POLYMER COMPOSITES
·
2023
·Vol. 44
·期 10
·6773-6782
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IF 5.2
Yufan Ping,Weimin Xia,Jiahong Zhou,Xiaofang Zhang,Zhong Li
A lead-free tetragonal-phase (Ba 0.94 Ca 0.06 )(Ti 0.95 Zr 0.05 )O 3 (BCTZ) micro sheet is prepared by molten-salt growth method, which exhibits a polarizing behavior of relaxor ferroelectricity and possesses a high dielectric constant ( ε r ) of ~2400. Subsequently, the BCTZ sheet is evenly doped into ferroelectric copolymer P(VDF-TrFE)55/45 mol% with different mass fractions, and the flexible BCTZ/P(VDF-TrFE) composite films are prepared using a conventional solution casting process. ε r of BCTZ/P(VDF-TrFE) increases with the mass content of BCTZ, and reaches 23.8 in 20 wt% BCTZ sample. Meanwhile, at a high electrical field of 30 MV/m, the strain and electric field of BCTZ/P(VDF-TrFE) are in the opposite direction, indicating a negative value of piezoelectric strain coefficient ( d 33 ) caused by inverse piezoelectric effect. In addition, d 33 of different BCTZ/P(VDF-TrFE) films are fitted using a strain-electrical field curve, which firstly increases and then decreases with increases in BCTZ content. As such, a high d 33 of −47.3 pC/N is obtained in BCTZ/P(VDF-TrFE)15/85 wt% film. Thus, this research concerning the inverse piezoelectric effect may provide a reference for designing a piezoelectric composite using in transducers and actuators.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 8
·4119-4130
·
IF 3.784
Yu Huang,Liang Shu,Suwei Zhang,Zhen Zhou,Yue-Yu-Shan Cheng,Biaolin Peng,Lisha Liu,Yuanyuan Zhang,Xuping Wang,Jing-Feng Li
With the development of advanced electrical and electronic devices and the requirement of environmental protection, lead-free dielectric capacitors with excellent energy storage performance have aroused great attention. However, it is a great challenge to achieve both large energy storage density and high efficiency simultaneously in dielectric capacitors. This work investigates the energy storage performance of sol-gel-processed (K,Na)NbO 3 -based lead-free ferroelectric films on silicon substrates with compositions of 0.95(K 0.49 Na 0.49 Li 0.02 )(Nb 0.8 Ta 0.2 )O 3 -0.05CaZrO 3 - x mol% Mn (KNN-LT-CZ5- x mol% Mn). The appropriate amount of Mn-doping facilitates the coexistence of orthorhombic and tetragonal phases, suppresses the leakage current, and considerably enhances the breakdown strengths of KNN-LT-CZ5 films. Consequently, large recoverable energy storage density up to 64.6 J cm −3 with a high efficiency of 84.6% under an electric field of 3080 kV cm −1 are achieved in KNN-LT-CZ5-5 mol% Mn film. This, to the best of our knowledge, is superior to the majority of both the lead-based and lead-free films on silicon substrates and thus demonstrates great potentials of (K,Na)NbO 3 -based lead-free films as dielectric energy storage materials.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
Advanced Photonics Research
·
2022
·Vol. 3
·期 12
·2200197
·
IF 0
Heng Guo,Qingxian Zhao,Peng Ran,Jinping Chen,Yizhi Zhu,Qingsong Jiang,Yuling Tang,Zhenhua Zhang,Lei Song,Chunxiang Xu,Shouhua Luo,Zengliang Shi
Scintillator is a critical component to detect high-energy particles or rays, which is widely used in deep space exploration, security inspection, and nondestructive testing and medical diagnosis, such as X-ray imaging and computed tomography (CT). However, the wider application of traditional inorganic and organic scintillators is limited by the complex operation process or poor adaptability to changeable environment, and there remains a demand to develop green and stable scintillators with high sensitivity and low detection limit. Herein, the one-step preparation of lead-free perovskite Cs 3 Cu 2 I 5 scintillator film for high-definition X-ray imaging by conventional chemical vapor deposition method is reported. Cs 3 Cu 2 I 5 demonstrates good stability and bright-blue emission at 445 nm and superhigh photoluminescence quantum yield (85.14%). Importantly, upon X-ray irradiation, the Cs 3 Cu 2 I 5 perovskite film exhibits light yield (≈39 251 photons MeV −1 ) as high as two times of the commercially available Ce:LuAG single-crystal scintillator (≈22 000 photons MeV −1 ). Furthermore, the practical demonstration for a bamboo stick and insect specimens illustrates sensitive scintillation response to X-ray signals with superior linearity and high-quality images in X-ray photography and CT. Overall, Cs 3 Cu 2 I 5 film provides nontoxicity, high radioluminescence intensity, and good stability, it can be regarded as a competitive material for X-ray imaging.
研究领域:
材料科学
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医学影像
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辐射探测
✓ 已验证
DOI
International Journal of Applied Ceramic Technology
·
2025
·
IF 2.3
Yuou Yuan,Hengchang Nie,Zhiyan Guo,Jinghui Peng,Biao He,Genshui Wang,Shiguang Yan,Fanglin Du,Liang Shi,Xiaofei Qu,Shuai Zhang
Ferroelectric thin films have emerged as a research focus in recent years due to their outstanding performance and eco-friendliness. This study reports on the fabrication of high-quality 0.55Bi 0.5 Na 0.5 TiO 3 -0.45SrTiO 3 +0.5 mol% Mn+x mol% Co (BNT-ST-Mn-x%Co) thin films on LaNiO 3 /Si (100) substrates using the sol–gel and spin–coating techniques. Through comprehensive structural analysis using multiple techniques, including X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, we demonstrate that cobalt incorporation enhances both the breakdown strength and relaxation properties of these films. Notably, the BNT-ST-Mn-1%Co film exhibits exceptional characteristics, achieving a maximum polarization of 73.62 µC/cm 2 under an electric field of 900 kV/cm, coupled with a dielectric constant of 1119 at 1 kHz. The co-doping of cobalt and manganese yields films with high polarization intensity even at lower electric fields, showcasing promising potential for a wide range of applications.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2019
·Vol. 31
·期 44
·1904711
·
IF 25.809
Bo Yang,Lixiao Yin,Guangda Niu,Jun-Hui Yuan,Kan-Hao Xue,Zhifang Tan,Xiang-Shui Miao,Ming Niu,Xinyuan Du,Haisheng Song,Efrat Lifshitz,Jiang Tang
Scintillators are widely utilized for radiation detections in many fields, such as nondestructive inspection, medical imaging, and space exploration. Lead halide perovskite scintillators have recently received extensive research attention owing to their tunable emission wavelength, low detection limit, and ease of fabrication. However, the low light yields toward X-ray irradiation and the lead toxicity of these perovskites severely restricts their practical application. A novel lead-free halide is presented, namely Rb 2 CuBr 3 , as a scintillator with exceptionally high light yield. Rb 2 CuBr 3 exhibits a 1D crystal structure and enjoys strong carrier confinement and near-unity photoluminescence quantum yield (98.6%) in violet emission. The high photoluminescence quantum yield combined with negligible self-absorption from self-trapped exciton emission and strong X-ray absorption capability enables a record high light yield of ≈91056 photons per MeV among perovskite and relative scintillators. Overall, Rb 2 CuBr 3 provides nontoxicity, high radioluminescence intensity, and good stability, thus laying good foundations for potential application in low-dose radiography.
研究领域:
材料科学
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辐射探测技术
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Guangsheng Zeng,Wei Weng,Shuiping Zhong,Xiaopeng Chi,Jiaozhong Cai,Wen Tan,Junnan Chen
The novel amidoxime-based collectors, 4-pyridylamidoxime (PA), 3-ethyl-4-pyridylamidoxime (EPA), and 3-methyl-5- tert -butyl-4-pyridylamidoxime (MBPA), were introduced in the lead-free flotation separation of wolframite from quartz and calcite. Compared with PA, EPA, and the traditional collector benzohydroxamic acid (BHA), MBPA exhibited a better separation and recovery capacity to wolframite ore. 4.0 × 10 -4 mol/L MBPA recovered more than 80 % wolframite, ∼24 % calcite, and ∼ 26 % quartz at pH 8.0 without Pb 2+ ions. Under the same conditions, BHA only floated out less than 35 % wolframite. The adsorption amount results exhibited a stronger adsorption ability of MBPA than BHA on wolframite surface. Further, the results of zeta-potential, FTIR, XPS and density functional theory (DFT) calculation revealed that MBPA could chemisorb on wolframite surface to form −N-Fe and −O-Fe bonds. MBPA had stronger electron-donating ability and weaker electron-accepting ability than BHA, which exhibited higher reaction activity. It was clear that MBPA was an excellent collector in the lead-free flotation separation of wolframite from calcite and quartz.
研究领域:
矿物加工工程
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材料化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 19
·195708
·
IF 2.9
Xiaofang Zhang,Ke Wang,Zhenyu Li,Juanjuan Qi,Dongke Li,Jianqiang Luo,Jian Liu
Recently, the lead-free double perovskite Cs2AgBiBr6 has been considered as a promising candidate for next-generation nonvolatile memory and artificial synapse devices due to its high stability and low toxicity compared to its lead-based counterparts. In this work, we developed a simple and effective method to produce high-quality lead-free double perovskite Cs2AgBiBr6 thin films without pinholes and particles by applying a low-pressure assisted method under ambient condition with a relative humidity (RH) of about 45%. The formation of pinholes and Ag precipitation in the perovskite Cs2AgBiBr6 films is effectively suppressed by the proper ratio of N,N-dimenthylformamide (DMF) mixed in dimethyl sulfoxide (DMSO) solvents. Furthermore, the grain size of the Cs2AgBiBr6 films can be significantly increased by increasing the post-annealing temperature. Finally, a sandwiched structure memristor with an ITO/Cs2AgBiBr6/Ta configuration was successfully demonstrated, featuring ultralow operation voltage (VSet ∼ 57 ± 23 mV, VReset ∼ −692 ± 68 mV) and satisfactory memory window (the ratio of RHRS/RLRS ∼ 10 times), which makes it suitable for low-power consumption information storage devices.
研究领域:
材料科学
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电子器件
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Junnan Wang,Zeyu Wang,Nikolai V. Gaponenko,Jindou Shi,Zheyuan Da,Chen Zhang,Yongqiang Ji,Qing Yao,Youlong Xu,Minqiang Wang
X-ray imaging technology has been integral to numerous aspects of people's lives since its inception. With the growing demand for advanced imaging technologies, lead-free metal halide perovskites have received significant attention due to their non-toxicity, stability, and excellent optical properties. This paper investigates the scintillation behaviour of a Te doped Cs2SnCl6 scintillator composite film (CF) prepared through an innovative in situ growth strategy. This approach achieves the direct growth of Cs2SnCl6:Te micro-crystals within polymethyl methacrylate (PMMA), mitigating the issues of optical property degradation and inhomogeneous distribution that are inevitable in a conventional two-step mixing method. By controllable optimization of the doping ratio of Te, the Cs2SnCl6:Te/PMMA CFs exhibited exceptional scintillation properties under X-ray irradiation, with the detection limit reaching up to 112 nGyairs−1. In X-ray imaging applications, the Cs2SnCl6:Te 15%/PMMA CF demonstrated advanced sensitivity, producing high-resolution structural images of the target object. This advancement highlights the promising potential of lead-free metal halide perovskites in the development and application of X-ray imaging technology.
研究领域:
材料科学
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医学影像
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光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Qinqiang Guo,Zhonghua Dai,Chenxi Liu,Yuanyuan Zheng,Xin Zhao,Weiguo Liu,Yu Cong,Shuitao Gu
The energy issue is currently a highly significant topic of concern, and the development of environmentally friendly and high-performance lead-free energy storage devices is fundamental to solving energy problems, but it also poses challenges. Lead-free environmentally friendly (Bi 0.5 Na 0.5 )TiO 3 [BNT] has attracted widespread attention due to its high polarization, but its low efficiency greatly affects its practical application. In this study, 1- x (Bi 0.5 Na 0.5 )TiO 3 - x Ca(Ti 0.8 Ta 0.16 )O 3 [1- x BNT- x CTT]ceramics were prepared to investigate the relationship between their microstructure and macro energy storage properties. With the introduction of CTT, the long-range order was broken, reducing the grain size; the introduction of high bandgap energy Ta 2 O 5 reduced residual polarization and improved the energy storage efficiency of the ceramics. Finally, high energy storage ( W rec = 3.01 J/cm 3 ) and high energy storage efficiency ( ƞ = 90 %) were achieved in the 0.7BNT-0.3CTT ceramics, and the breakdown field strength was increased to 350 kV/cm, with excellent discharge performance ( P D of 28.97 MW/cm 3 , t 0.9 of 1.9 μs). This study explores lead-free relaxor ferroelectric energy storage capacitors with high efficiency under high electric fields, providing a new approach to optimize the energy storage performance of ceramic energy storage devices.
研究领域:
材料科学
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能源存储
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2024
·
IF 6.8
Liu Hongjie,Sun Xue,Liu Jiaxin,Li Xiang,Hua Yunqiu,Yue Zhongjie,Song Jian,Wang Xilong,Yang Yujie,Lin Qianqian,Zhai Zhongjun,Tao Xutang,Zhang Guodong
Lead-halide perovskite single crystal (SC) heterojunctions have attracted significant attention for X-ray detection owing to their unique combination of high sensitivity, resolution, stability and low detection limit. However, the toxicity of lead in those perovskite heterojunctions limits their practical applications. Herein, we report the construction of the first all-inorganic lead-free Cs 2 AgBiBr 6 /Cs 3 Bi 2 Br 9 SC heterojunctions with an area of 20 × 20 mm 2 via a facile liquid-phase epitaxial method through temperature-lowering crystallization. The epitaxial crystallization of the three-dimensional (3D) Cs 2 AgBiBr 6 SC film on a 2D Cs 3 Bi 2 Br 9 SC substrate requires a large driving force for transitioning from the Volmer–Weber mode to the layer-by-layer growth mode under a rapid cooling rate. The Cs 2 AgBiBr 6 /Cs 3 Bi 2 Br 9 SC heterojunction detector achieves a high sensitivity of 1390 µC Gy air −1 cm −2 for 100 keV hard X-ray detection at room temperature, which is enhanced to 2075 µC Gy air −1 cm −2 at 75°C, demonstrating impressive high-temperature stability. Moreover, the detector achieves a detection limit of 37.48 nGy air s −1 and excellent stability for 90 days without any encapsulation. This work demonstrates the feasibility of using the epitaxial mechanism of perovskite formation on a high-surface-energy substrate for the controllable construction of a 3D/2D heterojunction that significantly enhances X-ray detection performance.
研究领域:
材料科学
·
物理学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Hanyu Guo,Wei-Wei Lu,Peng Xu,Jie Luo,Kaisheng Yao,Haoyan Cheng,Hao Hu,Kunpeng Sun
Metal e Metal halide perovskites (MHPs) have stand out as a photocatalyst because of their excellent optical property. However, the main drawbacks of MHPs are their instability resulted from their ionic nature, and the toxicity of Pb in popular lead halide perovskite. To solve these problems, in this work, we choose Cs3Bi2Br9 as a typical lead-free MHPs, and prepared Cs3Bi2Br9 using ionic liquids 1-decyl-3-methylimidazolium bromide ([Dmim]Br) as the surface ligands and bromine source through ligand-assisted reprecipitation method. The prepared Cs3Bi2Br9 NCs remained stable under light, heat and moisture, which is attributed to the anchoring of ionic liquid [Dmim]Br on the nanocrystalline surface to passivates the harmful defects. Then, we select oxidation of benzyl alcohol as a representative model reaction and investigated the photocatalytic performance of Cs3Bi2Br9 NCs. Under the illumination of visible light, benzyl alcohols can be transformed at the presence of Cs3Bi2Br9 NCs into corresponding aldehydes with near 100% selectivity and 99.64% conversion in 1 h. The radical scavenging experiments, spectroscopic analysis, and EPR measurements confirmed that the main active species responsible for highly selective oxidation were singlet oxygen 1O2, which were proved to be generated from the transformation of superoxide radicals •O2−. This work is expected to provide insights for extending the design and photocatalytic applications of lead-free MHPs NCs.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2022
·Vol. 37
·期 6
·065011
·
IF 2.048
Xiaoyu Wang,Nasir Ali,Gang Bi,Huizhen Wu
In this work, lead-free double perovskite Cs2BiAgBr6 film is fabricated and employed into resistive switching (RS) memory device with a metal/insulator/metal structure. The RS performances of the prepared device are examined both experimentally and theoretically. High-quality Cs2BiAgBr6 film is fabricated via a post-vacuum treatment and characterized systematically. In the prepared memory device, bipolar RS is observed with a high ON/OFF ratio, and the retention and endurance performances are measured. First-principles calculations based on the density functional theory reveal that the bromide vacancies (VBr) in Cs2BiAgBr6 render it metallic characteristics. Therefore, we propose that the migration of VBr under electrical fields formed and ruptured the conductive filament, leading to the RS behaviors of memory device.
研究领域:
材料科学
·
计算物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）