Journal of Physical Chemistry C
·
2023
·
IF 3.7
Miao Miao Zhao,Lei Meng,Yi Yang Xu,Na Du,Fei Yen
While all of the polymorphs of NH4I and NH4Br are nonpolar, a reversible electric polarization is established in the ordered γ phases of (NH4)0.73(ND4)0.27I and (NH4)0.84(ND4)0.16Br (where D is 2H) via dc electric fields. The presence of two groups of orbital magnetic moments appears to be responsible for the asymmetric lattice distortions. Our findings provide an alternative pathway for hydrogen-based materials to potentially add a ferroelectric functionality.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Functional Materials Letters
·
2023
·
IF 1.3
Pu Qin,Chengyan Zhu,Malik Ashtar,Ming Li,Yuan Liu,Mingming Chen,Dawei Cao,Ying Yang
ZnO is one of the most popular materials in UV photodetectors, but its low switching and long attenuation time seriously hinder its practical application. In this work, the performance of PZT/ZnO planar photodetectors is optimized by using the ferroelectric polarization of PZT thin films. The results show that the residual polarization field of PZT affects the electron arrangement in ZnO film, making ZnO in a depleted state, reducing the dark current of resulted photodetectors, and influencing the carrier life. By inhibiting recombination, the photocurrent is increased, and the switching ratio of the ZnO photodetector is increased by 5 times, and more importantly, the optical responsivity increases by 7 times to 1.015 A/W. This work provides a simple and feasible method for ferroelectric polarization to control the performance of two-dimensional material photodetectors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Meixia Wu,Yifeng Han,Xiang Zhou,Xihui Liang,Shuang Zhao,Man-Rong Li
Controlling and modulating the magnitude and signs of electric polarization in multiferroics are very important for practical applications. The magnetoelectric effect in multiferroic materials enables the control and tailor of electric polarization by a magnetic field or vice versa . However, there are rare investigations about the mutual control of the magnitude and signs of electric polarization in multiferroics . Here, we successfully synthesized single crystals of Y-type hexaferrites Ba 0.8 Sr 1.2 Co 2 Fe 12- x Al x O 22 ( x = 0 and 1.08) via flux method. The magnetization, magnetodielectric and magnetoelectric properties were investigated. We found that Al-doping increased the conical magnetic structure transition temperatures and enhanced the magnetoelectric properties. Most importantly, both samples exhibited reversal and non-reversal polarizations at low and high temperatures, respectively. In addition, Al-doping can stabilize the non-reversal ferroelectric polarization, possibly originating from the different field-dependent magnetic structure transitions.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Research
·
2024
·
IF 8.5
Xi Chen,Xianghong Liu,Mohd Yasir Khan,Zuyao Yan,Dezhou Cao,Shifang Duan,Lingshan Fu,Wei Wang
Colloidal molecules, ordered structures assembled from micro- and nanoparticles, serve as a valuable model for understanding the behavior of real molecules and for constructing materials with tunable properties. In this work, we introduce a universal strategy for assembling colloidal molecules consisting of a central active particle surrounded by several passive particles as ligands. During the assembly process, active particles attract the surrounding passive particles through phoresis and osmosis resulting from the chemical reactions on the surface of the active particles, while passive particles repel each other due to the electric polarization induced by an alternating current (AC) electric field. By carefully selecting particles of varying structures and sizes, we have assembled colloidal molecules of symmetric and asymmetric dimers, trimers, and multimers. Furthermore, the coordination number of these colloidal molecules can be regulated in real time and in situ by tuning the interaction forces between the constituent particles. Brownian dynamics simulations reproduced the formation of the colloidal molecules and validated that the self-assembly arises from chemically induced attraction and electrical dipolar repulsion. This strategy for reconfigurable colloidal assemblies poses the potential for designing adaptive micro-nanomachines.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Lingfang Xu,Yu Zhang,Chi Gui,Hanshuo Fang,Ruilong Wang,Haibo Xiao,Shiheng Liang,Changping Yang
BiFeO 3 has been extensively studied as an important single-phase multiferroic material at room temperature in the application fields of energy storage, data storage, spintronics, and electro-magnetic sensors. However, the high leakage current caused by the presence of lattice defects such as vacancies constrains the further development of BiFeO 3 . In this paper, we presented a facile method to overcome the high leakage problem via blending BiFeO 3 nanoparticles into the ferroelectric copolymer PVDF-TrFE matrix and introducing a barrier layer beneath the top Pt dot electrode. The leakage current and ferroelectric characteristics of BiFeO 3 _PVDF-TrFE nanocomposite films were discussed comprehensively. Consequently, compared with the composites without the barrier layer, the leakage current density of the BiFeO 3 _PVDF-TrFE composite films reduced two orders of magnitude after coating a pure copolymer layer. Moreover, the remnant ferroelectric polarization reached ~14 μC cm −2 for a moderate weight content (25 wt%) of BiFeO 3 nanoparticle in the blends, with a remarkably smaller coercive electric field than that of pure PVDF-TrFE films. An electrical conduction blocking mechanism was established to elucidate the optimized electric and ferroelectric properties of nanocomposite films.
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
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chengjun Li,Wang Li,Chengwei Sun,Zheng Ma,Yingchao Wei,Wenyuan Ma,Boyu Yang,Xin Li,Yubo Luo,Junyou Yang
Bi2Te3-based thin films are gaining recognition for their remarkable room temperature thermoelectric performance. Beyond the conventional “process–composition–performance” paradigm, it is highly desirable to explore new methods to enhance their performance further. Here, we designed a sandwich-structured Ag/PZT/PVDF/Bi0.5Sb1.5Te3(BST) thin film device and effectively regulated the performance of the BST film by controlling the polarization state of the PZT/PVDF layers. Results indicate that polarization induces interlayer charge redistribution and charge transfer between PZT/PVDF and BST, thereby achieving the continuous modulation of the electrical transport characteristics of BST films. Finally, following polarization at a saturation voltage of 3 kV, the power factor of the BST film increased by 13% compared to the unpolarized condition, reaching 20.8 μW cm–1 K–2. Furthermore, a device with 7 pairs of P–N legs was fabricated, achieving a cooling temperature difference of 11.0 K and a net cooling temperature difference of 2.4 K at a current of 10 mA after the saturation polarization of the PZT/PVDF layer. This work reveals the critical effect of introducing ferroelectric layer polarization to achieve excellent thermoelectric performance of the BST film.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 10
·2044-2054
·
IF 4.8
Zhou Min,Liang Laijun,Lu Dingze,Lu Xiaomei,Wang Zheng,Huang Fengzhen,Cheng Pengfei,Liu Dongdong,Tian Mengqi,Wang Qiuping,Zhang Yunjie
Piezocatalysis has attracted unprecedented research interest as a newly emerging catalysis technology. However, the inherent insulating property of ferroelectric materials ultimately leads to the poor vibration–electricity conversion ability. Herein, this work reports the (K 0.52 Na 0.48 )NbO 3 ferroelectric ceramics (KNNFC x ), for which the FeCo modification strategy is proposed. The substitution of the moderate amount of FeCo ( x = 0.015) at Nb site not only optimizes ferroelectricity but also produces beneficial defects, notably increasing Rhodamine B water purification efficiency to 95%. The pinning effect of monovalent oxygen vacancies on ferroelectric domains is responsible for the excellent ferroelectric polarization of KNNFC0.015 through the generation of an internal field to promote charge carriers separation and reduce non-radiative recombination. Importantly, the accompanying electron carriers can easily move to the material surface and participate in redox reactions because they have low activation energy. Therefore, ferroelectric polarization and defects play synergetic roles in enhancing piezocatalytic performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 21
·期 1
·532-543
·
IF 2.1
Peixiaokan Si,Peng Zheng,Xinzhong Zhang,Chong Luo,Xiangting Zheng,Qiaolan Fan,Wangfeng Bai,Jingji Zhang,Liang Zheng,Yang Zhang
Developing dielectric ceramics with high energy storage performance (ESP) is essential for miniaturizing and integrating high-power pulse capacitors. Sr 2 NaNb 5 O 15 -based tungsten bronze ferroelectric ceramics have been highly investigated for dielectric energy storage applications recently. However, the difficulty in concurrently obtaining large polarization and strong relaxor characteristics greatly hinders the ESP improvement. In this work, Bi 3+ and Ti 4+ ions were introduced into the Sr 2 NaNb 5 O 15 ceramic, aiming to modulate the ferroelectric polarization and relaxor behavior synergistically. An excellent recoverable energy density ( W rec ∼ 4.08 J/cm 3 ) and a high efficiency ( η ∼ 84.59%) were concurrently attained in the Sr 1.85 Bi 0.15 NaNb 4.85 Ti 0.15 O 15 composition due to the boosted polarization and enhanced relaxor nature. Moreover, this ceramic also exhibited a high current density (863.06 A/cm 2 ) and a large power density (94.94 MW/cm 3 ). All these characteristics demonstrate that the Bi 3+ and Ti 4+ ions co-doped Sr 2 NaNb 5 O 15 ceramics possess great potential for dielectric capacitor applications.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 36
·期 1
·1-8
·
IF 2.8
Shan Zhang,Xin Song,Xing Gao,Chunxiao Lu,Pei Han,Yunying Liu,Xiaowei Li,Junyan Zhang,Yong Li
The ferroelectric photovoltaic (PE-PV) effect has been extensively explored and plays a crucial role in constructing self-powered photodetectors. Ferroelectric materials have been attracting great interest in self-powered ultraviolet (UV) photodetectors due to their polarization-induced photovoltaic effect. In this paper, the ultraviolet self-powered photodetection properties of polycrystalline rare-earth Yb 1-x Ho x MnO 3 (0 ≤ x ≤ 0.08, Δx = 0.02) ferroelectric materials have been investigated. The substitution of Ho atoms for Mn atoms has a great influence on the ferroelectric polarization, and Ho doping increases the photocurrent density. The photodetectors show excellent reproducibility responsivity (R) and detectivity (D*) under illumination at 365 nm. In addition, at the light density of 1 mW/cm 2 , the responsivity and detectivity of the photodetectors are as high as 0.09 W/A and 3.359 × 10 11 Jones, respectively. These outstanding photodetection performances are due to the relatively high short-circuit current density ( J sc ). High J sc implies that more photogenerated carriers can be produced under illumination, which makes the device more sensitive to optical signals. This study presents a feasible method for improving the light-detection performance of the ultraviolet self-powered detector.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Ming Song,Xihua Du,Yan Chen,Lei Zhang,Ding Zhu,Yungui Chen
Among all the factors that restrict the application of Li–air battery, large charging polarization, due to the poor bulk charge transport ability of discharge product Li 2 O 2 , comes first. In this paper, we adopt the method of controlling discharging temperature to reduce the charging polarization during the first cycle of Li 2 O 2 based on the fact that controlling discharging temperature can reduce Li 2 O 2 bulk charge transport path since finer Li 2 O 2 particles can be observed at higher temperature. The mechanism of reducing charging polarization simply through increasing the discharging test temperature has also been researched in this paper.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Yan Zhu,Xing Ji,Yuli Xiong,Jiangna Guo,Shuangrui Yao,Qingxin Lai,Ping Li,Yunhuai Zhang,Peng Xiao
Spontaneous polarization field in ferroelectric can improve the oxidation kinetics and photocurrent of a photoanode in photoelectrochemical water splitting. But the impact of ferroelectric polarization field on the migration of different charge carriers which have different mobility and diffusion length is still unknown. In this work, we synthesized tetragonal BaTiO 3 nanoparticles by solvothermal method successfully and fabricated the hybrid photoanode composed by monoclinic WO 3 and BaTiO 3 for solar water oxidation. Density functional theory calculations showed that the mobility of electron was faster than that of the hole in WO 3, and had a longer diffusion length. We demonstrated that the polarization field of ferroelectric had a greatly impact upon holes migration compared with electrons, thus the thin hybrid photoanode after poling by bias presented a significant improvement of photocurrent (210.5%) under the back-side illumination, and a remarkable augment of charge separation efficiency (94%) and oxidation kinetics (69%) at 1.23 V. Our work provided a deeper understanding of how ferroelectric polarization field affected the photoelectrochemical water oxidation and a general pathway towards enhancing minority carrier collection in photoanode.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 13
·2210296
·
IF 29.4
Jianfang Li,Xiangmei Liu,Yufeng Zheng,Zhenduo Cui,Hui Jiang,Zhaoyang Li,Shengli Zhu,Shuilin Wu
Bacteria-infected osteomyelitis is life-threatening without effective therapeutic methods clinically. Here, a rapid and effective therapeutic strategy to treat osteomyelitis through ferroelectric polarization interfacial engineering of BiFeO 3 /MXene (Ti 3 C 2 ) triggered by ultrasound (US) is reported. Under US, the ferroelectric polarization induces the formation of the piezoelectric field. US cavitation effect induced sonoluminescence stimulates BiFeO 3 /Ti 3 C 2 to produce photogenerated carriers. With synergistic action of the polarization electric field and Schottky junction, BiFeO 3 /Ti 3 C 2 accelerates the separation of electrons and holes and simultaneously inhibits the backflow of electrons, thus improving the utilization of polarized charges and photogenerated charges and consequently enhancing the yield of reactive oxygen species under US. As a result, 99.87 ± 0.05% of Staphylococcus aureus are efficiently killed in 20 min with the assistance of ultrasonic heating. The theory of ferroelectric ultrasonic interfacial engineering is proposed, which brings new insight for developing ferroelectric ultrasonic responsive materials used for the diagnosis and therapy of deep tissue infection and other acoustoelectric devices.
研究领域:
医学
·
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）