CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Bin Li,Chong Yang,Rongbo Ma,Bin Cao,Chaoyong Deng,Weichao Huang
Bi 3+ -doping luminescent materials have recently evoked considerable interest in versatile applications. In this work, we have developed a series of Bi 3+ -activated CaSrMSbO 6 (M = La, Gd, Y) phosphors with double perovskite structures, exhibiting blue emission from 350 nm to 500 nm. The emission spectral position and intensity of Bi 3+ ions can be tuned by changing excitation wavelength and doping concentrations. The relationship between the local crystal field environment and the luminescence properties is comprehensively analyzed. Importantly, optical temperature properties of CaSrLaSbO 6 : Bi 3+ were investigated and were found to reach a maximum relative sensitivity of 4.57 % K −1 at 298 K. Furthermore, the anti-counterfeiting ink was prepared using CaSrLaSbO 6 : Bi 3+ phosphors, and it showed tunable emission under different light stimulation. These results indicate that CaSrLaSbO 6 : Bi 3+ phosphors have application potential in optical temperature sensing and anti-counterfeiting.
研究领域:
材料科学
·
光学
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2012
·
IF 2.289
Lei Lei,Daqin Chen,Feng Huang,Yunlong Yu,Yuansheng Wang
Single phase cubic BaLnF 5 (Ln = La–Lu, Y) nanocrystals are successfully synthesized via a common facile solvothermal route using oleic acid as surfactant. It is found that the smaller the Ln 3+ radius, the easier to precipitate the undesired BaLn 2 F 8 phase in the reaction system along with the formation of BaLnF 5 . In this case, the appropriate reaction temperature is required to obtain single BaLnF 5 nanophase. Measurements on the up-conversion emission behaviors of the Yb 3+ /Er 3+ (Tm 3+ ): BaLaF 5 and Yb 3+ /Er 3+ (Tm 3+ ): BaLuF 5 nanocrystals demonstrate that BaLnF 5 are desirable up-conversion hosts. In addition, the Ce 3+ /Ln 3+ (Ln = Tb, Eu, Dy, Sm): BaGdF 5 nanocrystals are found exhibiting multicolor down-conversion emissions.
研究领域:
材料科学
·
光学
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DOI
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Energy Material Advances
·
2023
·
IF 12.9
Shuai Chen,Chuang Yu,Chaochao Wei,Ziling Jiang,Ziqi Zhang,Linfeng Peng,Shijie Cheng,Jia Xie
Lithium halide electrolytes show great potential in constructing high-energy-density solid-state batteries with high-voltage cathode materials due to their high electrochemical stability and wide voltage windows. However, the high cost and low conductivity of some compositions inhibit their applications. Moreover, the effect of electronic additives in the cathode mixture on the stability and capacity is unclear. Here, the Y 3+ doping strategy is applied to enhance the conductivity of low-cost Li 2 ZrCl 6 electrolytes. By tailoring the Y 3+ dopant in the structure, the optimal Li 2.5 Zr 0.5 Y 0.5 Cl 6 with high conductivity up to 1.19 × 10 −3 S cm −1 is obtained. Li 2.5 Zr 0.5 Y 0.5 Cl 6 @CNT/Li 2.5 Zr 0.5 Y 0.5 Cl 6 /Li 5.5 PS 4.5 Cl 1.5 /In-Li solid-state batteries with different carbon nanotube (CNT) contents in the cathode are fabricated. The stability and electrochemical performances of the cathode mixture as a function of CNT content are studied. The cathode mixture containing 2% (wt.) CNT exhibits the highest stability and almost no discharge capacity, while the cathode mixture consisting of Li 2.5 Zr 0.5 Y 0.5 Cl 6 and 10% (wt.) CNT delivers a high initial discharge capacity of 199.0 mAh g −1 and reversible capacities in the following 100 cycles. Multiple characterizations are combined to unravel the working mechanism and confirm that the electrochemical reaction involves the 2-step reaction of Y 3+ /Y 0 , Zr 4+ /Zr 0 , and Cl − /Cl x − in the Li 2.5 Zr 0.5 Y 0.5 Cl 6 electrolyte. This work provides insight into designing a lithium halide electrolyte-based cathode mixture with a high ionic/electronic conductive framework and good interfacial stability for solid-state batteries.
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SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Xiangyu Wan,Hongjie Song,Di Zhao,Lichun Zhang,Yi Lv
In the present work, Y-doped metal-organic framework-5 (MOF-5) was synthesized by a simple solvothermal method and characterized by X-ray diffraction, scanning electron microscope , energy dispersive X-ray spectroscopy and nitrogen adsorption–desorption measurements, and firstly used as gas sensor materials based on cataluminescence (CTL). When isobutanol passed through the surface of the material, CTL emission was observed. The luminescence characteristics and optimal parameters were investigated in detail. Under the optimized conditions, the present gas sensor exhibited a linear range of 6.4–80.1 mg L −1 toward isobutanol and with a limit of detection of 3.7 mg L −1 . The designed CTL sensor based on Y-doped MOF-5 shows no or weak sensing performance for foreign common volatile organic compounds. Moreover, compared with pure MOF-5, Y-doped MOF-5 exhibited a better CTL response to isobutanol under the same conditions. This work exploits a new application domain of metal-organic frameworks (MOFs).
研究领域:
材料科学
·
化学传感
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jing Wang,Fan Zhang,Yongsheng Liu,Jingxin Li,Ning Dong,Yejie Cao
Silicon carbide fibers-reinforced silicon carbide matrix (SiC f /SiC) composites, which are commonly used as thermal structural materials in different components, e.g., combustion chamber liners, are susceptible to water-oxygen corrosion, resulting in rapid performance degradation and structural collapse. To enhance their resistance to water-oxygen corrosion, the incorporation of rare-earth silicates (RE silicates) has been explored. In this study, novel Y/YbB 4 -modified SiC f /SiC composites, with superior resistance to water-oxygen corrosion, are fabricated using a combination of slurry infiltration (SI) and reactive melt infiltration (RMI) process. Results demonstrate that Y/YbB 4 -modified SiC f /SiC composites exhibit open porosity of 3.2 ± 0.4%, corresponding to remarkable reduction of 69.8% compared to CVI-SiC f /SiC composites. Furthermore, after being exposed to water-oxygen environment at 1200 °C for 100 h, the surface of Y/YbB 4 -modified SiC f /SiC composites displays various yttrium silicates and ytterbium silicates. The material exhibits strength retention of 76.84%, indicating a notable improvement of 15.71% over the CVI-SiC f /SiC composites.
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Biomaterials Science
·
2023
·Vol. 11
·期 14
·4930-4937
·
IF 6.6
Birong Fan,Wan Peng,Yu Zhang,Pingsheng Liu,Jian Shen
Photodynamic therapy (PDT) is becoming an efficient antibacterial strategy without drug-resistance. Here, we report a promising reactive oxygen species (ROS) conversion strategy to increase the antibacterial efficiency of an Eosin Y (EOS)-based PDT system. Based on visible-light illumination, EOS generates a high concentration of singlet oxygen (1O2) in the solution. With the introduction of HEPES in the EOS system, it can almost completely convert 1O2 to hydrogen peroxide (H2O2). The orders-of-magnitude increases in the half-lives of the ROS (H2O2vs.1O2) present in the solution can enable more persistent oxidation ability. Thus, it is able to increase the bactericidal efficiency (against S. aureus) from 37.9% to 99.9%, promote the inactivation efficiency of methicillin-resistant S. aureus (MRSA) from 26.9% to 99.4%, and enhance the eradication rate of MRSA biofilm from 69% to 90%. Further in vivo investigation showed that the increased oxidation ability of the EOS/HEPES PDT system can enable quicker healing and maturing (even better than that for vancomycin administration) of MRSA-infected skin wounds on rats. This strategy may find many creative applications for the efficient eradication of bacteria and other pathogenic microorganisms.
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PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 9
·1956-1963
·
IF 7.779
Mengen Gao,Qiang Bian,Hongping Wu,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu
Birefringent crystals, which can modulate the polarization of light, are particularly important in optical communication and the laser industry. Here we report the synthesis, structures, optical properties, and theoretical analyses of four rare-earth borates containing BO3 groups, i.e. LiRb2YB2O6, CaRbYB2O6, and Li2MY4B5O15 (M = Rb, Cs). Their structures are not all typical BO3 group distributions with large birefringence values, e.g., being parallel with each other's distribution or being a regular polygon distribution with a specific form that is parallel with an optical axis. However, their birefringence values exhibit an obvious increase from LiRb2YB2O6 (0.038@532 nm) to Li2MY4B5O15 (M = Rb, Cs) (0.103@532 nm). The origin of this birefringence increase was studied by structural analysis and theoretical calculation. First-principles calculations and structure comparisons indicate that the non-symmetry localization of electron density of the Y–O polyhedra has an important contribution to the large birefringence of Li2MY4B5O15 (M = Rb, Cs).
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JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2022
·
IF 0.243
Huang Yuhua,Liu Xiaogang,Shi Minxin,Qin Yuanyuan,Li Xiancai
The lanthanum ion imprinted polymer (La-IIP/SBA-15/Y) was successfully synthesized by the surface ion imprinting method. Using La-IIP/SBA-15/Y as the adsorbent to adsorb lanthanum ions, the overall empirical conditions were optimized, and the best exploratory conditions were finally found. The pH of the solution was 2; the adsorption equilibrium was reached in 60 min and the saturated adsorption capacity was 562.95 mg/g La-IIP/SBA-15/Y adsorbed gadolinium ions in the study of its adsorption process and found that it conforms to the Langmuir isotherm adsorption model, and the adsorption reaction is a spontaneous reaction, and it also conforms to the quasi-second-order kinetic model. The selectivity of the adsorbent was explored experimentally, and the results showed that La-IIP/SBA-15/Y has good selectivity, and experimental elution and regeneration performance. The best elution effect is 2 mol/L hydrochloric acid. La-IIP/SBA-15/Y has good stability and can be reused.
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CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Wenhao Cui,Dali Zhu,Juan Tan,Nan Chen,Dong Fan,Juan Wang,Jingfeng Han,Linying Wang,Peng Tian,Zhongmin Liu
ABSTRACT Mesoporous high-silica zeolite Y with advantages of improved accessibility of acid sites and mass transport properties is highly desired catalytic materials for oil refinery, fine chemistry and emerging biorefinery. Here, we report the direct synthesis of mesoporous high-silica zeolite Y (named MSY, SiO 2 /Al 2 O 3 ≥ 9.8) and their excellent catalytic cracking performance. The obtained MSY materials are mesoporous single crystals with octahedral morphology, abundant mesoporosity and excellent (hydro)thermal stability. Both the acid concentration and acid strength of H-form MSY are obviously higher than those of commercial ultra-stable Y (USY), which should be attributed to the uniform Al distribution of MSY zeolite. The H-MSY displays an obviously reduced deactivation rate and improved catalytic activity in the cracking reaction of bulky 1,3,5-triisopropylbenzene (TIPB), as compared with its mesoporogen-free counterpart and USY. In addition, H-MSY was investigated as catalyst for the cracking of industrial heavy oil. The MSY-based catalyst (after aging at 800 o C in 100% steam for 17 h) exhibits superior conversion (7.64% increase) and gasoline yield (16.37% increase) than industrial fluid catalytic cracking (FCC) catalyst under the investigated conditions.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Juan Yi,Yiheng Song,Zhilong Cao,Chenjian Li,Chuanxi Xiong
With the demand of green energy upsurging, piezoelectric nanogenerators (PENGs) are booming for next generation of wearable energy supply. In this work, Y-doped ZnO was manufactured with yield of ~3.2 g (~74%) in one pot, and PVDF/Y-doped ZnO electrospun films was fabricated with flexibility of PVDF and high piezoelectricity of Y-doped ZnO (Y–ZnO). Among all electrospun films, the degree of dipole orientation of PVDF and the contents of Y-doped ZnO in 15 Y-Z films is uppermost except for agglomerated 20 Y-Z electrospun film. Increasing amounts of Y–ZnO and enhanced alignment degree of PVDF cause increased piezoelectric output. When walking or running on 15 Y-Z PENG, output voltage raised to ~20 V and ~35 V, and capacitor of 5 μF was charged to ~2.8 V and ~3.7 V in 50 s. For 15 Y-Z PENG with high F(β) of 98%, its output voltage and current increased to ~13 V and ~1.6 μA, and its maximum instantaneous power density (~2 μW/cm 2 ) was obtained with load of 10 MΩ at 40 N and 0.8 Hz. In addition, 15 Y-Z PENG can withstand compressing and releasing for 1100 s at 0.8 Hz. Such brilliant performance earns gigantic prospect of application on collecting teeny-weeny energy.
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Materials Express
·
2020
·Vol. 10
·期 10
·1725-1731
·
IF 1.65
Duan Xiaobo,Ding Yanhong,Yu Meng
Multilayer graphene was prepared in this study by microwave burst method. Cu9S5/CoS/graphene and CuS/CoS2/graphene composites were obtained by hydrothermal method to regulate the molecular structure and combination of Cu and Co metal sulfides on graphene
substrate. Graphite oxide was doped by hydrothermal method, and then Cu9S5/CoS/graphene composite was prepared by microwave explosion method. Raman, SEM and TEM were used to characterize the self-made graphene. Results showed that the multilayer graphene had a bag-like
structure which was beneficial to anchor sulfide. Three graphene-based composites were characterized by scanning electron microscopy, X-ray diffraction, energy spectrum analysis and electrochemical properties. Moreover, results showed that CuS/CoS2/graphene had the best electrochemical
performance, and its specific capacity reached 324 F/g when the current density was 1 A · g–1, which was much higher than that of the other two samples. Capacity retention rate, interfacial charge transfer resistance and electrolyte diffusion resistance also have advantages.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Aihu Feng,Yang Yu,Le Mi,Yunzhen Cao,Yun Yu,Lixin Song
In this work, the hierarchical Y zeolites are firstly obtained by etching NaY zeolites with different NH 4 HF 2 solutions. The morphology and microstructure, toluene adsorption property of as-prepared hierarchical Y zeolites are characterized. The results demonstrate that the mesoporous number and size, the n(SiO 2 )/n(Al 2 O 3 ) value of hierarchical Y are increased with NH 4 HF 2 concentration. The 0.3M NH 4 HF 2 -etched NaY exhibits satisfactory crystallinity, suitable mesoporous content and better toluene adsorption performance. The NH 4 HF 2 -etched NaY is an excellent material for pressure swing adsorption. Furthermore, the synthesis mechanism of hierarchical Y has been elaborately demonstrated. The synergistic effect of H + and F − is beneficial to dealumination as well as the introduction of mesoporous. The NH 4 HF 2 ionizes into positive H + and negative F − at a very slow rate, which avoids the concentration of H + and F − going up suddenly. Under the circumstances, the dealumination reaction between NH 4 HF 2 and NaY zeolites is more sustained and mild, and the crystallinity of hierarchical Y zeolites is higher than that of the HCl/NH 4 F-etched or HF/NH 4 F-etched NaY. This work presents an effective method to synthesize the hierarchical Y zeolites.
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