JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 10
·10336-10341
·
IF 1.798
Wu Shuang,Liu Pei,Lai Yuanming,Guan Weiming,Huang Zihan,Han Jiao,Xiang Yao,Yi Wei,Zeng Yiming
The Ba 2+ doped ceramics of Ca 1−x Ba x Cu 3 Ti 4 O 12 (x = 0.005, 0.01, 0.03, 0.05 and 0.1) were sintered via conventional solid-state reaction at 1050 °C for 8 h in air. The microstructure and electric properties of Ba 2+ doping ceramics were investigated. The lattice parameters of Ca 1−x Ba x Cu 3 Ti 4 O 12 (CBCTO) ceramics decreased with the Ba 2+ doping, and Ba 1.31 Ti 8 O 16 as secondary phase was confirmed at x = 0.1. The doping of Ba 2+ resulted in uniformly distribution of small size grain (~4 μm). All the doped samples showed lower value of dielectric constant than CaCu 3 Ti 4 O 12 (CCTO), due to low resistivity of the grain boundary with the Ba 2+ doped samples. The nonlinear coefficient and breakdown field were significantly enhanced by Ba 2+ doping.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Yanlin Wang,Xi Wang,Jingjing Mu,Hairong Yu,Xingbin Lv,Ting Liang,Changjing Cheng
Barium ions (Ba 2+ ) contamination is a serious environmental problem worldwide. The currently existing Ba 2+ -detection techniques are generally expensive, time-consuming, and complicated. Therefore, the development of a simple, inexpensive, rapid, and effective strategy to detect Ba 2+ in water is of great importance. Herein, we first report a smart photonic crystal hydrogel (PCH) sensor for simple, highly selective, and naked-eye detection of Ba 2+ in water based on 18-crown-6/Ba 2+ host–guest interactions. This sensor was composed of a poly(benzo-18-crown-6-acrylamide- co - N -isopropylacrylamide- co -acrylamide) (PBCNA) intelligent hydrogel with embedding Fe 3 O 4 @SiO 2 colloidal photonic crystals (CPCs). The prepared PBCNA PCH sensor demonstrated pH and temperature-dependent Ba 2+ -detection performances. Besides, the Ba 2+ -responded PCH sensor could be easily regenerated via simple washing using hot/cold water at least 20 times without compromising its detection performance. Such a PCH sensor with obvious advantages of portability, ease of operation, cost-effectiveness, high selectivity and excellent regenerability, provides a simple and effective strategy to monitor Ba 2+ in contaminated water.
研究领域:
环境科学
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材料科学
·
化学传感器
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产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 2
·251-255
·
IF 1.071
He Qian,Zhang Ying,Xiao Huajian,He Xiaohui,Zhou Xiantai,Ji Hongbing
A facile co-precipitation method was developed to prepare the novel metalloporphyrins-Ba 2+ composites with ca. 3 μm diameter and olive-like morphology. Olefins epoxidation reactions were employed to investigate their catalytic performance. Compared with the free metalloporphyrins, the composites exhibited not only the improved stability and recyclability, but also the enhanced catalytic activity. Such catalytic behaviors could be related to the unique structure of the composites, e.g., the strong interaction between R-SO 3 - and Ba 2+ ions and the uniform distribution of metalloporphyrins on the catalyst surface, respectively. Furthermore, the composites showed good compatibility with a wide range of substrates. The well-designed composites are expected to be efficient catalysts, alternative to many sophisticated-synthesized metalloporphrins-based materials, in the industrially important reactions.
研究领域:
化学
·
催化材料科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Fan Lin,Yuehua Hu,Tao Wu,Xiaoshun Zhou,Yong Shao
The aggregation-based fluorescent probes have received much attention due to their increased fluorescence contrast and improved selectivity upon target binding. Although the probes bearing aggregation-induced emission (AIE) and aggregation-caused quenching (ACQ) properties have been developed, low-concentration-capable aggregation probes that have a nonfluorophore-to-fluorophore conversion upon DNA binding are still in great demand. Herein, we found that hypericin (Hyp) can reach this performance upon selectively interacting with noncanonically structured DNAs. The rightly folded G-quadruplexes (G4) with the appropriate sequences can disperse the nonfluorophore Hyp aggregate into a red emitter, while the randomly coiled ss-DNA and canonical ds-DNA duplex are completely inefficient to get this dispersion. As a dispersion-induced fluorophore (DIF), Hyp stacks with the structured bases other than the tetrad guanines in G4 to give a red monomeric emission. However, the stacking interaction with the guanine base compromises the Hyp fluorescence by excited-state electron transfer, as revealed using another noncanonical abasic site-containing DNAs. The DIF behavior can be operated at very low Hyp concentration and a highly selective G4-based fluorescent Ba 2+ sensor has been developed.
研究领域:
化学
·
分子生物学
·
分析化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yuanyuan Fan,Shun Li,Daobin Zhu,Keyu Guo,Rangrang Fan,Chunfeng Dong,Yongtao Liu,Yong Li,Junshan Hu
The thermal quenching effect of photoluminescent materials greatly limits their practical applications in bioimaging, sensing, radiation detection, and photovoltaic devices. In this paper, the upconversion luminescence (UCL) of Sc 2 W 3 O 12 :Er 3+ /Yb 3+ was significantly improved by doping Ba 2+ ions. The study identifies that the optimal doping concentration of Ba 2+ ions within the negative thermal expansion (NTE) phosphors Sc 2 W 3 O 12 : Er 3+ /Yb 3+ is 0.03 mol, the green and red light intensities of Sc 2 W 3 O 12 : Er 3+ /Yb 3+ /Ba 2+ phosphor were increased by 32.76 times and 23.06 times. When the temperature rises from 298 K to 523 K, the NTE effect causes an abnormally increased luminous intensity. Utilizing fluorescence intensity ratio (FIR) technology, the temperature sensing characteristics of the Sc 2 W 3 O 12 : 0.30 Yb 3+ , 0.02 Er 3+ , 0.03 Ba 2+ phosphor were further examined, achieving maximum relative and absolute sensitivities of 1.24 % K −1 and 1.97 % K −1 , respectively.
研究领域:
材料科学
·
无机化学
·
光子学
·
温度传感
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功能材料
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Mude Zhu,Yi Tang,Xueqin Chen,Biru Liao,Yang Yu,Sen Hou,Xiaoyun Fan
A built-in electric field of the ferroelectric contributes to improving the photoinduced charges separation in the photocatalysis, attracting great attention for the elimination of contaminants from water sources. Herein, a series of Ba 2+ doped Sr 1-x Ba x Bi 2 B 2 O 7 (0 ≤ x ≤ 0.6) were synthesized successfully. Among all samples, Sr 0.5 Ba 0.5 Bi 2 B 2 O 7 showing the most splendid photocatalytic degradation activity, could degrade 94.06% of TC in 30 min, which was about 6.75 and 2.56 times higher than that of the undoped one and BaTiO 3 , respectively. The synergistic effect of a strong built-in electric field and an appropriate oxygen vacancy was responsible for its high efficiency. The sample remained the superior photocatalytic activity under different reaction parameters including temperature, catalyst dosage, pH, initial ions species, and in the presence of humic acid and different types of water bodies. The different quenching and the controlled atmosphere experiments confirmed that e − and h + played an essential role in attacking TC molecular. LC-MS revealed its three degradation pathways including the process of demethylation, hydroxylation, and dehydroxylation. The toxicity of formed degradation products reduced significantly. The work is of great significance to construct more ferroelectric photocatalysts and highlights the potential of ferroelectric catalysts for purifying wastewater.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Jinglin Shen,Yue Bi,Hao Zhang,Liandi Xu,Jin Feng,Wei Qi
Gold nanoclusters (AuNCs) are a class of promising inorganic-organic hybrid nanomaterials with exceptional photoluminescent properties. The understanding of their photoluminescent mechanism is important for developing functional AuNCs-based materials. In this work, thiobarbituric acid-modified AuNCs (TBA-AuNCs) was prepared and its photoluminescent property was modulated through co-assembly with Ba 2+ . The emission intensity was sharply enhanced with the formation of TBA-AuNCs/Ba 2+ complex. Structural characterization including transmission electron microscopy , scanning electron microscopy and X-ray photoelectron spectroscopy confirmed the hybridization of TBA-AuNCs with Ba 2+ . The pH-dependent photoluminescence as well as zeta potential measurements demonstrated that the ligand to metal charge transfer (LMCT) is crucial for the regulation of emission property of the TBA-AuNCs/Ba 2+ . Based on this special photoluminescent mechanism, the TBA-AuNCs/Ba 2+ complex was employed as a chemical sensor for nitro-substituted aromatic compounds . The emission intensity of TBA-AuNCs/Ba 2+ selectively displayed sharp quenching in response to 2-methyl-4-nitroimidazole among various imidazole derivatives. Simultaneously, the complex also showed high sensitivity toward p -nitroaniline and 2-nitrophenol. Therefore, the developed TBA-AuNCs/Ba 2+ assemblies are potential in detecting the nitro-containing compounds, which will find applications in pharmaceutical analysis, environmental protection and other related fields.
研究领域:
材料科学
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分析化学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Wenbo Ji,Fengmei Zhu,Yuan Gao,Jianbei Qiu
Near-infrared (NIR) light sources play a significant role in detection and therapies in healthcare, agriculture, and other fields for their outstanding ability of tissue penetration, excellent safety features, and useful bandwidth that match well with the vibration of chemical bonds. NIR phosphor-converted light-emitting diode (NIR pc-LED) devices are considered to be one of the most promising NIR light sources due to their unique advantages, including tunable wavelength, high efficiency, long life, low cost, and compact size. Compared to traditional resin-based casting technology, which has shortcomings such as complicated packaging process, poor thermal conductivity, and aging of plastic materials, transparent oxide glass-ceramics (GCs) have excellent optoelectronic properties, high physical and chemical stability, simple manufacturing processes, etc. Here, we report the synthesis of a series of Cr3+-doped Ba2–xSrxNaNb5O15 nanocrystals embedded within GCs, which exhibit an ultrabroadband NIR emission covering 600 ∼ 1500 nm under 460 nm blue light excitation, by a two-stage heating-quenching and recrystallization method. It was noticed that as Ba2+ ions in the matrix were increasingly replaced by Sr2+ ions, the peak of the corresponding NIR emission of the GCs continuously shifted from ∼823 to 855 nm, and a photoluminescence quantum yield of ∼39.13% was achieved with the GCs NIR phosphor with an optimal composition. Mechanistic studies showed that the emission originates from the 4T2 → 4A2 spin-allowed transition of Cr3+ ions. NIR pc-LED light source devices were prepared from the optimized GCs and blue light LED chips, and their potential applications in night-vision imaging and nondestructive testing were demonstrated. Our study provides an innovative approach for the design of materials of continuous solid solution transparent oxide GCs with tunable wavelengths and their applications.
研究领域:
材料科学
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光学工程
·
生物医学工程
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光电子学
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无机非金属材料
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生物光子学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Yuebin Xu,Aierpati Taximaimaiti,Ru Xie,Hairegu Tuxun,Min Yin,Aierken Sidike
Upconversion luminescent (UCL) materials have broad application prospects in the field of temperature sensing; thus, improving the luminescence performance and temperature measurement sensitivity of upconversion phosphors is highly important. In this study, SrAl 2 Si 2 O 8 with good thermal stability was doped with Ho 3+ and Yb 3+ , and the optimal concentration was determined to be SrAl 2 Si 2 O 8 :1%Ho 3+ , 12%Yb 3+ (in mole fraction). A series of (Sr 0.87‒ x Ba x )Al 2 Si 2 O 8 :1%Ho 3+ , 12%Yb 3+ phosphor samples was prepared by using a cationic substitution strategy and further doping Ba 2+ to replace the Sr 2+ lattice in the matrix. The results show that the introduction of Ba 2+ effectively replaces Sr 2+ and significantly increases the upconversion fluorescence emission intensity of SrAl 2 Si 2 O 8 :1%Ho 3+ , 12%Yb 3+ by approximately 2.9 times. The temperature sensing properties of SrAl 2 Si 2 O 8 :1%Ho 3+ , 12%Yb 3+ and Sr 0.37 Ba 0.50 Al 2 Si 2 O 8 :1%Ho 3+ , 12%Yb 3+ were investigated. The Ho 3+ -based 5 F 5 and 5 S 2 / 5 F 4 nonthermal coupled energy level fluorescence intensity ratio (FIR) techniques in the Ba 0.37 Sr 0.50 Al 2 Si 2 O 8 :1%Ho 3+ , 12%Yb 3+ phosphors show a maximum temperature measurement absolute sensitivity of 4.32%/K at 573 K and a maximum relative sensitivity of 1.08%/K at 373 K; these values are 5.8 and 3.2 times greater, respectively, than that of the non-Ba 2+ -doped SrAl 2 Si 2 O 8 :1%Ho 3+ , 12%Yb 3+ phosphor. These results not only confirm the effectiveness of the cation substitution strategy in enhancing the upconversion luminescence performance and temperature sensing characteristics but also provide a scientific basis for the design of high-performance optical temperature sensors.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhao Wang,Wenyue Zhao,Ze Li,Yazhou Peng,Chang Gao,Lei Shi,Wenjing Hua,Weidong Fei,Yu Zhao
The search for multiferroic materials with ferroelectric and ferromagnetic properties at room temperature continues to be driven by the prospect of new devices. In this paper, Ba 2+ -Ti 4+ co-doped Y 1- x (Ba 0.5 Ti 0.5 ) x FeO 3 were prepared by a traditional solid-state reaction method. The ferroelectricity and ferromagnetism of the co-doped ceramics have been enhanced simultaneously with the maximum polarization of 0.48 μC/cm 2 and the maximum magnetization of 3.25 emu/g, the switched charge density (0.26 μC/cm 2 ) measured by PUND tests indicating the intrinsic and switchable remanent polarization. The increase of Fe 2+ content (increased to 28 % with the increase of doping content) caused by Ba 2+ -Ti 4+ co-doping destroys the antiferromagnetic ground state, and the doping strategy enlarges the tilt angle of oxygen octahedron from 144.93° to 148.63°. The magnetic domain switches caused by the external electric field were directly observed by magnetic force microscopy, indicating the modulation of magnetic domain by polarization at room temperature. This work may provide useful information for the structural design and performance improvement of multiferroic materials.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2015
·Vol. 98
·期 10
·3285-3290
·
IF 2.61
Linjie Gao,Shengjun Zhai,Ran Liu,Nian Fu,Jianglong Wang,Guangsheng Fu,Shufang Wang
Polycrystalline Cd 1− x Ba x O (0 ≤ x ≤ 0.08) ceramics were synthesized via conventional solid-state reaction method, and the effect of Ba 2+ doping on the microstructure as well as the thermoelectric transport properties of the samples were investigated. It was found that doping of Ba 2+ can inhibit the grain growth of CdO, resulting in a considerable reduction in grain size. Moreover, with the increase in Ba 2+ doping content, both the electrical conductivity and the thermal conductivity of Cd 1− x Ba x O decreased, whereas the Seebeck coefficient increased. A high ZT value of 0.47 was achieved for Cd 0.99 Ba 0.01 O at 1000 K, 38% higher than the undoped CdO, mostly due to reduction of the thermal conductivity.
研究领域:
材料科学
·
热电学
·
陶瓷
·
固态化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 24
·5903
·
IF 4.2
Yang Zhang,Hua Tan,Jiaping Zhu,Linhai Duan,Yuchi Ding,Fenglan Liang,Yongshi Li,Xinteng Peng,Ruomei Jiang,Jiaxin Yu,Jianjiong Fan,Yuhang Chen,Rimeng Chen,Deyun Ma
The development of lanthanide–organic frameworks (Ln-MOFs) using for luminescence sensing and selective gas adsorption applications is of great significance from an energy and environmental perspective. This study reports the solvothermal synthesis of a fluorine-functionalized 3D microporous Tb-MOF with a face-centered cubic (fcu) topology constructed from hexanuclear clusters (Tb6O30) bridged by fdpdc ligands, formulated as {[Tb6(fdpdc)6(μ3-OH)8(H2O)6]·4DMF}n(1), (fdpdc = 3-fluorobiphenyl-4,4′-dicarboxylate). Complex1displays a 3D framework with the channel of 7.2 × 7.2 Å2(measured between opposite atoms) perpendicular to thea-axis. With respect to Ba2+cation, the framework of activated1(1a) exhibits high selectivity and reversibility in luminescence sensing function, with an LOD of 4.34665 mM. According to the results of simulations, compared to other small gas molecules (CO2, N2, H2, CO, and CH4), activated1(1a) shows a high adsorption selectivity for C2H2at 298 K.
研究领域:
材料科学
·
环境科学
·
化学
✓ 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）