PENG sensor exhibited sensitivity to various human activities and demonstrated high sensitivity and rapid response in monitoring the status of the proposed door lock opening/closing, highlighting its enormous potential in security monitoring applications.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 11
·5750-5757
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IF 11.301
Liang Sun,Zhicheng Shi,Huanlei Wang,Kun Zhang,Davoud Dastan,Kai Sun,Runhua Fan
Polymer dielectric composites are of great interest as film capacitors that are widely used in pulsed power systems. For a long time, huge efforts have been devoted to achieving energy densities as high as possible to satisfy the miniaturization and high integration of electronic devices. However, the discharge efficiency which is particularly crucial to practical applications has gained little attention. With the target of achieving concurrently improved energy density and efficiency, a class of rationally designed bilayer composites consisting of a pure polyetherimide layer and a BaTiO3/P(VDF-HFP) composite layer were prepared. Interestingly, the bilayer composites exhibit ultrahigh discharge efficiencies η (>95%) under external electric fields up to 400 kV mm−1 which are much higher than most of the so far reported results (η < 80%). Meanwhile, a low loss (tan δ < 0.05 @ 10 kHz) comparable to that of the pure polyetherimide is obtained. In addition, the bilayer composites show impressive improvements in breakdown strengths Eb, i.e., 285%, 363%, 366% and 567% for composites with 5 vol%, 10 vol%, 20 vol% and 40 vol% BaTiO3, compared to their single layer counterparts, resulting in obviously improved energy densities Ud. In particular, the bilayer composite with 10 vol% BaTiO3 displays the most prominent comprehensive energy storage performance, i.e., η ∼ 96.8% @ 450 kV mm−1, Ud ∼ 6 J cm−3 @ 450 kV mm−1, tan δ ∼ 0.025 @ 10 kHz, and Eb ∼ 483.18 kV mm−1. The ultrahigh discharge efficiencies and high energy densities, along with low loss and breakdown strengths, make these bilayer composites ideal candidates for high-performance dielectric energy-storage capacitors.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 32
·e54261
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IF 3
Wei Wang,Bingnan Cheng,Wuwei Feng,Bin He,Shuo Liu
With the energy shortage and the increasing awareness of environmental protection, piezoelectric nanogenerator (PENG) has been widely studied in recent years. Polyvinylidene fluoride hexafluoropropylene (P(VDF-HFP)) is an ideal matrix material because of its piezoelectricity, flexibility, and toughness. Herein, a composite film of carbon nanotubes (CNTs), Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (BCZT), and P(VDF-HFP) (CNTs/BCZT/P(VDF-HFP)) were prepared via the tape casting method. Adding BCZT increased the polar β-phase in P(VDF-HFP), reaching a maximum when 40 wt% BCZT was incorporated. Adding CNTs to the matrix provides a conductive path inside the composite. The CNTs/BCZT/P(VDF-HFP) composite film demonstrated optimal electrical properties when 0.3 wt% CNTs is doped, with the open circuit voltage increased from 22 to 30 V and the short circuit current increased from 3 to 5.9 μA compared with the undoped sample. The output performance of the PENG was further improved with a three-layer folded structure, achieving an open circuit voltage of 40 V and a maximum power density of 31.5 mW m −2 , which easily lit six light-emitting diodes.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Jie Peng,Xiaoyu Pan,Peng Fei Hou,Bo Li
The pyroelectric-piezoelectric dual-mode sensor simultaneously decodes temperature and strain, serving as a core component for health monitoring, human-machine interfaces, and bionic skin applications. To achieve high fidelity, self-powering, and long-term endurance, the sensing materials must balance sensitivity, stability, and multi-physics field coordination across multiple scales. This study employs a synergistic strategy combining barium titanate (BaTiO3) doping with proton irradiation to regulate polyvinylidene fluoride-trifluoroethylene copolymer (P(VDF-TrFE)). By enhancing crystallinity and β-phase content of P(VDF-TrFE) while introducing oxygen vacancies and lattice distortions within the BaTiO3 lattice, the strategy significantly strengthens interfacial polarization coupling and charge transport efficiency. As a result, doping with 2wt% BaTiO3 increases pyroelectric coefficient (p) to 66.1 μC/m2•K. Although piezoelectric coefficient (d33) slightly decreases from 22.0 pC/N to 20.1 pC/N, its variation range (standard deviation) narrows from 3.9 to 3.1. Subsequent proton irradiation at 1×1010 p/cm2 further increases p to 86.6 μC/m2•K, accompanied by a slight decrease in d33. At 5×1010 p/cm2 fluence, p maintains a 6.8% increase compare to pre-irradiation levels, and d33 recovers to 20.0 pC/N with a standard deviation reduced to 2.4, effectively balancing piezoelectric uniformity and stability with high pyroelectric sensitivity. The composite film exhibits a linear sensitivity of 1.2 V/K over a temperature range of 0.1-12.2 K, with no degradation observed after 103 thermal cycles. It conformally adheres to the human body and enables real-time analysis of respiration, pulse, and touch signals, offering a novel approach for high-sensitivity, high-reliability dual-mode sensing in wearable electronics and bionic skin applications.
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DOI
高影响因子
JOURNAL OF ELECTROCERAMICS
·
2017
·Vol. 40
·期 1
·65-71
·
IF 1.238
Huang Qiao,Luo Hang,Chen Chao,Zhou Kechao,Zhang Dou
Dielectric composites are of great demand in the micro-electronics industry. To enhance the energy storage density of the composites, TiO 2 nanowire clusters was synthesized by a hydrothermal method and incorporated into the P(VDF-HFP) polymer matrix in this work. The microstructure, dielectric properties of the prepared film were discussed and the effects of TiO 2 loading on the energy density were investigated. The results shows that the TiO 2 clusters were tightly blended to the P(VDF-HFP) matrix owing to the dopamine-modified interface. The dielectric constant increased with the loading of TiO 2 , the maximum dielectric constant reached 12.04 with 7.5 vol% TiO 2 loading at 1 kHz, as compared to 5.01 for the neat P(VDF-HFP). The enhanced dielectric constant was attributed to the interface polarization originated from the large interface area between the TiO 2 nanowire and polymer matrix. The discharged energy density of the composite significantly increased to 1.35 J/cm 3 with 7.5 vol% TiO 2 nanowire clusters, which was two times higher than that of the neat P(VDF-HFP) at the same condition. The findings of this work can shed a light on improving the energy density of energy storage device via morphology modification.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 41
·24533-24541
·
IF 3.119
Huiling Chen,Yuehua Wen,Yue Wang,Songtong Zhang,Pengcheng Zhao,Hai Ming,Gaoping Cao,Jingyi Qiu
For high-voltage cycling of lithium-ion batteries, a gel polymer Li-ion conductor layer, P(VDF-HFP)/LiTFSI (PHL) with high electrochemical stability has been coated on the surfaces of as-formed LiCoO2 (LCO) cathodes by a solution-casting technique at low temperature. An LCO cathode coated with around 3 μm thickness of the PHL ultrathin membrane, retains 88.4% of its original capacity (184.3 mA h g−1) after 200 cycles in the 3.0–4.6 V range with a standard carbonate electrolyte, while the non-coated one retains only 80.4% of its original capacity (171.5 mA h g−1). The reason for the better electrochemical behaviors and high-voltage cycling is related to the distinctive characteristics of the PHL coating layer that is compact, has highly-continuous surface coverage and penetrates the bulk of LCO, forming an integrated electrode. The PHL coating layer plays the role of an ion-conductive protection barrier to inhibit side reactions between the charged LCO surface and electrolyte, reduces the dissolution of cobalt ions and maintains the structural stability of LCO. Further, the PHL coated LCO cathode is well preserved, compared to the uncoated one which is severely cracked after 200 cycles at a charging cut-off voltage of 4.6 V.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Daiyao Jiang,Tingting Wei,Kai Li,Fei Wang,Xin Sun,Jie Zhao
In this study, novel mixed matrix membranes (MMMs) composed of MoO 3 /Poly (vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) with distinctive piezo-photocatalytic properties were prepared. The membranes were made from dopes containing a high ratio of MoO 3 to P(VDF-TrFE) (2:1 wt%/wt%) through a modified solvent evaporation method. The addition of MoO 3 particles significantly impacted the crystallization and self-polarization of the P(VDF-TrFE) matrix, leading to a substantial increase in total crystallinity from 46.4% to 88.9% and a transformation from α to β phase. The flow-induced piezoelectric potential created an internal electric field, enhancing the spatial separation of photogenerated carriers through the piezoelectric effect. Controlled water flow further promoted the spatial separation of carriers. The developed MMMs demonstrated a high Rhodamine B degradation rate, reaching 83.1% within 45 minutes and over 99% within 90 minutes under natural light conditions. The MoO 3 /P(VDF-TrFE) MMMs exhibit promising piezo-photocatalytic attributes and hold potential for diverse applications due to their unique combination of piezoelectric and photocatalytic properties.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 65
·52809-52816
·
IF 3.84
Hang Luo,Dou Zhang,Lu Wang,Chao Chen,Jing Zhou,Kechao Zhou
A sandwich-structured composite consisted of a pure poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) central layer and two BaTiO3–P(VDF-HFP) neighboring layers was developed for high energy storage density. The sandwiched structure effectively enhanced dielectric properties and energy storage capacity of the composites. Breakdown strength and energy storage density of the composite with 35 vol% P(VDF-HFP) central layer reached 315 kV mm−1 and 5.22 J cm−3, which were enhanced by 68% and 125% compared to 187 kV mm−1 and 2.32 J cm−3 of the single layer composite, respectively. The dielectric constant of the composites with sandwich-structure was approximately 3 times higher than the pure P(VDF-HFP) and the dielectric loss was as low as 0.026 at 1 kHz. These results demonstrated that the sandwich-structured ceramics/polymer composite was an effective way to produce high energy density composites.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Qiuying Zhao,Lu Yang,Qirui Peng,Yizhou Ma,Hongli Ji,Jinhao Qiu
Dielectric polymer/composites films with excellent capacitive performance has initiated enormous interest from both academic and industry because of their great potential as flexible and light-weight electrostatic capacitors for modern electric and electronic systems. In this work, we report a novel flexible dielectric composite film consisting of poly (vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) and dopamine-modified metal-organic frameworks Co 3 [Co(CN) 6 ] 2 (D-M) with excellent capacitive performance for energy storage application . It is found that the D-M show good compatibility with P(VDF-HFP), permitting a high breakdown strength for composites. Meanwhile, the large specific surface area and special porous three-dimensional nanostructure of D-M also has the effect of raising dielectric performance while eliminating the inherent ferroelectric loss of P(VDF-HFP), resulting in considerably promoted discharge energy density . Furthermore, D-M is found to favor the formation of γ-phase in P(VDF-HFP), which is also advantageous to raise the discharge energy density. Upon a small loading of 0.6 wt% D-M, the composites perform a maximum discharge energy density of 11.89 J/cm 3 and discharge efficiency of 71.28% at 350 MV/m, which are 3.04 times and 1.25 times those of the pure P(VDF-HFP) film, respectively. For the first time, we demonstrate that the applicability of flexible D-M/P(VDF-HFP) dielectric composites as advanced electrostatic capacitors, providing a new sight for the design of dielectrics with high capacitive performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2016
·
IF 4.509
Chongyang Sun,Yiping Guo,Bijun Fang,Jiaming Yang,Ben Qin,Huanan Duan,Yujie Chen,Hua Li,Hezhou Liu
It is known that CH3NH3PbI3 perovskite films with high crystallization and controlled morphology always show enhanced power conversion efficiency. Here we incorporate a small amount of polyvinylidene fluoride–trifluoroethylene polymer P(VDF-TrFE) into PbI2 solution to control the crystallinity and morphology of perovskite layer in a two-step deposition process. Our results show that the P(VDF-TrFE) bridges the grain boundaries and also enhances the crystallinity of the perovskite layer significantly. By adjusting P(VDF-TrFE) concentration, the fabricated perovskite solar cells show improved average power conversion efficiency from 9.57 ± 0.25% to 12.54 ± 0.40% under a standard illumination of 100 milliwatts per square centimeter, which increases by nearly 31%. Thus, we demonstrate a new strategy to control the crystallinity and morphology of perovskite films by incorporating polymer into PbI2 film in a two-step deposition process. In addition, this method has been proven as an effective way to prepare high-performance perovskite solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
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