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
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 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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Shishi Xu,Yunxiang Zhang,Yu Wang,Jikun Chen,Chenliang Zhou,Zhichao Mu,Zhe Zhang,Jiali Zhang,Jue Wang,Qinfang Zhang
The development of efficient and stable photocatalysts is of great significance for tailoring energy crisis and environmental pollution. In this study, novelty Sillén-Aurivillius BaBi 4 TiNbO 11 Cl ferroelectric materials were successful synthesized. Results of characterizations exhibit high crystallinity of BaBi 4 TiNbO 11 Cl nanoplates with the less impurity phases were fabricated from NaCl/CsCl molten-salt method due to the sufficient precursor ionic diffusion. This layered crystal structure of BaBi 4 TiNbO 11 Cl nanoplates can promote the separation of photon-generated carriers, and thus its photocatalytic activity is 3.73 and 1.58 times higher than that of other samples, respectively. Since the distortions of [TiO 6 ] and [NbO 6 ] octahedron in [BiTiNbO 7 ] perovskite blocks cause the ferroelectric polarization in BaBi 4 TiNbO 11 Cl, the piezo-photocatalytic performance is also assessed by mechanical force from ultrasound. Further investigations on the piezo-photocatalytic mechanisms of BaBi 4 TiNbO 11 Cl nanoplates, the internal electric fields induced by ferroelectric polarization can promote the efficient separation of free charges effectively, which enhances the catalytic activities of about 4.74 times by the synergistic effect of visible light and ultrasonic excitations. This work focuses on revealing the differences of photocatalytic, piezocatalytic and piezo-photocatalytic mechanisms for BaBi 4 TiNbO 11 Cl nanoplates, which provides a reference to develop other efficient piezo-photocatalysts of Sillén-Aurivillius layered oxyhalide materials.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2024
·
IF 5.9
Fengjiao Quan,Guangming Zhan,Pengfei Xu,Xiaolan Chen,Wenjuan Shen,Falong Jia,Yun He,Jianfen Li
Nitrate (NO 3 – ) is a widespread pollutant in high-salt wastewater and causes serious harm to human health. Although electrochemical removal of nitrate has been demonstrated to be a promising treatment method, the development of low-cost electro-catalysts is still challenging. In this work, a phosphate modified iron (P-Fe) cathode was prepared for electrochemical removal of nitrate in high-salt wastewater. The phosphate modification greatly improved the activity of iron, and the removal rate of nitrate on P-Fe was three times higher than that on Fe electrode. Further experiments and density functional theory (DFT) calculations demonstrated that the modification of phosphoric acid improved the stability and the activity of the zero-valent iron electrode effectively for NO 3 – removal. The nitrate was firstly electrochemically reduced to ammonium, and then reacted with the anodic generated hypochlorite to N 2 . In this study, a strategy was developed to improve the activity and stability of metal electrode for NO 3 – removal, which opened up a new field for the efficient reduction of NO 3 – removal by metal electrode materials .
研究领域:
环境科学
·
电化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Bo Yang,Yanni Han,Gang Yu,Qiongfang Zhuo,Shubo Deng,Jinhua Wu,Peixin Zhang
Electrocoagulation (EC) technique was used to investigate the removal performance of aqueous perfluoroalkyl acids (PFAAs) with relatively high concentration as simulating the wastewater from organic fluorine industry. A comparison between iron and aluminum electrode was made to remove PFAAs with the similar electrolysis condition. Effective removal of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) was obtained by EC process, especially for Fe anode. Several key factors were studied to optimize the EC process using Fe electrode. At the optimal operating parameters including 25.0 mA/cm 2 of current density, 180 rpm of stirring speed, and 2 g/L NaCl as supporting electrolyte, more than 99% of PFOS could be removed with 0.25 mM of initial concentration after 50-min electrolysis. Additionally, the adsorptive removal of aqueous PFOS on iron hydroxide flocs during EC was also verified by Fourier transform infrared spectra. The investigation of removal efficiency for PFAAs with different carbon chain length after EC and the characteristic of zeta potential on Fe flocs indicated that the electrostatic adsorption was primarily responsible for the PFAAs sorption on the iron hydroxide flocs.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
K.M. Wang,J. Shu,S.J. Wang,T.Y. Hong,X.P. Xu,H.Y. Wang
Anode passivation is still a main challenge for the electrochemical generation of ferrate(VI, Fe(VI)), leading to the reduction of Fe(VI) production efficiency. In this study, cyclic voltammetry, scanning electronic microscopy, and electrochemical impedance spectroscopy were used to select better anode electrode configurations (iron wire, iron gauze, and iron coil). The results indicate that iron coil had the least degree of passivation. Different imposed current waveforms during the electrochemical generation of Fe(VI) were also investigated, and the iron coil imposed with square alternating current (AC) wave can mitigate the anode passivation, resulting in higher Fe(VI) production efficiency. The optimum conditions for the electrochemical generation of Fe(VI) were evaluated and the optimum temperature (40 ℃), current density (10 mA/cm 2 ), AC cycle period (15 s) and electrolyte concentrations (14 M NaOH) were identified. As a result, 0.12 mol/L Fe(VI) concentration and over 50% of current efficiency can be achieved after 3 h electrolysis. The generated Fe(VI) solution was further applied to oxidize doxycycline(DOX) and sulfadiazine(SDZ) as typical antibiotics. Over 80% of DOX can be removed at a Fe(VI) to DOX molar ratio of 5:1 (pH = 4–9), whilst a higher Fe(VI) to SDZ molar ratio of 20:1 (pH = 7) was needed to obtain 75% SDZ removal.
研究领域:
环境科学
·
电化学工程
✓ 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）