JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Sisi Chen,Siyi Chen,Jiali Lan,Hongxiang Qin,Shuang Yang,Pan Wang,Yong You
In this work, a novel nanoparticle ((MoS 2- BT)@ (PDA+PEI)) was constructed through two-dimensional molybdenum disulfide (MoS 2 ) and zero-dimensional barium titanate (BT) via in-situ polymerization and co-modification of polydopamine (PDA) and polyethylenimine (PEI). Then the nanofillers were dispersed in the Polyarylene ether nitrile (PEN) matrix by film casting to obtain PEN/(MoS 2 -BT)@ (PDA+PEI) nanocomposite dielectric films. Subsequently, the latter were subjected to chemical crosslinking at high temperature to obtain CPEN/(MoS 2 -BT)@ (PDA+PEI) nanocomposites. The effects of filler content on the properties of PEN matrix composite films were investigated. The results indicate excellent compatibility between (MoS 2 -BT)@ (PDA+PEI) and the PEN matrix due to the introduction of an organic modification layer, resulting in overall good performance of nanocomposite films , including good thermal stability with a glass transition temperature ( T g ) exceeding 240 °C after chemical crosslinking. The dielectric constant of CPEN nanocomposites containing 40 wt% of the hybrid nanoparticles is 20.2 and the dielectric loss is 0.032 at 1 kHz, the dielectric constant-temperature coefficient of all CPEN nanocomposites is less than 6 × 10 −4 °C −1 at the temperature range of 25–220 °C. In short, the incorporation of (MoS 2 -BT)@ (PDA+PEI) effectively enhances the thermal, mechanical, and dielectric properties of PEN-based nanocomposites.
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高影响因子
PLASMA SCIENCE & TECHNOLOGY
·
2020
·Vol. 22
·期 4
·044003
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IF 1.358
Chenyuan TENG,Wenjun ZHOU,Yuanxiang ZHOU,Ling ZHANG,Yunxiao ZHANG,Zhongliu ZHOU,Wenpeng LI
The DC electrical resistivity-temperature characteristic is an important property for insulating materials to operate at a high stress level. In order to improve the DC electrical resistivity at elevated temperature in a targeted way, a positive temperature coefficient (PTC) material (BaTiO3-based compound (BT60)) was selected as the filler in this paper, whose electrical resistivity has a PTC effect when the temperature exceeds its Curie temperature. The BT60 was treated with hydrogen peroxide and (3-Aminopropyl) triethoxysilane. Epoxy composites with different loadings of BT60 fillers (0 wt%, 0.5 wt%, and 2 wt% of epoxy) were prepared, denoted as EP-0, EP-0.5, and EP-2. It was shown that BT60 was able to maintain the DC breakdown strength when its loading was less than 2 wt% of epoxy. As the temperature exceeds 60 °C, BT60 will compensate for the negative temperature coefficient effect of epoxy resin to some extent. The electrical resistivity of EP-2 was improved by 55% compared with that of neat epoxy at 90 °C. It was found that the potential barrier at the grain boundary of BT60 and the deep traps in the interface between BT60 and the epoxy resin hinder the migration of carriers and thus increase the electrical resistivity of epoxy composite.
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高影响因子
Nano Energy
·
2019
·
IF 15.548
Xianwen Liang,Xuecheng Yu,Lulu Lv,Tao Zhao,Suibin Luo,Shuhui Yu,Rong Sun,Ching-Ping Wong,Pengli Zhu
Polymer-based materials with superb dielectric properties and energy storage performance are of essential significance in today's numerous electronic and electrical power systems. Herein, BaTiO 3 internally decorated hollow porous carbon (BT@HPC) hybrids are prepared via a unique combination of surfactant-free method and sol-gel, which are utilized as the fillers in the two outer layers of a sandwich-structured polymer composite with neat polyvinylidene fluoride (PVDF) as the central layer. Significantly improved permittivity approaches 39 (1 kHz) for the sandwich-structured composite with a low filler content of 7 wt% (~6.02 vol%) attributing to plentiful interfacial space charge polarizations (SCPs) and sophisticated microcapacitor networks constructed by BT@HPCs, while the dielectric loss still retains a low value of 0.03 owing to suppressed carrier transportation by the interfacial obstruction between adjacent layers in this hierarchical architecture. Also, enhanced energy storage density of 10.2 J/cm 3 with a high charge-discharge efficiency of 77% is achieved in the sandwich-structured composite with 1 wt% (~0.85 vol%) BT@HPC under a relative low applied electric field of 360 MV/m, to which interfacial barrier effect and redistribution of local electric field in the multilayer configuration make vital contributions. This work broadens the avenue to reinforce performance of polymer dielectrics for capacitive energy storage applications by designing specific structured particles as fillers in hierarchical architecture composite.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yefeng Feng,Qihuang Deng,Cheng Peng,Qin Wu
Although high permittivity is achieved in barium titanate (BT) filled polymer nanocomposites , severely reduced insulation and breakdown properties are frequently found due to overload and agglomeration of BT nanoparticles with ultrahigh specific area. To simultaneously realize high permittivity and breakdown strength , in this work, unfunctionalized 2D Ti 3 C 2 MXene nanosheets with 2 wt% weight concentration were introduced to prepare ternary BT/MXene/polymer nanocomposites by solution cast process. Employing low-concentration conductive MXene instead of high-concentration ferroelectric BT could lead to significant improvement of permittivity of ternary composites, ascribed to remarkably increased interface types and enhanced interface polarization. In comparison to binary BT/polymer composites, ternary composites could have slightly improved dielectric loss and conductivity as well as gracefully reduced breakdown strength, attributed to finely retained high interface compatibility and filler dispersion. Ternary composite containing 8 wt% BT and 2 wt% MXene had a permittivity of 77, loss of 0.15 at 100 Hz and breakdown strength of 220 MV m −1 . This work might open the door to large-scale fabrication of promising composites with high permittivity and breakdown strength under low filler loading (~ 10 wt%).
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 11
·10651-10659
·
IF 2.195
Huang Xuechen,Liu Bang,Wang Shuanghu,Liu Yuxi,Wu Gang
Bi 2 O 3 - and MgO-doped BaTiO 3 –(Na 1/4 Bi 3/4 )(Mg 1/4 Ti 3/4 )O 3 (BT–NBMT) ceramics were synthesized from a solid-state approach, and then the impacts of Bi 2 O 3 and MgO dosages on the structures and dielectric characteristics were studied. Obvious dual peaks were observed with Bi 2 O 3 dosage to 0.04 and MgO dosage to 0.02. The low-temperature dielectric stability and grain size of the Bi 2 O 3 dopant were improved, while those of the MgO dopant hardly changed with MgO dosage to 0.02, indicating the core/shell microstructure of BT–NBMT was formed following the dissolving-precipitating mechanism of BT systems doped with low-melting-point substances. The low-temperature dielectric stability of the Bi 2 O 3 - or MgO-doped BT–NBMT ceramics first improved and then deteriorated with the increase of doping concentrations. High-temperature stability and diffuse-state transition were found in the optimal ceramics. The second phases of Bi 2 O 3 and MgO, magnesium titanium compounds were observed in Bi 2 O 3 and MgO dopants, respectively. Bi 2 O 3 -doped and MgO-doped ceramics exhibited a fine-grained microstructure and significant grain growth, respectively, and the core/shell microstructure was responsible for the dielectric temperature stability for Bi 2 O 3 dopants and collapsed to a homogeneous one with remarkable grain growth and the second phases for MgO dopants.
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高影响因子
IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Kaiyuan Lai,Yurong Liu,Ruohe Yao,Kuiwei Geng
High sensitivity, highly integrated, low-power consumption, and highly flexible pressure sensors are essential for applications in fields such as electronic skin, smart robotics, and human-AI interaction. In this study, a highly sensitive integrated pressure sensor was prepared on a flexible PI substrate which includes a thin-film transistors (TFTs)-based amplifier with a P(VDF-TrFE)/BaTiO3 piezoelectric composite sensing unit. The sensing unit is connected to the extended gate of one In-doped ZnO (IZO) TFT, while the other IZO TFT serves as a load resistor for the amplifier. The integrated sensor can directly convert an external pressure applied to P(VDF-TrFE)/BaTiO3 composite into a voltage (or current) signal and amplify it without an additional charge amplifier. The results indicate the integrated sensor exhibits a low power consumption of 100 ~ 200 μW, a high sensitivity of 0.64 V/kPa, and a rapid response time of 20 ms. The integrated sensor can be used to detect human movements and vital signs in real time, such as finger bending and stretching, pulse, and vocal cord vibrations, suggesting that the integrated sensor has a great deal of promise for application in wearable health monitoring systems.
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高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 48
·33632-33639
·
IF 10.7
Xingwu Jiang,Xiang Wang,Peifeng Liu,Jinzheng Huang
Polyimide (PI), a kind of polymer with excellent heat resistance, processing, mechanical and electrical insulation performance, stands out as a prime candidate for advanced dielectric energy storage materials. However, the low dielectric constant of PI has hindered its broader development, requiring dielectric modification. In order to increase the dielectric constant of PI, PI with a polar trans-cyclohexane structure was synthesized and characterized and then reinforced with nano-C@BT-fibers to produce a novel nanofiber reinforced PI film. Experimental results demonstrate that polar trans-cyclohexane enables pure PI films to achieve a dielectric constant of 8.89 at 100 Hz. Meanwhile, the dielectric constant of C@BT-fibers/modified PI composite films was indeed increased up to 39.48 at 100 Hz and the energy storage density increases to 1.028 J cm−3 with only 1.0 wt% addition content of C@BT-fibers, increased by 117.3% compared with that of pure PI (0.473 J cm−3).
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Haiyan Wang,Linrui Bai,Shaolong Zhong,Qian Yang,Zhimin Dang
Dielectric capacitor is an important component of power systems , but its low dielectric polarization and undesirable dielectric loss have still held back the development of miniaturized microelectronic devices. Hence, we reported core@shell structured fillers with a conducting material@insulating material double-shell to improve the dielectric performance of the poly (vinylidene fluoride) (PVDF) composites. The hybrid fillers introducing ultra-short carbon nanotube (SSCNT) as an inner layer between BaTiO 3 (BT) as a core and silica (SiO 2 ) as an outer shell were synthesized. As the thickness of the insulating shell is enough thin, the BT@SSCNT@SiO 2 /PVDF composites exhibit an enhanced dielectric constant and a concurrently suppressed dielectric loss with the decreasing thickness. The composite incorporating the filler with the thinnest SiO 2 shell has the highest dielectric constant of 12.27 and the lowest dielectric loss of 0.023 at 20 wt% filler loading where the breakdown strength is about 15 less than the maximum value of 192.5 kV/mm. Furthermore, the hybrid fillers endow the composites with impressively stable dependence on frequency in a wide range of 10 2 ∼10 5 Hz. The achievement can be ascribed to the conducting property of the SSCNT inner layer and the suitable thickness of the insulating outer layer. They can synergetically provide the composites with an optimized polarization effect at a broad frequency resulting from the improved electrical field. This work reveals that a proper structure of the core@conducting material@insulating material core@double-shell filler can be an approach to optimize the overall dielectric performance of the polymer-based composites with high energy storage density .
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 24
·54557-54565
·
IF 5.1
Minghao Xu,Kaihui Hua,Bo Di,Yu Zheng,Qun Zeng,Pinhai Gao,Xiuan Xi
BaTiO 3 (BT)-based ceramics have recently become one of the most promising lead-free piezoelectric ceramics . However, its overall performance still falls short of meeting the demands for multifunctional applications. Although phase boundary regulation can enhance the piezoelectric properties , BT ceramics have very separate phase transition temperatures for different phases. This leads to the difficulty of achieving multiphase coexistence at room temperature (RT). In this work, based on doping 0.08 mol Zr 4+ , the lead-free Ba 1- x Sr x Ti 0.92 Zr 0.08 O 3 [ x = 0, 0.04, 0.08, 0.12, 0.16, 0.20 (mol), B 1- x S x TZ] piezoelectric ceramics were prepared using the solid-state reaction method, and the effect of the Sr 2+ doping level on the multiphase structural evolution and piezoelectric properties was systematically investigated. The results demonstrated that with the increase in the Sr 2+ doping content, multiphase coexistence within the B 1- x S x TZ ceramics was successfully achieved at RT. Moreover, it showed significant synergistic improvements in piezoelectric, dielectric , and electric-field-induced strain properties. At the doping level of about x = 0.16 mol, the key performance metrics of the piezoelectric ceramics were optimal. The d 33 at room temperature reached ∼447 pC/N, k p ∼0.49, and ε r ∼4649. Under an applied electric field of 10 kV/cm, S pos was ∼0.092 %, and d 33 ∗ was ∼895 p.m./V. Therefore, this study provides new insights into the progress of advanced lead-free piezoelectric materials for multifunctional applications.
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高影响因子
COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Yong-sheng Zhang,Mao Wang,Cheng Yang,Yao-wen Shao,Xiao-dong Qi,Jing-hui Yang,Yong Wang
Interfacial polarization between fillers and polymer matrix in polymer composites would be responsible for enhancement of dielectric constant ( ε ˊ ), but the dielectric mismatch between fillers and polymer also leads to an undesirable electric breakdown. Herein, we successfully developed a core-shell structured barium titanate@silver (BaTiO 3 @Ag, BT@Ag) novel heterogeneous fiber via coaxial electrospinning followed by calcination technology, to simultaneously improve the dielectric property and breakdown strength ( E b ) of poly(vinylidene fluoride) (PVDF)-based composites. Dielectric measurement reveals that PVDF/BT@Ag composites have an enhanced ε ˊ , low dielectric loss (tan δ) and moderately increased E b . Since the core-shell structured fibers help in tailoring the local electric field around the interface, but also provide double interfacial polarization, which effectively improves the dielectric properties of the composites. When the loading of BT@Ag reached up to 10 wt%, the ε ˊ increased to 19.4 @1 kHz while the E b had maximum value of 389.1 MV/m, finally resulting in an improvement of U e . Moreover, the incorporation of BT@Ag obviously improves the mechanical properties of composites. It is expected that these results would further inspire the design of fillers with novel architecture for high-performance dielectric polymer composites.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Zheng Zhou,Zhao Zhang,Qilong Zhang,Hui Yang,Yulu Zhu,Yuanyu Wang,Lu Chen
Piezoelectric nanogenerators (PENGs), as a promising solution to harvest mechanical energy from ambient environment, have attracted much attention over the past decade. Here, the core–shell structured BaTiO3@Carbon (BT@C) nanoparticles (NPs) were synthesized by a simple surface-modifying method and then used to fabricate the efficient PENGs with poly[(vinylidene fluoride)-co-trifluoroethylene] (P(VDF-TrFE)). The carbon shell with the uniform thickness of 10–15 nm can increase the content of the polar β phase in P(VDF-TrFE) and significantly enhance the interfacial polarization between BT NPs and the polymer matrix during the poling process. Out of all compositions, the 15 wt % BT@C/P(VDF-TrFE) PENG exhibited the optimal piezoelectric performance with an output voltage of ∼17 V and a maximum power of 14.3 μW under bending–releasing mode. More importantly, the PENG can also efficiently harvest other types of mechanical energy from human activities and exhibits stable output after 1500 bending–releasing cycles. When the PENG was bent and beat by bicycle spokes, a peak voltage of 16 V was generated, which can light up 12 white LEDs directly and charge the commercial capacitors. Our research provides a new strategy to fabricate flexible and efficient PENGs from a nanoscale viewpoint; it can be hopefully applied in energy-harvesting systems and wearable electric sensors.
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PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2017
·
IF 4.873
Penghao Hu,Shengmin Gao,Yangyang Zhang,Liang Zhang,Chengchen Wang
Dielectric capacitors are promising in micro-electronics, portable equipment and hybrid electric vehicles due to their specific features of flexibility, ultrahigh operating voltage and fast charging-discharging rate. The dielectric properties of polymer-based nanocomposite are much related to the interface binding between fillers and matrix. In this work, a surface modification approach employed newfound titanate coupling agent was developed to improve the compatibility between BT nanoparticles and PVDF matrix. After treated by the modifier TC-2, a coating layer contained with active organic groups was formed on the surface of BT nanoparticles. Benefited from the improved dispersibility and compatibility of modified BT nanoparticles in PVDF matrix, the breakdown strength of the nanocomposites was much enhanced. The monodisperse mBT-2 nanoparticles treated with appropriate amount of modifier dramatically enlarged the breakdown strength from 397 kV/mm for neat PVDF to 517 kV/mm for 4 vol% mBT-2 loading nanocomposite. Compared with BT/PVDF, the improvements on the energy storage performance in mBT-2/PVDF are significant. The maximum discharged energy density of 11.27 J/cm 3 for 4 vol% loading mBT-2/PVDF is nearly double of that for 4 vol% loading BT/PVDF, and the energy efficiency for mBT-2/PVDF is also increased. The modification method originally represented here has great potential in developing high energy density nanocomposites for advanced applications.
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高影响因子
危险品化学品经营许可证（带存储）