Nano Energy
·
2020
·
IF 16.602
Xiaoyang Guan,Bingang Xu,Jianliang Gong
Flexible piezoelectric nanogenerators (FPENGs) have attracted a great attention owing to their promising applications in harvesting mechanical energy and driving portable devices. To develop high-performance FPENGs, the significant relationship among material, structure and performance inspired us a rational design of FPENGs from Pdop-BaTiO 3 @P(VDF-TrFE) nanocomposite fiber mats with a hierarchically architected microstructure. In contrast with previous approaches, the polydopamine (Pdop) modified barium titanate (BaTiO 3 , BT) nanoparticles have been anchored onto the surface of electrospun poly (vinylidene fluoride-trifluoroethylene) P(VDF-TrFE) fibers to fabricate hierarchical micro-structured membrane in this study, which not only effectively avoids the agglomeration of nanofillers but also enhances the density of interfaces in the nanocomposites. As a result, the as-fabricated FPENGs show a significantly enhanced output of 6 V and 1.5 μA as compared to the PENG with only P(VDF-TrFE) membrane (1.25 V and 0.6 μA). Furthermore, output voltage of the new FPENGs is 40%–68% higher than that of composite membranes with nanoparticles at the interior of nanofibers . The improved output of the PENG is attributed to the high density of interfaces in the hierarchical microstructure and the corresponding enhancement of dielectric response. Then, electric performance of FPENGs was investigated in terms of force, frequency and load resistance. Finally, the FPENG was employed to efficiently detect human body movements as self-powered sensors. The hierarchical nanocomposite membrane designed in this study provides an effective approach for developing mechanical energy harvesters , wearable sensor network and self-powered devices.
研究领域:
材料科学
·
能源技术
·
传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF FLUORINE CHEMISTRY
·
2017
·
IF 2.101
Donghan Li,Mingyi Liao
This study evaluates the dehydrofluorination mechanism, structure and thermal stability of pure fluoroelastomer which was dissolved by organic solvent and reacted with different concentrations of KOH at 20 ∼ 60 °C. The sequence types and contents of double bonds and other oxygen-containing groups of samples were analyzed and investigated by Attenuated total reflectance/Fourier transform infrared (ATR-FTIR), 1 H nuclear magnetic resonance (NMR), 19 F-NMR spectroscopy and chemical titration method; thermal decomposition temperatures of samples were analyzed by thermogravimetric analysis (TGA). The results revealed that dehydrofluorination of fluoroelastomer would accompain with oxidation reaction whereby some double bonds conforming to Hofmann’s rule had been converted to hydroxyl groups, wherein the temperature and alkali concentration were the important factors. The double bonds generated in seven positions of molecular chains, sequence types were mainly conformed to Hofmann’s rule and Zaitsev’s rule supplemented. With the increase of reaction temperature and concentration of KOH, the thermal stability of fluoroelastomer decreased obviously since hydroxyl groups had a greater effect on it. Finally, the mechanism of reaction was also deduced.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 13
·6070-6078
·
IF 8.867
Bing Xie,Haibo Zhang,Qi Zhang,Jiadong Zang,Chao Yang,Qingping Wang,Ming-Yu Li,Shenglin Jiang
In practical application, new dielectric capacitors with greater energy density at lower operating voltage will be promising candidates for high-performance electrical devices. Theoretically, it is possible to achieve large electric polarization at a low electric field via embedding aligned ferroelectric nanowires in a polymer matrix, which could release high energy density. However, in terms of practice, the design of nanocomposites with aligned nanowires poses a great technical challenge. Here, a new physical-assisted casting method was developed to tune the orientation of elongated BaTiO3 nanowires in a P(VDF-CTFE) matrix. In the Z-aligned nanocomposites, a large (Dmax − Pr) value of 9.93 μC cm−2 can be induced at a low electric field of 2400 kV cm−1 by aligning 3 vol% ferroelectric BaTiO3 nanowires in the poling direction. Compared with X–Y-aligned nanocomposites even at a high electric field of 3400 kV cm−1, the Z-aligned nanocomposites could exhibit simultaneously an enhanced energy density of 10.8 J cm−3 and a discharge efficiency of 61.4% at 2400 kV cm−1. To the best of our knowledge, among ferroelectric nanocomposites, this is the highest energy density ever obtained at such a low electric field. This work is of critical significance in making dielectric nanocomposites viable for energy storage devices in current electrical and electronic applications.
研究领域:
材料科学
·
电气工程
·
纳米技术
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DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 30
·10257-10265
·
IF 7.059
Liang Sun,Zhicheng Shi,Liang Liang,Shuang Wei,Huanlei Wang,Davoud Dastan,Kai Sun,Runhua Fan
Polymer dielectric composites are of considerable interest for film capacitors that are widely used in modern electric devices and electric power systems. However, the adverse coupling between dielectric permittivity (εr) and breakdown strength (Eb) makes it difficult to obtain high energy densities in natural materials. With the aim of achieving concurrently improved εr and Eb, a class of rationally designed layer-structured composites consisting of pure poly(vinylidene fluoride–hexafluoropropylene) (P(VDF–HFP)) layers and barium titanate/P(VDF–HFP) (BT/P(VDF–HFP)) composite layers were prepared. Interestingly, the layer-structured composites exhibit a concurrent improvement of εr and Eb. The 4-layer composite with 15 vol% BT exhibits substantially enhanced εr and Eb which are nearly ∼186% and ∼248% of those for its 1-layer counterpart, respectively. Consequently, a high energy density of ∼4 J cm−3 along with a satisfactory efficiency of 71% at 240 kV mm−1 is achieved. Meanwhile, a low loss tangent of ∼0.05 at 10 kHz which is comparable to that of pure P(VDF–HFP) is maintained. This work shows that the adverse coupling between εr and Eb in dielectric materials could be well addressed by constructing nanocomposites with layered rather than random distribution of fillers.
研究领域:
材料科学
·
电气工程
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DOI
高影响因子
LANGMUIR
·
2026
·
IF 4.4
Changning Ran,Yizhou Liang,Boyu Li,Yuhan Xing,Xi Chen,Chuanyezi Cai,Jiacheng Guo,Gengqi Tong,Jichen Sun,Youyuan Zheng,Huimin Liao,Jianjun Zhang
Poly(vinylidene fluoride) (PVDF)-based ferroelectrics are essential for film capacitors, yet their high dielectric loss and low charge/discharge efficiency caused by ferroelectric hysteresis severely limit practical applications. Linear polypropylene (PP), in contrast, dominates the commercial capacitor market due to its high efficiency and low loss, prompting extensive efforts to combine the advantages of both polymers. However, existing approaches often rely on costly molecular design or complex film-forming processes, conflicting with the demands for low-cost and miniaturized electronic devices. Here, we report a solution-based and scalable strategy that avoids high-temperature melt processing to fabricate a hybrid dielectric film comprising a P(VDF-HFP) matrix, embedded PP chain segments, and core–shell structured BT@SiO2 nanoparticles. Polypropylene chain segments are embedded into the poly(vinylidene fluoride-co-hexafluoropropylene) [P(VDF-HFP)] matrix via solution blending, forming molecularly interpenetrating interfaces that effectively suppress ferroelectric hysteresis. Core–shell structured BT@SiO2 nanoparticles are simultaneously incorporated to further enhance dielectric properties. The resulting P(VDF-HFP)-PP/BT@SiO2 nanocomposite films exhibit a high dielectric constant of 46, a charge/discharge efficiency consistently exceeding 80%, and a maximum energy density of 3.92 J/cm3. Phase-field simulations further reveal that the P(VDF-HFP)-PP/BT@SiO2 architecture with graded dielectric constants mitigates local electric field concentration, accounting for the excellent breakdown performance. Unlike conventional high-temperature melt processing or complex molecular design, this work offers a low-cost and scalable route that avoids high-temperature melt processing to high-performance polymer dielectrics, demonstrating that combining molecular interpenetration with core–shell filler engineering provides a promising pathway for next-generation capacitors.
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DOI
PubMed
高影响因子
ACS Omega
·
2026
·
IF 5.2
Xuan Liu,Liangliang Chang,Aiguo He,Zengzhe Xi,Chunsheng Zhou,Baoyue Cao
The persistence of fluoroquinolone antibiotics like OFL in aquatic environments poses a significant ecological and public health risk due to their poor biodegradability and potential to induce antibiotic resistance. This study reports the fabrication of free-standing, flexible nanofibrous films via electrospinning, incorporating optimal BGFZ9 nanoparticles into a P(VDF-HFP) matrix (denoted as P(VDF-HFP)@BGFZ9). Comprehensive characterization reveals that the BGFZ9 nanoparticles act as effective heterogeneous nucleating agents, significantly promoting the formation of piezoelectric β-phase in P(VDF-HFP) and enhancing the ferroelectric polarization of the composite through interfacial coupling. Under ultrasonic excitation, the composite film exhibits remarkable piezocatalytic performance for OFL degradation, following pseudo-first-order kinetics. The film with an optimal 10% BGFZ9 loading achieves a reaction rate constant of 0.684 min–1·g–1 under piezocatalysis, which is approximately 1.22 times higher than that of the pure polymer film. A synergistic piezophotocatalytic effect is observed under combined ultrasonic and light irradiation, leading to an OFL removal efficiency of 85.71% within 3 h and a further increased rate constant of 1.043 min–1·g–1. Radical scavenger experiments and EPR spectroscopy identify superoxide radicals •O2– and h+ as the primary reactive species responsible for the degradation. The composite film demonstrates excellent cycling stability, retaining 94.4% of its initial activity after five consecutive runs, alongside robust structural integrity. This work provides a novel strategy for developing efficient, stable, and easily recyclable flexible piezocatalytic materials for antibiotic wastewater remediation.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xinyu Wang,Rui Yang,Peng Lu,Jiabao Wang,Chunhua Lu,Kai Guo,Ning Zhu,Xin Hu
To meet the growing requirement for highly integrated electronic systems, nanocomposites comprised high dielectric constant ( ε ) ceramic nanofillers and large dielectric breakdown strength ( E b ) polymer has been widely investigated for high energy density capacitor. However, the poor interfacial compatibility arising from the great difference of surface energies and ε values usually resulted to the sacrifice of the dielectric properties and thus the capacitive performance. In this work, a series of core-shell structured barium titanate (BaTiO 3 ) nanofillers were designed and prepared to address this challenge via surface-initiated atom transfer radical polymerization (SI-ATRP) of methyl methacrylate (MMA), ethyl methacrylate (EMA) and glycidyl methacrylate (GMA). BaTiO 3 @PMMA (BT@M), BaTiO 3 @PEMA (BT@E), BaTiO 3 @PGMA (BT@G) were fabricated and incorporated into poly (vinylidene fluoride- co -hexafluoropropylene) (P(VDF-HFP), PVH), respectively. Enhanced dielectric properties, E b , and energy storage density were observed in these nanocomposites comparing with nanocomposites of BT/PVH. It should be ascribed to the polymer shell layer alleviated the great surface energy and ε value disparity between BT filler and PVH matrix, which was responsible for the enhancement of the interfacial compatibility and homogenous distribution of electric fields. Among these three types of nanocomposites, PVH/BT@G exhibited superior dielectric properties and capacitive performance. Extraordinary advances in charge carrier suppression at elevating temperature and electric field were also witnessed in PVH/BT@G. It should be attributed to the polar PGMA layer served as the deep traps, which block the charge motion in the filler-matrix interfaces. At optimal conditions, energy density of 10.61 J cm −3 and efficiency of 65.7 % at 360 MV m −1 was achieved. This work may provide insight into the rational design of the shell layer of the fillers for polymer nanocomposites dielectrics.
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DOI
高影响因子
ACS Applied Electronic Materials
·
2022
·
IF 4.494
Shuimiao Xia,Kuan Chen,Kelan Yan,Liming Shen,Meiyu Zhang,Zhicheng Shi,Runhua Fan
Polymer dielectric composites are extensively used in modern electronic devices because of their extremely high power density. However, unfavorable coupling between breakdown strength and dielectric permittivity can make achieving high energy density a challenge. In this study, reduced graphene oxide @ barium titanate (RGO@BTO) hybrid nanosheets have been fabricated and utilized as fillers in the design of RGO@BTO/P(VDF-HFP) single-layer films. An increase in permittivity to 24.8@10 kHz, i.e., equivalent to 253% of the P(VDF-HFP) (∼9.8@10 kHz) matrix, has been achieved with only 1 wt % RGO@BTO nanofillers due to the formation of microcapacitors. Furthermore, the RGO@BTO/P(VDF-HFP) film is hot-pressed with a PEI film and a P(VDF-HFP) film, forming a trilayer structure. Consequently, this trilayer film displays a high breakdown strength of 478 kV/mm, a high energy density of 8.25 J/cm3, and a satisfactory efficiency of 64.3%. Thus, this study provides an efficient route for designing polymer composites that combine high energy density with high permittivity.
研究领域:
材料科学
·
电气工程
·
纳米技术
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 8
·975-983
·
IF 3.603
Li Hui-Xian,Hou Lei,Wu Pei-Yi
The time-resolved attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy is employed to investigate the transport mechanism of gel electrolytes by monitoring the diffusion behavior of propylene carbonate-lithium bis(trifluoromethylsulfonyl)imide (PC-LiTFSI) solution through poly(vinylidene fluoride- co -hexafluoropropylene) (P(VDF-HFP)) films. Fickian behavior has been observed for both TFSI − and PC. Higher temperature leads to faster diffusion of TFSI − and PC, which could be related to the increased free volume in P(VDF-HFP) matrix and rapid molecular movements upon heating. Various molecular interactions among LiTFSI, PC and P(VDF-HFP) have been recognized. During the diffusion process, PC molecules, in the form of small clusters, can firstly diffuse through the P(VDF-HFP) film and interact with P(VDF-HFP) by dipole-dipole interaction, acting as the plasticizer. Then, Li + diffuses into P(VDF-HFP) with the help of ion-dipole interactions between Li + and C-O of PC. Meanwhile, TFSI − diffuses through the polymer matrix in solvation states. In addition, slight ion-dipole interactions between Li + and P(VDF-HFP) have been observed as well. Results in this work contribute to a better understanding of transport process in gel polymer electrolytes for lithium-ion batteries and support the development of improved gel polymer electrolytes by rationally regulating molecular interactions.
研究领域:
高分子化学
·
电化学
·
能源材料
·
锂离子电池
·
光谱分析
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 20
·1565
·
IF 3.2
Yang Bowen,Zhang Siqi,Guan Mengxiang,Liu Lei,Yan Ziyu,Liang Yongri,Peng Guirong,Zhou Zhe
Owing to the outstanding ferroelectric properties, PVDF and its copolymers have emerged as the most promising piezoelectric polymer materials to date. To enhance the dielectric constant of P(VDF-HFP) while reducing its dielectric loss, BT@C@SiO 2 with a double-layer shell structure was synthesized and blended with P(VDF-HFP) to fabricate a piezoelectric film. Under mild conditions, PDA was synthesized as the precursor of the conductive carbon inner shell, which was carried out in a weakly alkaline Tris buffer system at room temperature, only involving stirring, centrifugation, water washing, and low-temperature drying, without any drastic reaction procedures. The results demonstrated that the incorporation of BT increased the dielectric constant of the film, whereas the introduction of the C layer formed micro-capacitors within the matrix, further enhancing the dielectric constant. Simultaneously, the C layer with high defect density captured freely mobile carriers in the film, thereby reducing AC conductivity and dielectric loss, which improved the energy harvesting efficiency of the piezoelectric film. The dielectric constant of the BT@C@SiO 2 /P(VDF-HFP) film could reach up to 15.8 (100 Hz), while the dielectric loss and conductivity were as low as 0.042 and 3.77 × 10 –9 S/m (100 Hz), respectively. The BT@C@SiO 2 acted as a nucleating agent in the P(VDF-HFP) matrix, and consequently induced the increase of the crystallization temperature and the formation of β phase in P(VDF-HFP). When the BT@C@SiO 2 content reached 5%, under a pressure of 40 N and a loaded resistance of 10 6 Ω, the composite film achieved its highest piezoelectric output with the output voltage of 1.1 V. Under a pressure of 40 N and a loaded resistance of 10 11 Ω, the piezoelectric output power reached its maximum value of 8.76 μW. A 5% BT@C@SiO 2 /P(VDF-HFP) film was fabricated into a piezoelectric sensor for practical applications. The output voltages of the film during finger bending, finger tapping and foot stepping were 0.40 V, 0.75 V, and 2.65 V, respectively. These results indicated that BT@C@SiO 2 /P(VDF-HFP) piezoelectric film exhibited potential application in motion monitoring.
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DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 33
·2405024
·
IF 27.4
Mingsheng Gao,Xiangqian Lu,Yuying Yang,Wei Qin
Organic multiferroic heterostructure is one of the most promising structures for the future design of high-density flexible energy-efficient data storage. Here, organic ferromagnetic metal(tetracyanoethylene) (M(TCNE)) x /ferroelectric poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) multiferroic heterostructures are fabricated, where the excited state in M(TCNE) x interacted with localized dipole in P(VDF-TrFE) provides a key link for the interfacial coupling. Thus, aligned dipoles in P(VDF-TrFE) by external electric field can affect the magnetization of Fe(TCNE) x effectively to result in a pronounced magnetization–voltage ( M – V ) hysteresis loop. Moreover, light-induced electron-hole pairs in Fe(TCNE) x with long lifetime effectively interact with the dipoles in P(VDF-TrFE) to lead to an effect in external light control of electric polarization of P(VDF-TrFE). Overall, the organic multiferroic heterostructure provides the possibility of realizing two storage modes, light control of dipole as well as electric field control of spin, which can broaden multifunctional applications of organic multiferroic materials in the area of multistate storage.
研究领域:
材料科学
·
物理学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Sijia Miao,Zhaoyue Yang,Yujian Du,Yuljae Cho
Incorporation of ferroelectric materials into perovskite solar cells (PSCs) has been demonstrated as an effective approach to elevating the device performance. Dipole polarization of the ferroelectric material can be tuned by an external bias, facilitating the charge transport of PSCs. However, fundamental challenges still exist to utilize the ferroelectric effect in PSCs because the external bias leads to ion migration of the perovskites, deteriorating the performance and long-term stability of the devices. In this study, we report an effective method to improve the spontaneous polarization of the ferroelectric polymer incorporated in a quasi-two-dimensional (2D) perovskite without utilizing the external bias. The solvent engineering strategy effectively enhances the ferroelectric phase and crystallinity of the ferroelectric polymer, improving the local electric field and consequently enhancing charge transport. In addition, the solvent strategy offers the formation of a smooth surface as well as a favorable crystal orientation, leading to a reduced defect density in the quasi-2D perovskite films. Attributed to the dual effects, a significant improvement of the power conversion efficiency is achieved from 6.27 to 14.83%, and it is further improved to 16.65% through fine-tuning of the functional layers’ thickness. We believe that the method reported offers an avenue for designing the quasi-2D perovskite without the requirement for structural modification of the PSCs.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
PubMed
高影响因子
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