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
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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
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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
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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
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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
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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
ACS Nano
·
2024
·
IF 15.8
Bei Li,Min Lv,Yujia Zhang,Xueqin Gong,Zaizhu Lou,Zeyan Wang,Yuanyuan Liu,Peng Wang,Hefeng Cheng,Ying Dai,Baibiao Huang,Zhaoke Zheng
Piezoelectric-assisted photocatalysis has a huge potential in solving the energy shortage and environmental pollution problems, and imaging their detailed charge-transfer process can provide in-depth understanding for the development of high-active piezo-photocatalysts; however, it is still challenging. Herein, topotactic heterostructures of TiO2@BaTiO3 (TO@BTO-S) were constructed by the epitaxial growth of ferroelectric BaTiO3 mesocrystals on TiO2-{001} facets, resulting in a ferroelectric photocatalyst with a polarization orientation on the surface. Notably, the photoinduced charge transfer in ferroelectric TiO2@BaTiO3 was accurately monitored and directly visualized at the single-particle level by the advanced photoluminescence (PL) imaging microscopy systems. The longer PL lifetime of TO@BTO-S demonstrated the efficient charge separation caused by a built-in electric field, which is constructed by the polarization orientation of BaTiO3 mesocrystals. Therefore, the TO@BTO-S heterostructure exhibits efficient piezoelectric-assisted photocatalytic pure water splitting, which is 290 times higher than photocatalysis. This work revealed time/spatial-resolved photoinduced charge transfer in piezoelectric assistance photocatalysts at the single-particle level and demonstrated the great role of polarization orientation in promoting charge transfer for photocatalysis.
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 Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Li Li,Lin Yang,Yuli Xiong,Li Peng,Hongmei Dong,Xijun Wei,Peng Xiao,Huichao He
Introducing a built-in electric field into the photoelectrochemical system is considered as an effective strategy to tune interfacial energy band bending and manipulate charge transport direction. Here, we design the hybrid ferroelectric-semiconductor structure photoanodes for water oxidation, and the BaTiO3 (BTO) is used for ferroelectric while monoclinic WO3, tetragonal TiO2, and triclinic CuWO4 for the semiconductors, respectively. After the positive poling, 3 wt % BTO–WO3 and 3 wt % BTO–CuWO4 hybrid photoanodes perform a significantly enhanced photocurrent of 68.5 and 62.9% compared with the pristine semiconductors. The efficiencies of charge separation and oxidation kinetics of these hybrid photoanodes increase by 14–19% and 1.38–1.42 fold, and the electron transport time decreases by 16%. Further, Kelvin probe force microscopy measurements indicate that the surface potential of the hybrid structure is lower than unmodified samples, suggesting that the space charge region near the semiconductor surface has been changed and an outside built-in electric field is induced by the positive polarized ferroelectric. This vector of the electric field has a facilitating effect on band bending of the interface, especially on the semiconductor with the lower Fermi level, and the more upward bending can accelerate the photogenerated holes to migrate to the surface where the water oxidation take place.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Xiaolin He,Biyun Lin,Liqin Yang,Chaoqun Shang,Shanshan Li,Zhihong Chen,Xin Wang
As an ideal photocatalyst in the photoelectrochemical (PEC) water oxidation area, hematite (α-Fe2O3) has received much attention from scientists on account of its favorable band gap and excellent stability in alkaline media. However, the practical photocurrent yield of α-Fe2O3 is much less than the theoretical value because of the high charge recombination and the low charge transport. Herein, a novel ferroelectric Fe2O3/Pb(Zr0.2Ti0.8)O3 photoanode (Fe2O3/PZT) was fabricated by simple spin coating along with a one-step calcination method for the first time. As expected, the Fe2O3/PZT photoanode showed a significantly greater photocurrent (by ∼10 times) and the initial potential (by ∼100 mV) was more negative than that of the pure Fe2O3 nanorod photoanode, which was attributed to the depletion layer width increase and the upward band bending in Fe2O3 induced by ferroelectric polarization of PZT, leading to efficient charge separation and injection. Moreover, the photoelectrochemical performance of the Fe2O3/PZT nanorod photoanode could be regulated by simply changing the polarization direction of PZT. In addition, the Fe2O3/PZT nanorod photoanode showed not only a fast and repetitive light response but also long-term stability for 96 h. This research presents a novel route to enhance the efficiency of charge separation and affords theoretical guidance for preparing the high-efficiency PEC photoanodes and the switchable control of the photoelectrochemical response.
研究领域:
材料科学
·
能源科学
·
光催化
✓ 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）