NANOTECHNOLOGY
·
2017
·Vol. 28
·期 7
·075203
·
IF 3.44
Danish Ali,Bin Yu,Xiaochao Duan,Hao Yu,Meifang Zhu
In the modern era, the invention of new energy sources is important in order to make advances possible in electronic media. A triboelectric nanogenerator (TENG) is considered to be strong design that converts mechanical power into electrical power, using organic (polymer) or inorganic (lead, ceramic etc) materials to initiate the triboelectrification process, followed by charge separation. In this study, a lead-free BaTiO3/PDMS-Al-based TENG was fabricated by mixing tetragonal ferroelectric BaTiO3 nanocrystals in a PDMS matrix to make a composite for a working electrode film. It is worth noting that a new post- poling process has been introduced to align the dipole structures in the BaTiO3 nanocrystals, and to attain a high electron density on the surface of the working electrode film. The output was recorded up to 375 V and 6 μA of close circuit voltage and short circuit current, respectively, at a current density of 0.3 μA cm−2 and an effective power equal to 2.25 mW at a load resistance of 100 MΩ, and is four times higher than a PDMS-Al-based TENG. This study also reveals the hidden locks that will enable other inorganic materials with a dipole structure to enhance their output using the post-poling technique. The TENG has a vast field of applications due to its stability, the flexibility of its thin films and its biocompatibility. It is also an aid for exploring new TENG devices with enhanced output performance.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROCERAMICS
·
2023
·Vol. 50
·期 4
·97-111
·
IF 1.7
Luan Saiwei,Wang Pengfei,Zhang Lei,He Yanmei,Huang Xiong,Jian Gang,Liu Cuicui,Yu Shuhui,Sun Rong,Cao Xiuhua,Fu Zhenxiao
Ultrafine ceramic powders with high tetragonality are the fundamental for the multi-layer ceramic capacitors (MLCCs). In this study, an efficient method of atmospherically hydrothermal assisted solid-state synthesis for ultrafine BaTiO 3 particles is presented. The BaTiO 3 nanopowders with homogeneous distribution, a mean particle size ~ 260 nm and high tetragonality of 1.0095 were obtained by at the optimal parameters of hydrothermal time of 6 h, Ba(OH) 2 ·8H 2 O/BaCO 3 = 0.25/0.75 and calcination temperature of 1000 o C. XRD and HRTEM analyses revealed a “core-shell” structure of TiO 2 @BaTiO 3 formed in the first-step hydrothermal process, which reduces the diffusion distance between BaCO 3 and TiO 2 , resulting in a lower calcination temperature at the second-step solid-state reaction. Compared with pure hydrothermal and solid-state reaction processes, the atmospherically hydrothermal assisted solid-state synthesis in this study shows larger ability for improving the particle size distribution and the tetragonality, reducing defects of BaTiO 3 particles. In particular, the grain size, sintering density, and dielectric constant at the Curie temperature of BaTiO 3 ceramics are 1.93 μm, 98%, and 7066, respectively. In the solid-state reaction stage, the lattice diffusion distance from BaO to TiO 2 tends to decrease due to the formation of BaTiO 3 shells, thus, high tetragonal and relatively small particle size of BaTiO 3 powder was synthesized. This work presents a method for preparing ultrafine BaTiO 3 powders with large tetragonality for MLCCs.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2018
·
IF 13.12
Ming-Sheng Zheng,Yu-Ting Zheng,Jun-Wei Zha,Yu Yang,Peng Han,Yong-Qiang Wen,Zhi-Min Dang
The low permittivity of the polypropylene (PP) film has become a barrier for the further development of film capacitors with high energy storage density . An advanced strategy of the high-permittivity filler/polymer nanocomposite turns out to be a promising way of solving this problem. In this work, we coated ethylene propylene diene monomer (EPDM) as the shell on the surfaces of BaTiO 3 successfully to fabricate core-shell structural nanoparticles . The addition of surface rubberized BaTiO 3 into PP matrix promotes the permittivity to about 5.8, while the dielectric loss is barely changed as compared with PP itself. In addition, the elongation at break is as high as 364%, which is over 4 times higher than that of PP. The influences of shell thickness (3 nm, 5 nm and 7 nm) for the nanoparticles and hot-stretching process for the nanocomposite films were also carefully investigated, both of which greatly affected the properties of nanocomposites. Finally, the optimum breakdown strength as high as 370 MV/m is obtained, leading to a maximum energy density of 3.06 J/cm 3 , which can be attributed to both high breakdown strength and high permittivity of the core-shell structural BaTiO 3 /PP nanocomposites.
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
CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Wenwen Wang,Lixin Cao,Wei Liu,Ge Su,Wenxing Zhang
BaTiO 3 powders were successfully prepared by a novel sol–gel-hydrothermal method using tetrabutyl titanate and barium acetate as the main raw materials. The phase composition and microstructure of the powders were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results indicate that BaTiO 3 powders with well-developed crystallinity and good morphology could be synthesized at 120 °C (12 h) comparatively lower than the normal sol–gel route. The crystallinity and morphology were less affected by further increasing the reaction temperature and time. However, the KOH concentration had a great impact on the crystallinity and particles size of the powders that were all cubic phase with perovskite structure.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Xuedong Wei,Ruiguang Xing,Bangwen Zhang,Qiwei Zhang,Chaoke Bulin
To achieve high- ε r , low-tg σ polymer composites , a multistep grafting route was designed to coat BaTiO 3 (BT) nanoparticles with polymer PATP and then composite them with epoxy resin. FTIR and TGA were used to evaluate the chemical grafting of BT nanoparticles. TEM and SEM were utilized to characterize the morphology and microstructure of samples. The effects of surface modification and filler fraction on dielectric properties were investigated. The results show BT nanoparticles were successfully encapsulated with a PATP shell of 5–10 nm, which not only improves the dispersion of BT nanoparticles in epoxy resin, but also suppresses the dielectric loss of composites. The obtained composites have high dielectric constant and very low dielectric loss, which can be tailored by surface modification of nano-BT and varying the filler fraction.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Yujing Zhang,Yilin Zhang,Yuping Li,Minhao Yao,Xuefei Miao,Chuyang Liu,Huikun Zhao,Yanyan Shao,Feng Xu
BaTiO3@C nanoparticles with a core–shell nanostructure were synthesized through a facile hydrothermal and dopamine carbonization process. The microstructure of nanoparticles and microwave absorption performance of the nanoparticle/paraffin composite were systematically investigated. Dense heterogeneous interfaces and conductive carbon shells are formed on the surfaces of the BaTiO3 nanoparticles. The enhanced interfacial polarization, dipole polarization, and conductive loss contribute to the improved microwave absorption properties with a minimum reflection loss of −27.1 dB (>99.9% microwave absorption) and a broad bandwidth of 6.0 GHz at a thickness of only 1.8 mm. This work suggests a feasible approach for the efficient production of core–shell-structured nanoparticles with excellent absorption properties.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 31
·期 3
·433-439
·
IF 2.162
Fengmei Cheng,Hao Li,Haidong Li
High dielectric constant is highly desirable in capacitors and memory devices. In this work, oleic acid (OA)-capped BaTiO 3 nanocrystals were synthesized by a two-phase approach. Polyimide (PI)/BaTiO 3 -nanocrystal composite thin films with high dielectric constant have been successfully fabricated. The morphologies and dielectric properties of the hybrid films were exploited. The results showed that BaTiO 3 nanocrystals can be uniformly dispersed in the PI thin films owing to the surface modification of OA-capped BaTiO 3 nanocrystals. It was found that the dielectric constant of composite film varies with the volume fraction of BaTiO 3 nanocrystals and sintering temperatures and reaches a maximum value of 44.1, which is around 13 times higher than that of pristine PI thin film (3.2). These results demonstrated that PI/BaTiO 3 -nanocrystal composite films have considerable application potential in microelectronic fields.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 4
·3768-3773
·
IF 1.798
Shen Zhengbo,Wang Xiaohui,Li Longtu
Ta-doped 0.90BaTiO 3 –0.10(Bi 0.5 Na 0.5 )TiO 3 ceramics were successfully prepared by conventional solid-state reaction method and studied to satisfy super-broad temperature stability. The effects of Ta 2 O 5 doping on the dielectric properties and microstructures were thoroughly investigated. Ta plays an important role in the formation of core–shell structure because of chemical inhomogeneity, which gives rise to the weak temperature dependence of dielectric properties. The samples with the additon of 1.5 mol% Ta 2 O 5 satisfy the X9R specification, exhibiting an optimum dielectric behavior of ε
r
~ 2100, tanδ ~ 1.6% at room temperature, which is a promising candidate material for X9R MLCC applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2017
·
IF 12.343
Jiang Wu,Ni Qin,Dinghua Bao
Piezocatalysis is a catalytic effect driven by the stress-induced electricity of piezoelectric crystallites . In this study, piezoelectric BaTiO 3 nanowires and nanoparticles were synthesized and their piezocatalytic activity was investigated. The BaTiO 3 nanowires exhibit effectively enhanced piezocatalytic activity under ultrasonic vibration compared with the BaTiO 3 nanoparticles. On the basis of the piezoelectric potential analysis by finite element method simulation for BaTiO 3 nanowires and nanoparticles under ultrasonic vibration, the enhanced piezocatalytic activity of the BaTiO 3 nanowires can be attributed to the larger piezoelectric potential along the polar axis. In addition, we also demonstrate that the intrinsic charge carriers (not piezoelectric charges) in piezoelectric crystallites play the role of charge transfer in the catalysis process through regulating the concentration of charge carriers. Our work provides further understanding of piezocatalysis of piezoelectric nanomaterials as well as insights on the relationship between piezoelectric potential and piezocatalysis.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jian Ji,Dawei Ye,Yuming Zhong,Yuliang Mai,Jiazhi Chen
Tribocatalysis for environmental remediation faces ongoing challenges related to elucidating complex mechanistic pathways and achieving efficient performance. Engineering surface oxygen vacancies within material systems holds promise for improving overall tribocatalytic efficiency. Herein, a facile solid-phase reduction method was used to generate oxygen vacancies-rich BaTiO 3 (R-BaTiO 3 ). Both the pristine BaTiO 3 and R-BaTiO 3 can harvest friction energy for further tribocatalytic degradation of RhB. The R-BaTiO 3 exhibited remarkably higher degradation rate constant for RhB removal, i.e., 0.177 h −1 , than that for the pristine BaTiO 3 , i.e., 0.0789 h −1 . The introduction of oxygen vacancies in R-BaTiO 3 reduced the energy bandgap and facilitated effective electron-hole separation, leading to the generation of more reactive oxygen species (•O 2 − and •OH). Tribo-generated holes were identified as the primary reactive species responsible for RhB degradation, surpassing the contributions of •O 2 − and •OH. A preliminary reaction mechanism based on both electron transfer and electron citation was proposed. The solid-phase reduction method employed in this study presents a promising way for enhancing tribocatalytic performance by introducing oxygen vacancies.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaoxiao Zhou,Xiaoyan Peng,Haoyu Xu,Yijin Hao,Hezhang Li,Bo-ping Zhang
BiFeO 3 -BaTiO 3 (BF-BT) ceramics are an excellent choice for high-temperature lead-free piezoelectric ceramic due to their high Curie temperature and good piezoelectric properties , but the volatilization of Bi leads to the formation of A-site cationic vacancies and oxygen vacancies , culminating in heightened leakage currents and detrimental effects on piezoelectric properties. In this study, a chemical composition of 0.70Bi (1+ x ) Fe 0·97 Al 0·03 O 3 -0.30BaTiO 3 ceramics, abbreviated as B 1+ x FA-BT, where 0 ≤ x ≤ 0.05, were synthesized, with special attention on the effects of Bi compensation and poling process on their insulation and piezoelectric properties. Due to the coexistence of R - PC phases and low leakage current, B 1+ x FA-BT ceramics exhibit excellent piezoelectric properties and high Curie temperature, among which the B 1.02 FA-BT ceramic boasts optimal overall properties: d 33 = 196 pC N −1 , T C = 480 °C, k p = 34%, θ max = 49.5° and Q m = 32, under optimal poling parameters E p = 50 kV cm −1 and T p = 100 °C. The poling process is directly linked to the reorientation of domains, the redistribution of positive/negative space charge and the aggregation or injection of holes, which is achieved by tuning the poling field and temperature in a ceramic with optimal integrated piezoelectric properties. The poling process of BF-BT ceramics is significantly influenced by their leakage characteristics, which can have a significant impact on their overall performance. Optimizing electrical poling conditions and minimizing leakage current is crucial to achieving favorable piezoelectric properties in BF-BT ceramics with R - PC coexisting structures.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
IET Nanodielectrics
·
2023
·Vol. 6
·期 3
·159-164
·
IF 2.7
Ming-Sheng Zheng,Wei-Wei Lu,Xing Yang,Zhi-Min Dang
The significant progresses of polymer-based nanocomposites with improved dielectric performances are urgently calling for an effect way to realise commercial production. Up to now, the biaxial stretching technology is still a powerful method to produce the high-performance dielectric films applied in the film capacitors due to its full-blown applications. In this work, a classical composite system of BaTiO 3 /polypropylene was applied to reveal the connection between the microstructure changes and dielectric properties of the corresponding nanocomposite films in the biaxial stretching process. The permittivity of BT-30 wt% nanocomposite reached 2.8 at 10 3 Hz after stretching, and its breakdown strength reached 340 MV/m. In addition, the breakdown strength of BT-10 wt% nanocomposite could even be promoted to 452 MV/m, which was 1.3 times higher than that before stretching. The microstructure test demonstrated that the rearrangement of nanofillers, high crystallinity and the oriented polypropylene crystals were advantageous to the improvement of breakdown strength for the stretched nanocomposite films. Therefore, the application of biaxial stretching technology into the preparation of nanocomposite dielectric film is an enormous potential way for the energy storage film capacitors.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）