Journal of Advanced Dielectrics
·
2023
·
IF 3.1
Yan Gu,Faqiang Zhang,Wanghua Wu,Zhifu Liu
Most widely used dielectrics for MLCC are based on BaTiO 3 composition which inevitably shows performance degradation during the application due to the migration of oxygen vacancies ( V o ⋅ ⋅ ). Here, the BaTiO 3 , ( Ba 0 . 9 7 Ca 0 . 0 3 )TiO 3 , Ba( Ti 0 . 9 8 Mg 0 . 0 2 )O 3 , ( Ba 0 . 9 7 Ca 0 . 0 3 )( Ti 0 . 9 8 Mg 0 . 0 2 )O 3 , ( Ba 0 . 9 6 Ca 0 . 0 3 Dy 0 . 0 1 )( Ti 0 . 9 8 Mg 0 . 0 2 )O 3 ceramics (denoted as BT, BCT, BTM, BCTM and BCDTM, respectively) were prepared by a solid-state reaction method. The core-shell structured grains ( ∼ 200 nm) featured with 10-20 nm wide shell were observed and contributed to the relatively flat dielectric constant-temperature spectra of BTM, BCTM and BCDTM ceramics. The TSDC study found that the single/ mix doping of Ca 2 + , especially the Mg 2 + , Mg 2 + /Ca 2 + and Mg 2 + /Ca 2 + /Dy 3 + could limit the emergence of V o ⋅ ⋅ during the sintering and suppress its long-range migration under the electric-field. Because of this, the highly accelerated lifetimes of the ceramics were increased and the value of BCDTM is 377 times higher than that of BT ceramics. The p − n junction model was built to explain the correlation mechanism between the long-range migration of V o ⋅ ⋅ and the significantly increased leakage current of BT-based dielectrics in the late stage of HALT.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Lu Yang,Xi Chen,Jingxiang Zhang,Haoliang Zhang,Qiuying Zhao,Haiyan He,Huajie Huang,Yanjie Wang
High-efficient and recyclable piezo-photocatalysts are garnering substantial attention in line with the advancements in environmental purification. Herein, a novel micropatterned piezo-photocatalytic composite film, wherein BaTiO 3 @TiO 2 core-shell nanoparticles are embedded within porous poly(vinylidene fluoride) matrix, is developed. The impressive synergy between photocatalytic and dual piezocatalytic effects emanating from integrated components contributes to significantly amplified piezo-photocatalysis process. Moreover, by modulating the geometric structure of nanofiller along with topographical pattern design, one can further harness the piezo-photocatalysis effect upon electrical poling. As a result, the newly-developed composite film exhibits distinguished piezophotocatalytic activity, i.e., the degradation efficiency of highly-concentrated Methyl Orange (MO) solution (C 0 = 10 mg/L, 100 mL) reaches 97.3 % within 90 min, implying its viability as high-performance piezo-photocatalysts.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 9
·1-12
·
IF 2.8
Luan Saiwei,Tang Miao,Mu Hanze,Yu Jie,Wang Pengfei,Zhang Lei
Highly tetragonal BaTiO 3 nanopowder serves as a pivotal raw material for manufacturing high-performance miniaturized multilayer ceramic capacitors (MLCCs). In this study, barium acetate and tetrabutyl titanate were used as reactants, isopropanol served as the titanium source stabilizer and dispersant, and oxalic acid was employed as the precipitant to investigate the preparation process of tetragonal-phase BaTiO 3 nanopowder. The optimal process parameters were identified, and the reaction mechanism for synthesizing BaTiO 3 via oxalate co-precipitation was explored. The experimental results indicate that, with a Ba/Ti stoichiometric ratio of 1.000 and a solution pH of 2.33, following the appropriate sequence of experimental reagent additions, the precursor underwent a precipitation reaction at 25 °C. After calcination at 950 °C, BaTiO 3 powder with an average particle size of 56 nm and a tetragonality of 1.0075 was successfully synthesized. The BaTiO 3 ceramic sintered at 1250 °C exhibits a density of 96.5% and an exceptional dielectric performance, with a dielectric constant of 9369 at the Curie temperature (125 °C). This study provides valuable insights for addressing the complex hydrolysis and residual chloride ion issues associated with the chloride method.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Yufei Tang,Lei Chen,Zihao Duan,Kang Zhao,Zixiang Wu
Barium titanate (BaTiO 3 ) has been used as a bone implant material because of its piezoelectric properties and the ability to promote cell growth when combined with hydroxyapatite. However, the brittleness of BaTiO 3 inhibits its use as a bone replacement material at load-bearing sites, and the reduction of BaTiO 3 content in the composite reduces its piezoelectric effect on bone growth. In this study, we explored a preparation method, which included directional freeze casting and self-solidification of bone cement, to obtain 1-3-type BaTiO 3 /PMMA bio-piezoelectric composites with a lamellar structure. The lamellar BaTiO 3 layer through the composite from the bottom to the top significantly improved the piezoelectric properties of the composite. In addition, the dendritic ceramic bridges on the BaTiO 3 pore walls can improve the compressive strength and elastic modulus of BaTiO 3 /PMMA bio-piezoelectric composites with a lamellar structure. More importantly, it was found that polarized lamellar BaTiO 3 could induce osteoblasts to grow in the direction of the BaTiO 3 layers. When the width of the BaTiO 3 layer was in the range of 8–21 μm, osteoblasts along the BaTiO 3 layer showed well growth, which can be of great value for the production of biomimetic bone units.
研究领域:
生物医学工程
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材料科学
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组织工程
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产品关联
DOI
PubMed
高影响因子
Environmental Science-Nano
·
2019
·Vol. 6
·期 7
·2241-2252
·
IF 7.704
Jinxi Feng,Jingxiang Sun,Xiaosheng Liu,Jinzhu Zhu,Ya Xiong,Shuanghong Tian
Two electrocatalysts Pt and RuO2 were directionally co-loaded on the nano-piezomaterial t-BaTiO3 by a two-step process: the alkali deposition–oxidation of RuO2 followed by the selective photo-reduction deposition of Pt. It was found that both Pt and RuO2 could considerably improve the piezo-degradation efficiency of t-BaTiO3 for pollutants. For the biorefractory pesticide tricyclazole, RuO2/t-BaTiO3/Pt possessed a piezo-degradation kinetic constant of 0.032 min−1. The rate constant was 3.11, 2.56 and 2.58 times that of t-BaTiO3, Pt/t-BaTiO3 and RuO2/t-BaTiO3, respectively. Moreover, the rate constant of RuO2/t-BaTiO3/Pt was greater than the sum (0.025 min−1) of the rate constants of two single-loaded materials, Pt/t-BaTiO3 and RuO2/t-BaTiO3. This indicates that co-loaded Pt and RuO2 in RuO2/t-BaTiO3/Pt have a synergistic enhancement effect on the piezo-degradation. By analyzing the kind and amount of the reactive oxygen species (˙OH, 1O2, ˙O2− and H2O2) from these nano-piezocatalytic systems, it was inferred that Pt acted as a cathodic- and anodic-like catalyst while RuO2 acted as an anodic-like catalyst. The mechanism of the synergistic catalysis for co-loaded Pt and RuO2 was similar to the principle of an electrolytic reactor, in which Pt and RuO2 were its two catalytic nano-electrodes and the power was from the piezo-potential of t-BaTiO3.
研究领域:
环境科学
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材料科学
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催化
·
污染物降解
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Silin Tang,Yingzhi Meng,Yongqing Cai,Biaolin Peng,Laijun Liu,Qingqing Ke
Ferroelectric electrocaloric (EC) materials are a pivotal part of sustainable micro-cooling, which complements conventional cooling methods in miniaturized devices. However, the application of EC materials is largely limited by the unsatisfactory room-temperature EC response and narrow operation temperature window. In this work, with careful tuning the composition of BaTiO 3 (BT)-based ceramics through the conventional doping method, enhanced EC properties were achieved in Ba 0.8 Sr 0.2 Zr x (Ti 0.999 Mn 0.001 ) 1- x O 3 (BSZMT) ( x = 0.05, 0.10, 0.15, and 0.20). We especially found that the electrocaloric temperature change ( ΔT ) of > 0.50 K was achieved in a broaden temperature ranging from 20 °C to 95 °C and a peak ΔT value of 1.08 K was achieved at temperature of 70 °C in our BSZMT with x = 0.15. To ascertain the physical mechanism, we employed hybrid characterization methods including XRD , Raman, and dielectric analysis together with Density Functional Theory (DFT) calculation. Our results clearly show that the doped Zr and Mn at B site of BSZMT effectively modulate the microstructure leading to coexistence of different ferroelectric phases and broken long-range ferroelectric order, which subsequently results in the enhanced EC performance and broad operating temperature window.
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 14
·4614-4622
·
IF 6.4
Xingmin Liu,Jinling Tong,Jijie Wang,Shaowei Lu,Dongxu Yang,Hongmei Li,Chunzhong Liu,Yutong Song
Flexible piezoelectric pressure sensors have a great application prospect in wearable electronic products due to the advantages of low cost, fast response speed and a self-powered system. However, traditional films based on piezoelectric ceramic/polymer materials face problems such as poor dispersion and insufficient polarization, which hinder the piezoelectric performance of pressure sensors. In this work, MXene was introduced to modify the surface of barium titanate (BaTiO3), which was blended with poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) matrix. An electrospinning method was adapted to fabricate BaTiO3/MXene/PVDF-TrFE composite films. This work proposed a new microscopic sensing mechanism. In addition, this MXene-modification strategy could improve the dispersion of BaTiO3 into the PVDF-TrFE matrix, increase the polarization efficiency and enhance the piezoelectric performance of the sensors. The results showed that the composite film with 0.15 wt% MXene could achieve a remarkable output voltage of 7.6 V. In addition, the tensile strength of the composite film with 0.15 wt% MXene (20.8 MPa) was 77.8% higher than that without MXene (11.7 MPa). Meanwhile, the β phase content of the composite film could reach 81.04%, and the crystallinity increased from 39.49% to 50.31%. The fabricated piezoelectric pressure sensor had a wide detection range (0.2–400 kPa) and a short response time (56 ms). Besides, even after undergoing over 5000 compression cycles, it maintained a stable piezoelectric response. This pressure sensor could quickly respond to joint movements and strenuous exercises in humans. Therefore, this pressure sensor showed great advantages and potential in the application of human motion monitoring.
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
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2019
·Vol. 217
·期 2
·1900721
·
IF 1.606
Xin Yi,Cong Ji,Gang Chen,Hongqi Yang,Hualei Yong,Chunlin Fu,Wei Cai,Rongli Gao,Tao Fan,Zhenhua Wang,Xiaoling Deng
(0.9 – x )BaTiO 3 –0.1BiYbO 3 – x BiAlO 3 ( x = 0, 0.02, 0.04, and 0.08) lead-free ferroelectric ceramics are synthesized using conventional sintering (CS) and microwave sintering (MWS) methods. The microstructure, dielectric and ferroelectric properties, relaxation behavior, and energy storage properties are investigated systematically. X-ray diffraction (XRD) patterns show a single perovskite phase for all samples. Scanning electron microscope (SEM) images indicate that MWS method can impede the grain growth, whereas the introduction of BiAlO 3 can lead to the increase in the grain size. Dielectric measurements reveal that an obvious dielectric relaxation behavior can be strengthened by MWS, and the improvement of the dielectric constant ( ε r ) of ceramics is realized by MWS. Incorporated with BiAlO 3 contributes to enhancement of the frequency and temperature stabilities of the dielectric constant for BaTiO 3 –BiYbO 3 ceramics. The slim hysteresis loops are observed, and the maximum polarization of the sample sintered by MWS is higher than that sintered by CS. The MWS samples possess a higher energy density which is about 2 times larger than that of CS samples, and the largest energy storage density ≈0.86 J cm −3 and energy storage efficiency ≈97.44% are, respectively, obtained at x = 0 and 0.04 for MWS ceramics.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
POLYMER TESTING
·
2018
·
IF 2.247
Yue Yuan,Mingzhen Xu,Hai Pan,Dengxun Ren,Kui Li,Xiaobo Liu
Secondary dispersion of the nano barium titanate (BaTiO 3 ) was performed to obtain the fiber-reinforced polyarylene ether nitrile-based (PEN) composite laminates with improved mechanical properties . BaTiO 3 /PEN composite films were prepared via casting with ultrasonic dispersion, and then the glass fiber-reinforced (GF) composite laminates were obtained by the hot-melting method, which were favored to realize the secondary dispersion of the BaTiO 3 nanoparticles . The fracture surface of the BaTiO 3 /PEN films and BaTiO 3 /PEN/GF composite laminates investigated by SEM showed that the BaTiO 3 dispersed homogenously both in the PEN matrix and the gaps between the fibers. The mechanical and thermo-mechanical properties of the laminates were characterized and results indicated that the nano-BaTiO 3 particles and fibers show enhanced synergistic effects. That is, with increasing the BaTiO 3 content, the flexural strength and modulus of the composite laminates increased correspondingly, as well as the glass transition temperatures . Additionally, with the introduction of nano-BaTiO 3 particles, the dielectric constants (>5.5 at 1 kHz) of the composite laminates were improved obviously and the low dielectric loss (˂0.02 at 1 kHz) was maintained. The temperatures at weight loss 5% ( T 5% ) of all the composite laminates with various content of BaTiO 3 were over 490 °C both in N 2 and air atomosphere. Good dielectric properties and outstanding thermo-mechanical properties would enable the PEN-based fiber-reinforced composite laminates as the candidates in the material fields of structure-functional integrations.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Yongfei Cui,Huanhuan Sun,Guodong Shen,Panpan Jing,Yongping Pu
Cocatalyst surface-loading has been regarded as an effective strategy to promote solar-energy-conversion efficiency. However, the potential influence of surface modification with cocatalysts on the photodegradation pathway and the underlying mechanisms is still unclear. Herein, we have used ferroelectric BaTiO3 as the substrate, and both the reduction cocatalyst Ag and the oxidation cocatalyst MnOx have been successfully loaded onto BaTiO3 simultaneously by a one-step photodeposition method as evidenced by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). The influence of dual-cocatalyst surface-loading on photodegradation of rhodamine B has been systematically investigated for the first time. First, the dual-cocatalyst-modified BaTiO3 outperformed over the single-cocatalyst-loaded BaTiO3, and the photodegradation rate of Ag/BaTiO3/MnOx is about 3 times and 12 times as high as that of Ag/BaTiO3 and BaTiO3/MnOx, respectively. The credit is given to the synergistic effect between the reduction and oxidation cocatalysts, prompting charge carrier separation and migration as verified by the transient photocurrent, electrochemical impedance, and photoluminescence (PL) spectrum investigation. Second, in addition to the boosted photodegradation activity, the photodegradation pathway is found to be altered as well when using Ag/BaTiO3/MnOx. High-performance liquid chromatography (HPLC) analysis indicated that a highly selective stepwise deethylation process predominates over chromophore cleavage in the Ag/BaTiO3/MnOx system, while it is reverse for the Ag/BaTiO3 system. This phenomenon is attributed to the different dye molecule adsorption modes. Furthermore, the radical trapping experiment shows that holes play a major role in the degradation process, and the recycle test proves the excellent stability of Ag/BaTiO3/MnOx. Our findings may add another layer of understanding depth to cocatalyst surface modification in photodegradation applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Junhua Li,Xiaowei Wei,Xi-xi Sun,Ruichen Li,Chao Wu,Jiayang Liao,Ting Zheng,Jiagang Wu
Piezocatalysis is regarded as a fascinating technology for water remediation and possible disease treatment. A high piezoelectric coefficient (d33) is one of the most important parameters to determine piezocatalytic performance, which can be manipulated via phase boundary design. Herein, a novel strategy for excellent piezocatalytic activity in lead-free BaTiO3-based materials via manipulating the multiphase coexistence is proposed. The piezocatalyst of 0.82Ba(Ti0.89Sn0.11)O3-0.18(Ba0.7Ca0.3)TiO3 (0.82BTS-0.18BCT) with multiphase coexistence is prepared, and a large d33 can be obtained. As a result, 0.82BTS-0.18BCT exhibits excellent piezocatalytic performance for the degradation of Rhodamine B (RhB). Furthermore, the removal rate of RhB could reach more than 90% after vibration for 30 min, and the reaction rate constant (k) could reach 0.0706 min–1, which is much superior to that of most other representative perovskite-structured piezoelectric materials. Excellent piezocatalytic performance can be attributed to the strong local ferro-/piezoelectric response induced by the multiphase coexistence, as confirmed by the in situ piezoresponse force microscopy (PFM). Finally, the piezocatalytic degradation mechanism is analyzed systemically and proposed. This work not only provides a high-efficiency piezocatalyst but also sheds light on developing efficient BT-based piezocatalysts by manipulating the multiphase coexistence.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Yijun Fu,Chaowei Li,Yue Cheng,Yaling He,Wei Zhang,Qufu Wei,Dawei Li
Biomass aerogel materials are increasingly attracting researchers’ attention because of good biocompatibility of biomass materials and multiple functional features of aerogel materials. Herein, novel biomass aerogel composite was fabricated by doping hydroxylated barium titanate (BT-OH) nanoparticles and MXene in chitosan/bacterial cellulose (CB) aerogel by simple methods containing chemical modification, physical mixture and lyophilization. The novel aerogel composite named CB/BT-OH/MXene showed favorable piezoelectric properties and excellent photothermal antibacterial properties. The aerogel composite-based piezoelectric sensor displayed short response time (0.4 s), high response sensitivity (800 mV/N), and long cycle stability (over 1000 cycles), which could monitor various body movements, including fingers bending, speaking, wrist bending, elbow bending, smiling, and walking. Moreover, the aerogel composite possessed satisfactory photothermal conversion ability, which could reach 55 ℃ by 10 s of near-infrared irradiation (808 nm, 0.2 W/cm 2 ), successfully achieving complete sterilization effect towards S. aureus and E. coli . The novel biomass aerogel composite may find its potential applications in wearable or implantable self-powered sensors with satisfactory antibacterial performance.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 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）