SENSORS
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2024
·Vol. 24
·期 13
·4142
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IF 3.4
Ling Zhang,Chu Chen,Hongyan Zhang
TiO2is a typical semiconductor material, and it has attracted much attention in the field of humidity sensors. Doping is an efficient way to enhance the humidity response of TiO2. Eu-doped TiO2material was investigated in both theoretical simulations and experiments. In a simulation based on density functional theory, a doped Eu atom can increase the performance of humidity sensors by producing more oxygen vacancies than undoped TiO2. In these experiments, Eu-doped TiO2nanorods were prepared by hydrothermal synthesis, and the results also confirm the theoretical prediction. When the doping mole ratio is 5 mol%, the response of the humidity sensor reaches 23,997.0, the wet hysteresis is 2.3% and the response/recovery time is 3/13.1 s. This study not only improves the basis for preparation of high-performance TiO2humidity sensors, but also fills the research gap on rare earth Eu-doped TiO2as a humidity-sensitive material.
研究领域:
材料科学
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半导体技术
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DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2025
·
IF 3
Guo Wenhang,Zeng Liang,Zhang Xinyuan,Cai Xiaoyu,Su Tan,Su Zhongmin
A silicate inorganic phosphor matrix, CJU-1-Eu (K 3 EuSi 6 O 15 ), based on rice husk-derived biomass silicon, was synthesized via a hydrothermal method. The material was doped with Tb 3+ ions, and the effect of Tb 3+ concentration was investigated, resulting in a series of tunable white-light inorganic phosphors (CJU-1-Eu: x Tb 3+ ) ranging from warm white to cool white. The CJU-1-Eu:0.04Tb 3+ inorganic white-light phosphor was combined with a UV chip to produce the white-light-emitting diode (WLED) device. The device exhibited CIE coordinates of (0.332, 0.327) and the color rendering index (CRI) of 86.5 at 100 mA current. This white-light phosphor achieves both the recycling and high-value utilization of rice husk ash.
研究领域:
材料科学
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环境科学
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光学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hang Liu,Junlong Liu,Yanchang Liu,Zhihao Qu,Siye Tian,Yuhong Zhang
In this work, the ZnO microsphere is prepared by hydrothermal method and modified with different concentrations of Eu. The morphology of ZnO:Eu sample shows flower-like microspheres with many nanosheets. The gas performance of ZnO:Eu microsphere is investigated for detecting NO 2 . Compared with pure ZnO, the response of ZnO:2 % Eu sensor is increased by 8 times, and the optimal operating temperature of that is decreased to 130 °C. Especially, the gas sensing properties of ZnO:2 % Eu sensor is enhanced under UV excitation. The recovery time of ZnO:Eu sensor is reduced by 1200 s, and the response is increased by 3.6 times under UV excitation. The above results show an increase in sensor response due to doping Eu and UV excitation. At last, the possible gas mechanism of ZnO:Eu is discussed with and without UV excitation. This finding provides important guidance for UV-assisted sensors to enhance NO 2 response.
研究领域:
材料科学
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环境监测
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DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Rong Han,Yusong Pan,Chao Du,Yanlei Xiang,Yuanqing Wang,Hongwu Zhu,Chengjie Yin
Aqueous zinc ion batteries (AZIB) have become a research hotspot for energy storage systems (ESS) in recent years due to some advantages such as their low risk and low cost. However, the structural collapse during charging and discharging affects the reversibility of the battery , which is a very serious blow to manganese-based materials and will affect their subsequent development in batteries. Therefore, β-MnO 2 cathode materials doped by the rare earth element europium (Eu) were prepared by a simple hydrothermal method . Compared with β-MnO 2 , Eu-doped MnO 2 possessed a high specific capacity of 409 mA h g −1 at 0.2 A g −1 . The initial specific capacity of Eu-doped MnO 2 at 1 A g −1 was 200.23 mA h g −1 and the maximum discharge specific capacity of 254 mA h g −1 was reached at 128 cycles. The energy storage mechanism of the electrodes was investigated by ex-situ XRD and ex-situ XPS tests. It was found that Eu element doping to β-MnO 2 not only maintains the stability of the crystal structure during redox reaction, but also promotes the embedding reaction of H + /Zn 2+ . The combination of rare earth elements Eu and MnO 2 is a new direction in the development path of aqueous zinc ion batteries.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 21
·1721
·
IF 4.4
Qi You,Xuan Zhou,Chengxiang Yang,Mu Liu,Wei Liu,Jinkai Li,Xuchuan Jiang
A series of red-emitting phosphors, Na3.6Y1.8−x(PO4)3:xEu3+, have been synthesized by a high-temperature solid-phase method. The impact of the partial Li+/K+ion substitution on the crystal structure and photoluminescence (PL) performance of Na3.6Y1.05(PO4)3:0.75Eu3+phosphor have been investigated. Various techniques have been used for characterization of the as-obtained materials. X-ray diffraction (XRD) analysis was utilized to confirm the composites of these samples, and the morphology and element distribution were examined by scanning electron microscope (SEM) and transmission electron microscope (TEM). This study found that the developed Na3.6Y1.8−x(PO4)3:xEu3+phosphors exhibited a prominent emission peak at ~620 nm when excited at 393 nm, which corresponded to5D0→7F2transitions of Eu3+ions. Furthermore, the robust emission peak at ~705 nm (5D0→7F4) of these phosphors enables a better match with plant pigment absorption. Beyond that, the partial substitution of Li+/K+ions probably changed the crystal structure, and reduces the symmetry around Eu3+, leading to significantly enhanced luminous intensities by 23.24% and 18.29%, with the highest quantum yields (QYs) reaching 99.85% and 96.29%, respectively. Additionally, the prepared phosphors show non-thermal quenching and superior thermal stability at elevated temperatures from 298 to 473 K. These findings and results suggest that Li⁺/K⁺-substituted Na3.6Y1.05(PO₄)₃:0.75Eu3⁺ phosphors can serve as promising red-emitting phosphors for plant lighting applications.
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
International Journal of Applied Ceramic Technology
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2022
·Vol. 20
·期 3
·1953-1962
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IF 2.328
Quansheng Wu,Shanshan Ye,Xufeng Zhou,Jianyan Ding
Developing narrowband red phosphors has always been a frontier topic in the phosphor community. In this study, a novel hafnium germanate red phosphor, BaHfGe 3 O 9 :Eu 3+ , was successfully synthesized by solid-state reaction method. The phase and crystal structure of BaHfGe 3 O 9 were investigated by the Rietveld refinement of powder X-ray powder diffraction. The band structure was analyzed by density functional theory calculations. Most importantly, the luminescence behavior of phosphors under near-ultraviolet (n-UV) light and cathode rays sources was studied in detail to explore the possibility of their applications in white light-emitting diodes and field emission display. The BaHfGe 3 O 9 :Eu 3+ phosphor exhibits strong f–f excitation and excellent thermal robustness due to Eu 3+ localization in the rigid lattice and asymmetric Ba 2+ sites. Under cathode rays and n-UV light excitation, BaHfGe 3 O 9 :Eu 3+ exhibits narrowband red light emission peaked at 610 nm. Moreover, BaHfGe 3 O 9 :Eu 3+ shows excellent saturation resistance and aging resistance. The performance of the LED lamp encapsulated by the BaHfGe 3 O 9 :Eu 3+ phosphor was studied. The results show that BaHfGe 3 O 9 :Eu 3+ is a potential red phosphor for multifunctional applications.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
SURFACE ENGINEERING
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2022
·
IF 2.451
Sang Xiong,Ruo-tian Wang
Europium nitrate, ammonium tungstate and hexadecyl trimethyl ammonium bromide were used, and Eu-doped WO3 (WO3:Eu3+) nanopowder was synthesized by the micro-emulsion method. Tetraethyl silicate was hydrolysed into SiO2 and WO3:Eu3+ nanopowder coated with SiO2 (SiO2/WO3:Eu3+) was obtained. The microstructure and morphology of the prepared nano-SiO2/WO3:Eu3+ powders were characterized by XRD, SEM, TEM and HRTEM. Results showed that the prepared nano-SiO2/WO3:Eu3+ powders composed of WO3 of monoclinic and SiO2 of amorphous, which was spherical and granular, and the grain size reaches 50 nm. The tribological behaviour of nano-SiO2/WO3:Eu3+ as extreme pressure and anti-wear additive in the water-based fluid was studied by a four-ball machine. The results demonstrate that nano-SiO2/WO3:Eu3+ exhibits superior load-bearing capacity, anti-wear and anti-friction performance in water-based fluid, especially when the optimal concentration of nano-SiO2/WO3:Eu3+ is 0.4 wt-%. WSD, COF and wear volume of the nano-SiO2/WO3:Eu3+ decreased by 62.43%, 30.20% and 67.34%, respectively, compared with that of the water-based fluid.
研究领域:
材料科学
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摩擦学
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纳米技术
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DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2024
·
IF 3.9
Lihan Deng,Jin Li,Jiachen Chen,Jin He
Nanoporous Al 2 O 3 -SiO 2 glasses were prepared using a sol–gel method. These sintered nanoporous Al 2 O 3 -SiO 2 glasses have a transmittance greater than 85 % and possess high mechanical strength, enabling them to contain and protect RE ions. Owing to the presence of nanopores in nanoporous Al 2 O 3 -SiO 2 glasses, Eu ions can easily enter the nanoporous Al 2 O 3 -SiO 2 glasses via an ex-situ dipping method. After drying at room temperature (RT) and then heating at 400 °C, 600 °C, 800 °C, and 1200 °C, we obtained a series of Eu doped nanoporous Al 2 O 3 -SiO 2 glasses. The thermal reduction process from Eu 3+ ions to Eu 2+ ions can occur at a lower sintering temperature (400 °C), enabling a detailed analysis of the thermal reduction mechanism at both low and high temperatures in detail. Under the conditions where Al 3+ ions are present in the samples that are under calcination, Eu 2+ -doped nanoporous Al 2 O 3 -SiO 2 glasses are more easily obtained at relatively low temperatures. Owing to the adjustable composition of Eu 3+ /Eu 2+ in the nanoporous Al 2 O 3 -SiO 2 glasses, tunable emission from red-orange light to blue-violet light can be achieved in the samples. This new type of transparent Eu-doped NPGs has the advantages of high mechanical strength and good processability and is non-toxic and harmless, thereby showing great potential for use in tunable light sources and LED devices.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 16
·7863-7876
·
IF 4.682
Liu Shixin,Du Mingrun,Ge Yanfeng,Li Zepeng,Srivastava Gyaneshwar P.,Wang Jinhua,Wei Tong,Zou Yunling,Li Xiaodong,Li Yanchun,Wang Mingchao
High entropy oxides are novel materials with diverse compositions that have received significant interest for their mechanical and photocatalytic properties. In this study, we enhanced the mechanical and photocatalytic performance of solid state fabricated high entropy oxide (La 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Y 0.2 ) 2 Zr 2 O 7 through Eu doping. Samples doped with different Eu ion concentrations demonstrated good thermal stability under high temperature without phase transformation after sintering at 1500 °C. We performed high pressure X -ray diffraction measurements and found that bulk modulus and critical pressure were improved by approximately 30 GPa and 5 GPa, respectively. This significant compression difference confirmed that Eu doping enhanced structural stability under high pressure. (La 0.2 Nd 0.2 Sm 0.2 Gd 0.2 Y 0.2 ) 1.98 Eu 0.02 Zr 2 O 7 demonstrated the best photocatalytic performance, with a kinetic constant about 1.5 times that of undoped samples. The appropriate doping concentration, smaller grain size and wider light absorption range contribute to the better photocatalytic performance irradiated under UV light. This work provides valuable insights for the design and improvement of high entropy oxide mechanical and photocatalytic performance. Graphical abstract
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Long Chen,Sijie Su,Peijing Tian,Jian Yuan,Weihong Zheng
Rare earth elements have attracted significant attention due to their unique electronic structure. By doping rare earth ions into oxides, they can be used as spectral conversion materials in fields such as photovoltaic power generation and biological probes. In this paper, the performance of Eu 3+ doped Al 2 O 3 hollow microspheres by sol-gel method was analyzed by SEM, XRD, IR, TG-DSC, and fluorescence spectrometer. Using aluminum isopropoxide (Al(OC 3 H 7 ) 3 ) as raw material, PMMA with a particle size of 150 nm as the template, PMMA/boehmite particles with core-shell structure can be prepared by sol gel method and template method. After adding Eu 3+ and heat treatment, a transition occurred from γ-AlOOH(85 °C)→γ-Al 2 O 3 (600 °C)→θ-Al 2 O 3 (1000 °C)→α-Al 2 O 3 (1200 °C) as the temperature increased, and EuAlO 3 was generated at 1200 °C. Eu 3+ occupied the sites without inversion centers inside the host lattice, and the alumina was an effective matrix for the fluorescent properties of Eu 3+ . Its excitation was caused by the 7 F 0 → 5 L 6 transition, and its luminescence was controlled by the 5 D 0 → 7 F 2 transition, which can convert ultraviolet light into red and orange light. The fluorescence intensity increases with the increase of Eu 3+ content, and no quenching was observed at a doping concentration of 10mol% Eu 3+ .
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Ruiyu Fu,Jiawei Liu,Yongpeng Ma,Hongbo Li,Xiaoqin Hai,Jiaxiao Niu,Xiaoli Guo,Xin Di
Tetracyclines (TCs) residues pose a significant threat to the aquatic environment and human health, therefore this study aims to develop a simple, rapid, and sensitive TCs detection method. Herein, a dual-responsive gel probe (LDH-CES@N) was designed, consisting of the intercalation of graphene quantum dots into europium-doped layered double hydroxide (LDH). In the presence of TCs, the as-prepared probe exhibited dual emission fluorescence at 504 nm and 616 nm due to the synergistic effect of aggregation-induced emission and antenna effect. Meanwhile, the density functional theory was employed to validate the mechanism underlying TC-induced electron transfer from graphene quantum dots. The dual-signal response fluorescence probe has excellent detection ability of oxytetracycline, including a wide detection range (0–60 μM), low detection limit (0.145 μM), and rapid response time (120 s). Furthermore, combined with the smartphone, a portable and real-time detection platform was established for the visual detection of oxytetracycline in tap water and honey samples with desirable recovery rates (97.8 %-105.4 %). Therefore, this work provides a new strategy for fluorescence detection of trace pollutants, demonstrating considerable practical application potential.
研究领域:
环境科学
·
分析化学
·
生物医学工程
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yu Bing,Zhao Song,Hongtao Jiang,Xiaoyi Xu,Zhongzheng Yu,Tingting Zhou,Tong Zhang
Water competitive adsorption and limited reaction sites on the micro-scale sensing area of micro-electro-mechanical system (MEMS) sensors are two bottleneck problems that restrict the detection of trace indoor polluted gases, leading to drifting and weak signals. To address this, a “duet-insurance” sensing strategy is proposed to protect and amplify the sensing signal. For the first-level protection, the well-designed double-layer structure consisting of Janus TpMa covalent organic framework (COF)/Eu-doped α-Fe 2 O 3 can resist diffusion of water molecules and facilitate the electron transfer from formaldehyde (CH 2 O) to sensing layers, benefiting from the outer hydrophobic character of Janus TpMa and the strong CH 2 O adsorption capacity of Eu-doped Fe 2 O 3 . For the second-level amplification, the unique variable temperature excitation facilitates the deep penetration of CH 2 O into the active sites across COF layers, enabling signal amplification through thermally actuated carrier modulation. The sensor demonstrates high sensing ability to the CH 2 O, with an ultra-low limit of detection of 794 ppt. Leveraging the novel sensing strategy, a multi-functional, visual sensing system is designed to identify multi-indoor pollution gases by feature signal encoding and color mapping, showcasing the promising potential for MEMS sensors based on Janus TpMa COF/Eu-doped α-Fe 2 O 3 materials.
研究领域:
材料科学
·
环境科学
·
化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）