JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zesheng Li,Fangyu Gan,Juncheng Han,Qingrong Yao,Lichun Cheng,Jiang Wang,Jianqiu Deng,Zhao Lu,Qianxin Long,Yan Zhong,Huaiying Zhou,Guanghui Rao
Y 2 O 3 has emerged as a promising material for electromagnetic wave (EMW) absorption due to its excellent dielectric properties . However, the inherent insulating nature and single loss mechanism limit its absorption performance. Research on the microstructure modulation and component regulation of Y 2 O 3 -based absorbers remains relatively unexplored. In this work, Y 2 O 3 /C composites with flower-like architectures were synthesized for the first time via a metal-organic framework (MOFs) templating method. The effects of pyrolysis temperature on the microstructure, phase composition, and EMW absorption performance of the Y 2 O 3 /C composites were systematically investigated. At a pyrolysis temperature of 800 °C, the flower-like Y 2 O 3 /C microsphere exhibited optimal EMW absorption performance. The minimum reflection loss (RL) of pristine Y 2 O 3 was only −4.75 dB, while the Y 2 O 3 /C composite achieved a minimum RL of −51.77 dB and a maximum effective absorption bandwidth of 4.32 GHz. Moreover, by simply adjusting the matching thickness, the optimal sample exhibited strong absorption (RL < −30 dB) over a wide frequency range of 4–18 GHz. The incorporation of carbon effectively neutralized the insulating nature of Y 2 O 3 , thereby optimizing the impedance matching . The synergistic effects of multiple loss mechanisms, including polarization loss, resistance loss, and interfacial polarization, facilitated substantial EMW attenuation . This study provides a promising strategy for the design and fabrication of high-performance rare-earth oxide EMW absorbers with tunable morphologies and properties.
研究领域:
材料科学
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电磁材料
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纳米技术
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复合材料
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 3
·1362-1372
·
IF 2.956
Shunjie Deng,Chi Jiang,Tianwei Liu,Yin Hu,Jingjing Ding,Maobing Shuai
Al 2 O 3 -Y 2 O 3 -SiC composite coatings were prepared on depleted uranium by cathode plasma electrolytic deposition in Al(NO 3 ) 3 , Y(NO 3 ) 3 , SiC nanoparticles and anhydrous ethyl alcohol mixture. The resulting coating consisted of an inner barrier layer and an outer porous layer. The SiC nanoparticles were incorporated into the composite coating and decreased the coating porosity by filling the pores. The potentiodynamic polarization test and neutral salt spray test revealed that the corrosion resistance of depleted uranium was enhanced by the composite coating. Moreover, with increasing the content of SiC nanoparticles in the coating, the coating corrosion resistance was improved gradually.
研究领域:
材料科学
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表面工程
·
腐蚀科学
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产品关联
DOI
高影响因子
JOURNAL OF AEROSOL SCIENCE
·
2025
·
IF 2.9
Shuting Lei,Yiyang Zhang,Zhu Fang,Xing Jin,Shuiqing Li
Spray flame synthesis has proven to be a promising method for the high-throughput production of multi-component nanoparticles with atomic-level mixing. However, the fast dynamic of flame synthesis presents significant challenges in precisely controlling the morphology and crystalline phase of the particles, especially for multi components. In this paper, we conduct parametric flame synthesis experiments to identify key factors affecting nanoparticle morphology and crystal phase of Y-Al nanoparticles, focusing on the effects of Y/Al atomic ratio, flame temperature, and precursor volatility. The results indicate that the particle morphology depends on the composition, changing from aggregates with sintering necks to spherical particles without sintering necks and back to aggregates as the Al content increases. This trend is consistent with the change in particle melting points, which initially decrease and then rise again. Thus, the variation in melting point causes changes in sintering time, which in turn affect the particle morphology. The particle crystalline phase gradually deviates from the target phase as the Al content increases. Raising the adiabatic flame temperature from 1551 °C to 2340 °C accelerates the diffusion of Al atoms into the lattice, increasing the target phase proportion in the synthesized particles from 66 % to 99 %. By adjusting the amount of 2-ethylhexanoic acid (EHA) added, the volatility differences between the precursors can be modified. The largest discrepancy in precursor volatility is observed when EHA was added at a 50 % equivalence ratio, resulting in only 6 % of the target phase YAH (YAlO 3 , hexagonal type) in the particles. Increasing the EHA addition to 120 % equivalent results in better matching of precursor volatilities, which leads to a significant increase in the target YAH phase to 98 %, demonstrating the critical role of simultaneous evaporation of different component precursors.
研究领域:
材料科学
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纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Tianzhi Jiang,Renguang Ye,Xinfeng Jin,Weigang Guo,Xiaoqing Liu,Shilong Zhao,Junjie Zhang,Shiqing Xu
Realization and optimization of enhanced/tunable optical luminescence properties is highly demanded for reliable and accurate temperature sensing. In this work, uniform monodisperse spherical Er 3+ /Yb 3+ co-doped Y 2 O 3 microcrystals of four different sizes have been synthesized via homogeneous precipitation by changing the reaction time, and the tuning of luminescence intensity/color was achieved by the controllable particles size. On this basis, by studying the particle size dependence of temperature sensing performance, we found that the behavior of absolute sensitivity ( S a ) and relative sensitivity ( S r ) have highly size dependence. Interestingly, when different FIR strategies were used (thermally coupled levels (TCLs) and nonthermally coupled levels (non-TCLs)), the sensitivity exhibits the opposite behavior. Importantly, when using the non-TCLs strategy, the maximum S a value for the smallest phosphors was 1.084 K -1 , leading to ∼246 times improvement compared to TCLs-based S a . The ultrahigh S a indicated that the Er 3+ /Yb 3+ co-doped Y 2 O 3 phosphors have potential in temperature detection, and the results are of guiding significance to studying the sensitivity of Y 2 O 3 particle size-dependent temperature measurement.
研究领域:
材料科学
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光学
·
纳米技术
·
温度传感
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Ben Ma,Kai Li,Bo Chi,Jian Pu,Jian Li
LaNbO 4 –NiO–Y 2 O 3 stabilized ZrO 2 (YSZ) composites are prepared and investigated as an anode-support material for solid oxide fuel cells. To tailor the coefficient of thermal expansion (CTE), electrical conductivity, fracture strength σ and fracture toughness K IC of the composite, various amounts of LaNbO 4 from 0 to 30 wt.% are added into 53 wt.% NiO–47 wt.% YSZ composite. With LaNbO 4 addition into the NiO–YSZ, σ changes insignificantly, whereas CTE decreases and K IC increases monotonously. For 30 wt.% LaNbO 4 –NiO–YSZ, the CTE is 12.4 × 10 − 6 K − 1 (250–1000 °C), which is much closer to that of YSZ, and the K IC is 3.1 MPa-m 1/2 , which is 42% increase compared with that of the NiO–YSZ. The increase in fracture toughness is possibly due to the domain switch within LaNbO 4 and the overall grain refinement of the composite. The electrical conductivity of the reduced composites decreases with increasing the amount of LaNbO 4 and shows metallic conducting behavior with temperature.
研究领域:
材料科学
·
能源工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2020
·
IF 4.142
Xueliang Jiang,Zitong Peng,Yanrong Gao,Feng You,Chu Yao
Using melamine-formaldehyde as template, tetrabutyl titanate as titanium source, and ytterbium nitrate as ytterbium source, the Ag-loaded double-shell TiO 2 @Y 2 O 3 hollow microspheres with TiO 2 as inner layer and Y 2 O 3 as outer layer were prepared by sol-gel method and high-temperature calcinations reduction. The characterization of hollow microspheres shows that the Ag-loaded TiO 2 @Y 2 O 3 hollow microspheres show regular morphology, uniform size and distinct double-shell hollow structure. Ag exists as the zero-valent form in the double-shell hollows spheres mainly. The results of Uv-visible diffuse reflection analysis and photocatalytic testing under visible-light show that the forbidden band widths narrowed and the photocatalytic activities improved significantly after the load of Ag. Moreover, the location of loaded-Ag has great effect on the photocatalytic activity of TiO 2 @Y 2 O 3 hollow microspheres. Compared with Ag located on the surface of the hollow microspheres, Ag located between the two shells of the hollow microspheres improved their photocatalytic activity more effectively.
研究领域:
材料科学
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化学
·
光催化
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
LUMINESCENCE
·
2021
·Vol. 37
·期 2
·348-356
·
IF 2.464
Shilin Shen,Zerong Long,Yi Lu,Jia Chen
A novel double-windows fluorescence sensor for carbofuran (CF) detection was successfully developed based on rare-earth Eu,Tb-doped Y 2 O 3 @SiO 2 -based molecularly imprinted nanoparticles (MINs) with a multilayer core-shell structure. The recognition process of the MINs for CF was fairly fast and needed only ~8 min to reach a dynamic equilibrium. Interestingly, one fluorescence attenuation window was found with an increase in CF concentration ( Q ) from 0.1 to 10 μg ml −1 and with a limit of detection (LOD) of 0.04 μg ml −1 at 544 nm belonging to the Tb 3+ emission, as well as another fluorescence enhanced window within the CF concentration range 10–100 μg ml −1 (LOD = 4 μg ml −1 ) at 617 nm of Eu 3+ emission in the dispersed rare-earth-doped MIN colloidal aqueous solution. Luminescence resonance energy transfer from CF to Eu 3+ and an inner filter effect of CF towards Tb 3+ , as well from the two independent detection windows were clearly observed simultaneously. The competition experiment displayed hardly any marked interference during detection of CF following addition of its analogues (carbaryl, isoprocarb, aldicarb, methomyl, and etofenprox). Moreover, the MINs could also be applied to accurately detect CF in rhubarb and wolfberry samples with recoveries of 85.7–92.2%. This sensing system has high specific recognition and a wide detection range for CF and provides new opportunities for pesticide detection.
研究领域:
分析化学
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纳米技术
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环境科学
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农药检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2024
·
IF 1.3
Haifan Chen,Gongwei Xia,Jianfang Chen,Hao Zheng
Phenolic compounds are considered to be major environmental pollutants because of their toxicity and hazard on the marine ecosystem and human health even at low concentrations. An ultrasensitive biosensor was fabricated by immobilizing polyphenol oxidase into a composite of transition metal carbides (MXene)-yttrium oxide (Y 2 O 3 ) for the detection of catechol in environmental water bodies. The morphology and electrochemical performance of the as-prepared biosensors were investigated using scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV), respectively. Under the optimal pH value and applied potential, the biosensor exhibited a linear response range from 0.04 to 3.2 µM (R 2 = 0.9974) with an excellent sensitivity of 2294.8 mA·M −1 . The limit of detection (LOD) was found to be 7 nM (S/N = 3) with acceptable repeatability and reproducibility. The interference from ascorbic acid, uric acid, CuSO 4 , MgSO 4 , FeCl 3 , CaCl 2 , and ZnSO 4 was also investigated. The proposed biosensor was used for the determination of trace catechol in real water samples with satisfactory results compared with that of HPLC. The construction of MXene-Y 2 O 3 composite is expected to be a platform for immobilizing enzymes to prepare versatile electrochemical biosensors.
研究领域:
环境科学
·
分析化学
·
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2016
·
IF 4.055
M.M. Mikhailov,V.V. Neshchimenko,Chundong Li
This study carried out on the diffuse reflective spectra of zinc oxide modified by Al 2 O 3 , ZrO 2 , SiO 2 , CeO 2 , TiO 2 and Y 2 O 3 nanoparticles . It was established that during the modification are formed the solid solutions between zinc oxide and nanopowder as Al 2 ZnO 4 , ZrZnO 3 , Zn 2 SiO 4 , Ce x Zn (1−х) О y , Zn 2 TiO 4 , Y x Zn (1−x) O y . The diffuse reflection spectra of the modified powders are changed in the UV and visible range with a maximum at 395 nm. This band is determined by the intrinsic point defects in the crystal lattice of ZnO as interstitial zinc ions and zinc vacancy. In the IR region also recorded changes due to the absorption of OH-groups adsorbed on the surface modified zinc oxide.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Man Li,Yifei Zhao,Shuai Zhang,Ruirui Yang,Weidong Qiu,Pin Wang,Maxim S. Molokeev,Shi Ye
The photoinduced reversible ion exchanges in mixed halide perovskites and the resulting luminescent variations make them promising for constructing anti-counterfeiting patterns; however, its understanding in an interfacial view is lacking. In this work, nominal CsPbBr1.5Cl1.5 (CPBC) nanocrystals (NCs) were introduced into macroporous Y2O3:Eu3+ (MYE) to realize emission color variations from red emission of MYE to green emission of halide NCs. The large surface area of MYE helps the formation of Y–Cl/Br bonds which induces fluctuation in the halide composition, while water and intrinsic halogen defects have also been proved to be essential in the reversible ion segregation process. The PL variations of several samples with different pore sizes were investigated upon irradiation of light with different photon energies and excitation power at certain temperatures. According to combined results of density functional theory calculation, the research reveals the presence of two energy barriers that would be overcome correspondingly by the excitation photon and the concentration difference in the ion exchange and recovery process. A photochromic anti-counterfeiting quick response (QR) code was constructed facilely with the perovskite composites. This work provides a deeper understanding from the interfacial aspect and also proposes a feasible strategy to realize reversible PL variation for anti-counterfeiting applications.
研究领域:
材料科学
·
光学
·
纳米技术
·
防伪技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Boxu Xu,Chao Song,Jie Song,Rui Huang,Zhenxu Lin,Yi Zhang,Shaomin Lin,Jun Song
In this study, a series of well-crystallized Yb 3+ /Er 3+ /Tm 3+ -tridoped Y 2 O 3 –ZnO ceramic phosphors were prepared using sol–gel synthesis, and the phosphor structures were studied using X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis . The phosphors had excellent physical stability and porous structure. All phosphors generated blue, green, and red emission bands attributed to Tm: 1 G 4 → 3 H 6 , Er: 2 H 11/2 ( 4 S 3/2 )→ 4 I 15/2 , and Er: 4 F 9/2 → 4 I 15/2 radiative transitions , respectively. The emissions were intensified twice by tuning the Tm 3+ ratio in the host matrix Y 2 O 3 and ZnO parts. The color coordinates were adjusted by tuning both the Tm 3+ concentration and the excitation laser pump power to shift the color coordinates and only enhance the brightness, respectively. Meanwhile, heating phosphors can also linearly adjust the color coordinates of the luminescence. Therefore, it can also be used as a fluorescence thermometer in the field of temperature sensor . The study findings will broaden the phosphor practical application potential.
研究领域:
材料科学
·
光学
·
陶瓷
·
发光材料
·
温度传感
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2026
·
IF 4.4
Chunxiao Han,Chunmei Xiahou,Luna Ruan,Zhongpeng Lu,Qi Gong,Yulin Gao,Lihua Zhu
Rare-earth (RE) elements are often employed to optimize electrocatalytic performance due to their tunable electronic structures and surface properties. Herein, a yttrium oxide-doped Pt-based catalyst (Pt–Y2O3/C) is engineered for the electrocatalytic methanol oxidation reaction (MOR), and the surface Y/Pt atomic ratio is precisely modulated to optimize its performance. Pt–Y2O3/C-2 (1/0.17 Pt/Y atomic ratio, Pt loading of 4.73 wt %) exhibits optimal mass activity (MA) for MOR, 5.10 A mgPt–1 in 1.0 M KOH with 1.0 M CH3OH, obviously outperforming commercial 20 wt % Pt/C by a factor of ∼12.8. It also shows superior CO-poisoning tolerance and stability; its MA for the MOR remains at 3.80 A mgPt–1 after the 10 000 s stability test. Integrated characterization results demonstrate that Y2O3 doping induces an electronic interaction with Pt, thereby reducing the electron density of Pt and optimizing its electronic structure, attenuating the adsorption of CO* intermediates at the Pt sites. Y2O3 doping also decreased the charge transfer resistance (Rct) in the MOR. The superior MOR performance of the Pt–Y2O3/C-2 catalyst originates from its uniformly sized Pt–Y2O3 nanoparticles and unique electronic effect. This work highlights the regulatory role of the rare-earth metal in Pt-based catalysts for the MOR, offering a general strategy for achieving excellent catalytic performance.
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产品关联
DOI
高影响因子
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