ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Enzhu Lin,Ni Qin,Jiang Wu,Baowei Yuan,Zihan Kang,Dinghua Bao
Powder-form piezocatalysts suffer from poor recyclability and pose a potential threat of creating serious secondary pollution, which restrict their practical applications. Thin-film piezocatalysts, which not only exhibit good recyclability but also fully contact with solution, are believed to be one of the solutions to address these problems. In this work, the nanostructured BaTiO3 (BTO) thin films were fabricated by a facile hydrothermal method for their potential applications in piezocatalysis. The vertically standing BTO nanosheets grown on the top of TiO2 nanorod arrays exhibited superior piezocatalytic performance as well as piezo-electrochemical property. Given the different strain states between thin-film piezocatalyst and powder-form piezocatalyst, both the impact force of water and isostatic pressure are taken into consideration in finite element method (FEM) simulation. The FEM simulation shows that a stronger piezoelectric filed can be built in BTO nanosheets because of their easier deformation, and thus can lead to a higher piezocatalytic degradation efficiency. Our work presented here is expected to provide a potential route for the nanoengineering of thin-film piezocatalysts and clarify the catalytic mechanism for substrate-fixed piezocatalysts.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 12
·7065-7072
·
IF 3.119
Jianxin Zhang,Jiachen Ma,Luqing Zhang,Chuanyong Zong,Anhou Xu,Yabin Zhang,Bing Geng,Shuxiang Zhang
The introduction of ceramic fillers into a polymer matrix is an effective way to obtain dielectric nanocomposites with high energy storage density. However, the inorganic fillers are difficult to disperse evenly into the polymer matrix because of the poor compatibility, which stems from the large surface energy difference and the mismatch in dielectric constant between the fillers and polymer matrix. Polymer nanocomposites with high dielectric constant while maintaining high breakdown strength have great potential to achieve high energy storage density. In this work, poly(dodecafluoroheptyl methacrylate) terminated with a thiol end group (PDFMA-SH) was synthesized via a two-step process including Reversible Addition-Fragmentation Chain Transfer (RAFT) polymerization and subsequent aminolysis reaction. The polymer was then grafted into the surface of BaTiO3 (BT) nanoparticles by a “thiol–ene” click reaction to reduce the surface energy of BT nanoparticles. A novel nanocomposite consisted of the core–shell structured PDFMA@BT hybrid nanoparticles and poly(vinylidene fluoride–chlorotrifluoroethylene) (P(VDF–CTFE)) matrix was prepared. The influence of the fluoropolymer shell on the dispersion of fillers, the compatibility between the fillers and polymer matrix, dielectric properties and breakdown strength were investigated systematically. The results indicate that the strong interfacial adhesion between the hybrid nanoparticles and P(VDF–CTFE) matrix makes the fillers uniformly dispersed in the polymer matrix. Meanwhile, the excellent compatibility between the two components is favorable for enhancing the breakdown strength and suppressing dielectric loss, providing a condition to prepare dielectric materials with high energy storage density.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Materials
·
2023
·
IF 3.2
Ye Chao,Li Chengui
A type II band aligned BaTiO3/CeO2 photocatalysts was constructed by a simple one-step solution synthesis method. The BaTiO3/CeO2 photocatalysts contain only cubic phase BaTiO3 and CeO2, and the particles are approximately spherical with a small amount of adhesion and agglomeration, and the average particle size is about 50 nm. Transmission electron microscopy (TEM) observation and element Mapping characterization confirmed the formation of special heterojunction between BaTiO3 and CeO2 and the presence of a large number of oxygen vacancies, which resulted in high visible optical absorption coefficient. The BaTiO3/CeO2 photocatalysts demonstrated high photocatalytic activity for the degradation of oxytetracycin hydrochloride, and the optimal drug concentration, catalyst content and pH value are 50 mg/L, 1 g/L and 7, respectively. Simultaneously, the BaTiO3/CeO2 photocatalysts were selective for degradation of aureomycin hydrochloride, doxycycline hydrochloride and tetracycline hydrochloride. Other photocatalytic experiments show that the BaTiO3/CeO2 photocatalysts have high chemical and cyclic stability, and the synergistic effect of holes, hydroxyl radicals and superoxide radicals plays an important role in the whole photocatalytic process. This simple synthesis route provides a technical reference for constructing other wide-band gap semiconductors to respond to simulated sunlight.
研究领域:
材料科学
·
环境科学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuangqian Ma,Zhongyang Wang,Lan Yang,Danning He,Ming Yang,Liping Tong,Xiao Zhou,Tongxiang Fan
Ceramics with low solar absorptivity and high infrared emissivity play an important role in radiative cooling applications. BaTiO 3 , for instance, is one promising radiative cooling ceramic, although it has been mainly explored only in electronics. In this work, the solar-reflective and infrared-radiative properties of Sr-doped BaTiO 3 are studied systematically. Ba 1- x Sr x TiO 3 ( x = 0, 0.2, 0.25, 0.3, 0.35) ceramics synthesized by sol-gel method were investigated in terms of their microstructure, phase transition, and optical properties . Increasing infrared emissivity and solar absorptivity were observed with increasing Sr content. The optimized Ba 1- x Sr x TiO 3 achieves solar absorptivity of 0.17 and infrared emissivity of 0.78. The lowest absorptivity-emissivity ratio of 0.24 was observed for Ba 0.8 Sr 0.2 TiO 3 . Meanwhile, the solar absorptivity and infrared emissivity exhibited temperature stabilization, even affront heat-induced phase transition. Finally, the coupling relation between band gap, Ti–O vibration, and optical properties of Ba 1- x Sr x TiO 3 ceramics are clarified, which is promising to improve their radiative cooling performance.
研究领域:
材料科学
·
光学
·
热能工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Chenjie Fu,Nan Chen,Guoping Du
Effects of Ni 2+ doping at A and B sites of BaTiO 3 ceramics on the crystal structures, microstructures, chemical bonding characteristics and dielectric and ferroelectric properties were studied. Both the A-site doped Ba 1−x Ni x TiO 3 and B-site doped BaTi 1−x Ni x O 3 ceramics ( x = 0, 0.01, 0.03, 0.05, 0.08 and 0.10) were prepared using the solid state reaction method at 1300 °C. For Ni 2+ doping at A sites, no change in the crystal structure of Ba 1−x Ni x TiO 3 was observed. The Ba 1−x Ni x TiO 3 ceramics remained to be of tetragonal structure, but their tetragonality consistently decreased with x . For Ni 2+ doping at B sites, a change in the crystal structure from tetragonal to hexagonal was observed for the BaTi 1−x Ni x O 3 ceramics. The hexagonal structure started to appear when x = 0.03, and BaTi 1−x Ni x O 3 ceramics completely transformed from tetragonal to hexagonal structure when x =0.08. Ni 2+ doping introduced more oxygen vacancies to Ba 1−x Ni x TiO 3 and BaTi 1−x Ni x O 3 , and the latter had higher concentration of oxygen vacancies. It was found that Ni 2+ doping, either at A or B sites, strongly decreased their dielectric and ferroelectric properties. The Ba 1−x Ni x TiO 3 ceramics remained to be ferroelectric for x up to 0.10, although it was weak, while the BaTi 1−x Ni x O 3 ceramics became paraelectric when x = 0.03. The Ba 1−x Ni x TiO 3 ceramics exhibited higher dielectric constant than the BaTi 1−x Ni x O 3 .
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2021
·
IF 3.627
Dayi Jiao,Fuming Chen,Shaofeng Wang,Yinzhen Wang,Wei Li,Qinyu He
SnS 2 was hybridized with BaTiO 3 to form an efficient and cheap Z-scheme heterojuncted SnS 2 /BaTiO 3 photocatalyst by depositing nanosized SnS 2 on the surface of commercial micro-sized BaTiO 3 . Multiple characterization techniques have been employed to study the as-prepared samples. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) results reveal that SnS 2 partly covers BaTiO 3 . The photoluminescence (PL) spectra and the electrochemical impedance spectroscopy (EIS) investigation exhibit that the heterojunction SnS 2 /BaTiO 3 has improved the separation and transfer of the photogenerated electron-hole pairs. UV–Vis-DRS and Mott-Schottky measurement give the estimated E g , E CB , and corresponding calculated E VB , which meet the requirements of Z-scheme. The photocatalytic efficiency (degradation is 98% within 20 min) has been greatly enhanced much higher than pure SnS 2 . Free radical trapping experiments indicates that superoxide (•O 2 − ) is the dominant active species of the reaction system. The improved photocatalytic performance, as well as the free radical trapping experiments support the Z-scheme mechanism for composite photocatalyst SnS 2 /BaTiO 3 . This work reveals that Z-scheme composite SnS 2 /BaTiO 3 has prospect in treating organic pollution in waste water.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yu Liu,Ting Chen,Jian Zheng,Zhijia Zhu,Zhangmi Huang,Chunyan Hu,Baojiang Liu
Using piezoelectric materials for advanced oxidation is a green and viable means of water purification and environmental restoration. However, unmodified piezoelectric catalysts exhibited unsatisfactory catalytic performance, which had become a bottleneck for the practical application of piezoelectric catalysis. In this work, piezoelectric responsiveness and exposed active crystal surface area were rationally coordinated by synthesizing one-dimensional BaTiO 3 nanorods (BTO NRs). Enhanced piezo-responsivity enables faster free charge carriers transfer, while the highly exposed area of the (0 0 1) facets provides more active sites for piezo-catalytic reactions. Consequently, BTO NRs degraded RHB (Rhodamine B) and TC (Tetracycline) with first-order rate constants of 0.018 min −1 and 0.012 min −1 , respectively, 5 times higher than BaTiO 3 nanoparticles. The specific active sites on the (0 0 1) crystal plane were further investigated through a combination of DFT calculations, free radical trapping experiments, and XPS analysis. Ti 4+ adsorbs and activates water molecules to generate Ti 3+ and •OH, in the catalytic reaction. Afterward, Ti 3+ is oxidized to Ti 4+ by piezo-holes (holes driven by piezoelectric potential), while •OH is desorbed and involved in the degradation of pollutants. This research not only provides an approach to modify piezoelectric catalysts with high catalytic activity but also presents new insights into the mechanism of piezoelectric catalysis from the viewpoint of the atom level.
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
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Hai-Yan Wang,Yan-bin You,Jun-Wei Zha,Zhi-Min Dang
For present ceramic particles/polymer dielectric composite materials, their dielectric properties and thermal conductivity haven't met the application requirement at the same time. In this research, to achieve this goal, barium titanate@super short MWCNTs (BT@SSCNT) core-shell particle was prepared in a confinement reactive space built by water phase and oil phase. Polyvinylidene fluoride (PVDF) based composite flexible films reinforced by the BT@SSCNT particles possessed desired dielectric and excellent thermal behaviors. Especially for the composite film with 60 wt% (containing less than 17 wt% SSCNT) loading, at 10 2 Hz and in the wide temperature range of −40–140 °C, dielectric constant and dielectric loss varied from 476 to 764 and from 2.74 to 4.58, respectively. Meanwhile the thermal conductivity of this film reaches 25.43 W/(m K). The promising dielectric properties and high thermal conductivity of the films are attributed to multiple roles of SSCNT shell layer including external electric field applying on BT particles, tremendous interfacial polarization area, restricted electron motion and electron efficient in transporting heat. The BT@SSCNT/PVDF composite films can be a promising candidate for the modern electronic industry.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 6
·3735-3742
·
IF 2.1
Yizhou Xiao,Yuanbo Yang,Shuai Yang,Jinglei Li,Dan Liu,Jie Wu,Mingwen Wang,Chunchun Li,Fei Li
Modified BaTiO 3 ceramics that possess high dielectric permittivity and acceptable temperature stability have been widely utilized as multilayer ceramic capacitors (MLCCs) for high-frequency bypass and power filtering in automotive applications. However, since the increasing demand for high-capacity and small-size, high-permittivity materials that can serve as dielectric layers in MLCCs are urgently required. In this work, we design and fabricate a special BaTiO 3 -0.03Mg-0.02Y-0.02CaZrO 3 ceramic with a high dielectric permittivity of 3000 and the dielectric variation below ±13% in the temperature range of -55–150°C, fulfilling the requirements of X8R capacitors. To achieve these results, we employed grain size engineering and cation doping, using BaTiO 3 precursors with a particle size of 240 nm to prepare the BaTiO 3 -based ceramics with fine grains, while Mg and Y co-doping was used for improving the temperature stability due to dielectric dispersion. Utilizing these high-permittivity BaTiO 3 -based materials, we fabricated MLCCs that satisfy the X8R criterion, possessing a high dielectric constant of 2950 and a high breakdown field (410 kV/cm).
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 ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Li-Feng Zhu,Bo-Ping Zhang,Shun Li,Gao-Lei Zhao
The (1- x )Bi 1+ y (Fe 0.96 Mg 0.02 Ti 0.02 )O 3 - x BaTiO 3 (abbreviated as B 1+ y FMT- x BT) system was designed to explore the morphotropic phase boundary (MPB) separating rhombohedral ( R ) and tetragonal ( T ) phases, and the mechanism of performance enhancement. The phase structure of samples was discreetly investigated by X-ray diffraction, and Rietveld refinement results of the XRD data revealed that the B 1+ y FMT- x BT ceramics consist of an R phase at x = 0.24, two R and T phases at 0.26 ≤ x ≤ 0.32, and a single T phase at x = 0.34. Because of the MPB and the improvement of resistivity with adding excess Bi compensation, excellent piezoelectric properties of d 33 = 198 pC/N and k p = 30.9%, as well as high Curie temperature T C = 497 °C were achieved in the B 1+ y FMT- x BT system at x = 0.30 and y = 0.02. Here, the large d 33 = 198 pC/N which is the maximum value for the BF-BT-Bi(Mg,Ti)O 3 system so far, and high T C = 497 °C suggest that Bi(Fe,Mg,Ti)O 3 -BaTiO 3 ceramics have good prospects in high-temperature piezoelectric devices.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhen Wang,Jianping Xu,Shaobo Shi,Jing Chen,Jianghua Xu,Lina Kong,Xiaosong Zhang,Lan Li,Shougen Yin
One-dimensional (1D) metal oxides with excellent carrier transport and light absorption properties can be applied to photodetectors (PDs), facilitating device miniaturization, portability, and integration. Surface modification of 1D semiconductors can reduce carrier recombination in PDs as a way to increase photocurrent and decrease dark current of PDs. Herein, ultrathin BaTiO3 (BTO) shell layers are grown on the surface of TiO2 nanorod arrays (NRs) by in situ conversion using hydrothermal reaction, and the self-powered TiO2-BTO NRs PDs are constructed. The effect of the thickness of BTO shell layers on the photoresponse characteristics of self-powered TiO2-BTO NRs PDs is investigated by controlling the Ba2+ conversion concentration. The results show that the BTO shell layer reduces the dark current of the PDs because of the decreased interfacial transfer resistance and improved transfer of photogenerated carriers for building a “bridge” of carrier transport between BTO and TiO2 due to the formation of Ti–O–Ti bonds. Moreover, the presence of the spontaneous polarization electric field in BTO enhances the photocurrent and response speed of PDs. The self-powered TiO2-BTO NRs PDs are integrated in series and parallel to realize the functions of “and” and “or” gates of light-controlled logic gates. The ability to convert light signals into electrical signals for the self-powered PDs in real time demonstrates its great potential for optoelectronic interconnection circuits, which has important application prospects in the field of optical communication.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Xiaoguang Qiao,Yu Zhang,Junle Zhang,Ge Shi,Yanjie He,Xinchang Pang
Compared with other stimulus such as light and heat, ultrasonic possesses much deeper penetration into tissues and organs and has lower scattering in heterogeneous systems as a noninvasive stimulus, and has already been used as the external stimulus to initiate reversible-deactivation radical polymerization (RDRP). However, the development of efficient ultrasonic drive RDRP in aqueous dispersed media remains a challenge. Here in this work, ultrasonic driven piezoelectric induced miniemulsion atom transfer radical polymerization (Piezo-miniATRP) was performed, with tetragonal BaTiO 3 (BTO) nanoparticles as the piezoelectric catalyst. The Piezo-miniATRP exhibited features of controllable and livingness, such as linear increase of molar mass and narrow molar mass distributions ( M w / M n < 1.30). The effect of different polymerization parameters on the polymerization reaction was investigated, including the amounts of surfactant, CuBr 2 and BTO dosages. Excellent temporal control of the polymerization and the chain fidelity of polymers were illustrated by “ON and OFF” experiment and chain extension, separately. This novel BTO catalyzed Piezo-miniATRP process could also be extended to other aqueous dispersion RDRP systems.
研究领域:
材料科学
·
化学工程
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）