MATERIALS LETTERS
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2021
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IF 3.423
Zelong Wang,Dajun Hou,Jungang Yi,Ning Cai,Jia Guo
The application of polymer for thermal interface materials is limited by its low thermal conductivity. In this work, barium titanate coated Cu core–shell particles were prepared and then employed as thermal conductive fillers to reinforce epoxy matrix. The results indicate that thermal conductivity of the Cu@BaTiO 3 /epoxy composites reaches 1.09 W m -1 K −1 at 10 vol% loading, achieving 580% elevation on neat epoxy matrix. Meanwhile, the composites retain high electrical insulation (7.90 × 10 13 Ω·cm) due to the existence of insulative BaTiO 3 layer on Cu surface. This study will provide a novel insight of the design of functionalized core–shell thermal conductive fillers and construction of high-performance thermal interface materials.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 19
·24496-24506
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IF 2.478
Cheng Shuai,Zhang Bo-Ping,Wang Li-Jun,Yang Tao,Yuan Chang-Lai,Zhou Chang-Rong,Rao Guang-Hui,Yin Yang
The enhanced piezoelectric and ferroelectric properties of the tetragonal 0.67BiFeO 3 –0.33BaTiO 3 (BF–33BT) ceramics without MnO 2 doping or other dopants via tailoring sintering temperature ( T S ) and dwell time ( t d ) are reported. All ceramics crystallized in a single tetragonal phase, independent of the adopted T S and t d . As the T S or t d is increased, the BF–33BT ceramics show an increase in grain size and in relative density, while T S > 980 °C or t d > 6 h would result in more oxygen vacancies caused by Bi 3+ evaporation and/or reduction of Fe 3+ to Fe 2+ , along with a reduced relative density and an increased current leakage density. Because of the increased grain size, the higher relative density, and relatively less oxygen vacancies, high d 33 = 151 pC/N and P r = 25.9 μC/cm 2 were achieved in tetragonal BF–33BT ceramics with T S = 980 °C and t d = 6 h. In addition, large unipolar strain of 0.146% and \(d_{33}^{*}\) =326 pm/V (40 kV/cm), as well as high T C = 427 °C were also obtained in the BF–33BT ceramics with T S = 980 °C and t d = 6 h. Our studies indicate that the grain size, the relative density, and the oxygen vacancies play important roles for the piezoelectric properties of BF–33BT ceramics.
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Nano Energy
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2019
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IF 15.548
Yu Yang,Zhan-Sheng Gao,Minhao Yang,Ming-Sheng Zheng,Dong-Rui Wang,Jun-Wei Zha,Yong-Qiang Wen,Zhi-Min Dang
The dielectric elastomers have been widely studied in last decades due to their excellent electromechanical conversion ability. Herein, two kinds of polyurethanes (PU) with different molecular weights were used and the results demonstrated that incorporating low molecular weight (MW) PU into high MW PU not only caused the decrease in elastic modulus but also induced a high elongation at break . The optimal performances of PU mixture were observed when the content of low MW PU was 20 wt% and the PU mixture with 20 wt% low MW PU was used as the matrix in this work. In order to achieve a high electromechanical conversion performance, the surface modification of BaTiO 3 (BT) nanoparticles by 4,4′-diphenylmethane diisocyanate (MDI) was carried out and the obtained BT products (BT-MDI) were used as fillers for the PU nanocomposites . The permittivity of BT-MDI/PU nanocomposites with 6 wt% fillers increased to 8.6 at 1 kHz and the elongation at break of nanocomposites at this filler loading still remained as high as 1070%. Because of the enhanced properties, the achieved energy-conversion density reached 2.88 mJ/cm 3 at 900 V, and the conversion efficiency was up to 1.56 %. The results reveal that an effective surface modification of nanoparticles is beneficial for the improvement of electromechanical conversion behavior of composite dielectric elastomers due to both the excellent dispersion of BT-MDI nanofillers and the improved compatibility between BT-MDI nanoparticles and PU matrix.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
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IF 3.218
Jiaxin Lv,Xinli Chen,Susu Chen,He Li,Hong Deng
In this paper, an ultrasensitive photoelectrochemical sensor was developed for the detection of oxytetracycline , which was based on BaTiO 3 sensitized Cu 3 Mo 2 O 9 nano-composites with excellent visible-light photoelectrochemical activity. Cu 3 Mo 2 O 9 nanocrystals (NCs) with popsicle-like morphologies were synthesized through hydrothermal method and showed a very high photoelectrochemical signal. To achieve larger photocurrent density, nanostructured BaTiO 3 was then deposited on the surface of Cu 3 Mo 2 O 9 photocathodes, which led to 3-fold enhancement of the photocurrent as compared to pristine Cu 3 Mo 2 O 9 NCs. In order to obtain the specific response to oxytetracycline, oxytetracycline aptamer was fixed on the Au/BaTiO 3 /Cu 3 Mo 2 O 9 /FTO. Under visible light irradiation , the obtained aptamer/Au/BaTiO 3 /Cu 3 Mo 2 O 9 /FTO exhibited high sensitivity, good selectivity , outstanding reproducibility and low cost for detecting oxytetracycline. Furthermore, there was a linear relationship between detected signal and the oxytetracycline in the concentration range from 5 × 10 −10 to 10 −7 M, with a detection limit (3 S/N) of 4.6 × 10 −11 M under the optimal conditions. It is expected that this new photoelectric active material may have potential applications in biosensors, photocatalysis and other related fields.
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SURFACE & COATINGS TECHNOLOGY
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2018
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IF 2.906
Qilong Zhang,Yongchang Jiang,Enjie Yu,Hui Yang
Core-shell structured BaTiO 3 @polyaniline (BT@PANI) nanoparticles were synthesized via surface hydroxylation and in-situ polymerization method and were embedded into Poly(vinylidene fluoride- co -hexafluoropropylene) [P(VDF-HFP)] matrix. The dielectric performance as well as thermal behavior of BT@PANI/P(VDF-HFP) nanocomposite films are investigated. The crystallinity increases with increasing the BT@PANI content. Compared with BT particles, the BT@PANI core-shell nanoparticles exhibit notable improvement on dielectric properties . Typically, with a filler content of 20 vol% BT@PANI, the dielectric constant of BT@PANI/P(VDF-HFP) composite film reaches 99.1 at 1 kHz, which is 6.2 times larger than that of 20 vol% BT (16.1) and 9.6 times larger than pristine P(VDF-HFP) (10.3). Enhanced permittivity is generated from the interfacial polarization and the microcapacitor effect provided by the core-shell nanoparticles. Moreover, nanocomposite film maintains a low dielectric loss of 0.21 at 1 kHz. This research offers a solution for fabricating dielectric composite with large dielectric constant and low dielectric loss, which could be beneficial for the improvement of advanced electronic devices.
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Journal of Physical Chemistry C
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2015
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IF 4.772
Xiaoyun Huo,Weiping Li,Jiujun Zhu,Lili Li,Ya Li,Laihui Luo,Yuejin Zhu
To obtain the dielectric material with high dielectric constant and high breakdown field, here a new composite material based on Fe3O4@BaTiO3 shell–core particles and polyvinylidene fluoride (PVDF) has been prepared. It is proved the Fe3O4@BaTiO3 particles are good fillers with low conductivity for the percolation effect, which induces high dielectric constant and low dielectric loss in the Fe3O4@BaTiO3/PVDF composite. The maximum dielectric constant is up to 3893, and dielectric loss is suppressed below 0.9. Moreover, the shell layer of Fe3O4 can be the trap and scattering centers to injected charges, so that the polarization saturation can be delayed to higher field. Thus, the released energy density of this composite can be enhanced greatly due to higher breakdown strength and lower energy loss.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Tiantian Yang,Zibo Dong,Inaam Ullah,Ayesha Irfan,Jun He,Jinhe Qi,Mai Li
Efficient interfacial carrier transfer and separation can effectively enhance the photocatalytic performance. Herein, a high-performance g-C 3 N 4 /Ag/BaTiO 3 heterostructure was constructed, which showed promising results in photocatalytic nitrogen fixation and tetracycline degradation. Specifically, Ag-modified tetragonal barium titanate (BaTiO 3 ) nanoparticles were combined with flower-like spherical graphitic carbon nitride (g-C 3 N 4 ) to prepare the g-C 3 N 4 /Ag/BaTiO 3 photocatalyst. The Ag nanoparticles were uniformly distributed on BaTiO 3 through photodeposition, which was subsequently loaded onto g-C 3 N 4 , offering abundant surface active sites and a large surface area for enhanced photocatalytic activity. Four types of composite photocatalysts were prepared. The 1:3-g-C 3 N 4 /Ag/BaTiO 3 photocatalytic composite, composed of g-C 3 N 4 and Ag/BaTiO 3 in a 1:3 ratio, achieved an impressive nitrogen fixation rate of 765.85 μmol g −1 h −1 , greatly exceeding that of pure g-C 3 N 4 and BaTiO 3 by factors of 2.14 and 3.88, respectively. Also 1:3-g-C 3 N 4 /Ag/BaTiO 3 had the highest tetracycline degradation rate of 82.7 %. It was found that the significant improvement of photocatalytic efficiency could be attributed to the ultrasonic vibration-induced piezoelectric polarization of BaTiO 3 , which generates an intrapolar electric field. Additionally, the noble metal Ag nanoparticles with surface plasmon resonance (SPR) effect can be used as electronic mediators to promote charge separation and transfer to form all-solid Z-type heterojunctions. This Z-type heterojunction effectively minimizes the recombination of photogenerated charge carriers of electrons and holes. Studies have shown that this composite photocatalyst exhibits excellent performance in both photocatalytic nitrogen fixation and the degradation of organic pollutants, highlighting the great potential of this composite heterojunction in photocatalysis.
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Journal of Materials Chemistry C
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2024
·Vol. 12
·期 8
·2993-3004
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IF 5.7
Yujie Wu,Hang Zhao,Na Zhang,Huiqin Wang,Chuying Zhang,Lei Yin,Jinbo Bai
Dielectric capacitors with ultra-high power density and rapid charge–discharge rate are indispensable energy storage components in pulse power systems. However, the low intrinsic energy density of conventional dielectrics limits their application in modern electrical and electronic industries. To solve this problem, in this work, ultrafine BaTiO3 nanoparticles coated with a surface-charged chitosan (CS) shell were synthesized by combining hydrothermal and electrostatic self-assembly approaches. A tiny amount of BaTiO3@CS core–shell construction (∼0.2 vol%) endowed the polypropylene (PP)-based composite dielectrics with a significantly improved energy storage density (Ue) of 4.76 J cm−3, which is a 269% increase compared to that of neat PP (Ue ∼ 1.77 J cm−3). Meanwhile, a high discharging efficiency of 93.9% was also maintained. In addition, the breakdown strength of BaTiO3@CS/PP composite dielectrics (∼435 MV m−1) was effectively improved at an elevated temperature (105 °C), which is 16.9% higher than that of neat PP (∼372 MV m−1). Both the enhanced interfacial polarization and high electron affinity provided by the BaTiO3@CS ultrafine constructions are beneficial to the improvement of dielectric and insulating performances of the composites, which were also confirmed by finite element simulation. This study provides an effective and feasible strategy for preparing composite dielectrics with superior overall energy storage performance.
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Polymer Chemistry
·
2017
·Vol. 9
·期 5
·548-557
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IF 5.375
Sheng Chen,Xuguang Lv,Xianghui Han,Hang Luo,Chris R. Bowen,Dou Zhang
Dielectric nanocomposites incorporating core–shell structured nanoparticles have drawn increasing attention in recent years for energy storage applications. Among the many key factors, the thickness and the chemical structure of the interfacial layer are rarely investigated. This work presents a novel approach to precisely tailor the interfacial layer thicknesses by modulating the polymerization degree of a rigid liquid-crystalline fluoro-polymer. BaTiO3@rigid-fluoro-polymer nanoparticles with a range of interfacial thicknesses were prepared by a surface-initiated reversible-addition–fragmentation chain transfer polymerization method. The frequency dependent dielectric properties and energy storage capability of dielectric nanocomposites based on a poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) P(VDF-TrFE-CTFE) matrix and the modified BaTiO3 nanofiller were investigated. The results demonstrated that the permittivity, breakdown strength and energy density of the polymer nanocomposites were significantly affected by the thickness of the rigid-fluoro-polymer shell around BaTiO3. Moreover, a high discharged energy density of 16.18 J cm−3 was achieved in nanocomposites containing 5 vol% BaTiO3, when the shell thickness was approximately 11 nm. The findings provide a new and innovative approach to prepare dielectric composites with high energy density, and enable a deeper understanding of the influence of the interfacial layer thickness on the dielectric performance.
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PHYSICA B-CONDENSED MATTER
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2024
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IF 2.8
Qihuang Deng,Hong Liu,Yangrui Wang,Maolin Bo,Tielin He,Xue Zhang,Yue Li,Jinliang Zhu,Yue Pei,Yefeng Feng
BaTiO 3 (BTO) based nanoceramics play an important role in electronic devices. Here, we synthesized three BTO-based high-entropy nanoceramics and calculated their band gaps via density functional theory (DFT). Firstly, cubic high-entropy ceramic powders, namely (La 0.2 Ca 0.2 Sr 0.2 Ba 0.2 Li 0.2 )TiO 3 , Ba(Ti 0.2 Sn 0.2 Zr 0.2 Hf 0.2 Nb 0.2 )O 3 and Ba(Ti 0.2 Sn 0.2 Hf 0.2 Zr 0.2 Ta 0.2 )O 3 , were synthesized. Then, composition and morphology of powders was determined. Ultimately, their band gaps were calculated. We clarified the influence of metal co-doping on band gaps. Dirac-cone band-structure was found in Ba(Ti 0.2 Sn 0.2 Zr 0.2 Hf 0.2 Nb 0.2 )O 3 . Compared with BTO (band gap 1.821 eV), BTO-based high-entropy ceramics can have the reduced band gaps (1.549 eV; 0.001 eV; 0 eV) using various co-doping. By high-entropy strategy, conductive ability of BTO-based ceramic is regulated. Experimental results of polymer/ceramic composite dielectrics and theoretical results of ceramics are consistent. Dirac-cone ceramic filler is promising for preparing polymer-based composites for energy storage. This research enables mass preparation of high-entropy ceramic/polymer dielectric composites.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2024
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IF 3.5
Pengfei Wang,Xiong Huang,Jianwei Zhao,Saiwei Luan,Xinyu Fu,Bo Li,Jun Yang,Zhenxiao Fu,Xiuhua Cao,Lei Zhang,Shuhui Yu,Rong Sun
It has generally been believed that the performance of ultra-thin multilayer ceramic capacitors (MLCCs) are mainly controlled by doping elements and the contribution of synthesis approaches of BaTiO 3 (BT) powders can be neglected. However, in this study, we demonstrate that the solid-state powders exhibit a heterogeneous distribution of residual BaCO 3 (BC), TiO 2 , or Ti-rich phases, whereas hydrothermal powders are characterized by a BC surface layer, which can be characterized by nanoinfrared (AFM-IR), and the divergent approaches play an important role in the “core–shell” structure. The BC layer in hydrothermal BT contributes to Ti vacancies during sintering, increasing the “core–shell” ratio in MLCCs. This results in augmented capacitance but reduced performance at elevated temperatures. Conversely, the presence of a Ti-rich phase in solid-state powders induces Ba vacancies, leading to decreased “core–shell” ratios and dielectric constants.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Xiang Li,Binbin Dan,Shixuan Li,Xiang Liu,Di Wang
The sluggish kinetics linked to CO 2 evolution reaction (CO 2 ER) processes, coupled with substantial electrode passivation, impose considerable constraints on the practical application of Li-CO 2 batteries. This study utilized ultrasound tech to enhance the synergistic modulation of defects and piezoelectric properties. By the concurrent creation of high-concentration oxygen vacancies (OVs) and the amplification of the inherent piezoelectric polarization field in BaTiO 3 material, the hysteresis of CO 2 ER processes and the occurrence of electrode passivation in Li-CO 2 batteries has been significantly improved. Further investigations reveal that high OV concentrations cause electronic structure reconstruction, leading to band gap contraction and Fermi energy level upshift, meanwhile, the augmented piezoelectric polarization field facilitates the directional migration of carriers, facilitating the growth of Li 2 CO 3 via the inherent electric field. Based on this synergistic mechanism, reversible decomposition of Li 2 CO 3 has been realized and Li-CO 2 cells with ultrasonic BTO cathode even exhibits a long cycle life of 375 cycles at the current density of 500 mA g −1 . This one-step physical field synergistic regulation of defect states in ferroelectric materials and their piezoelectric properties establishes a novel paradigm and mechanistic foundation for overcoming efficiency bottlenecks in piezoelectric catalytic systems and Li-CO 2 batteries.
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