JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2012
·Vol. 12
·期 3
·2767-2773
·
IF 1.563
Zou Xing,Liu Jie,Peng Yingjie,Xu Bo,Yu Xibin
Uniform Y2O3 nanorods, nanosheets, nanotubes and nanoshperes were controllably synthesized via an urea-based homogeneous precipitation and hydrothermal synthesis through choosing appropriate yttrium sources, the water/ethanol ratio of mixed solvents and precipitators.
The nanopheres and nanotubes were obtained through homogeneous precipitation method using soluble yttrium nitrate as the yttrium source. The nanosheets and nanorods were obtained via a facile hydrothermal synthetic method using yttrium chloride and yttrium acetate as the yttrium source. During
these experiments Urea and NaOH were used as precipitators and added in correct order. We also studied the spectroscopic properties of Y2O3:Eu3+ phosphor. The Eu3+ ion mainly shows its characteristic red (611 nm, 5D0 →
7F2) emissions in all kinds of morphologies Y2O3:Eu3+ phosphor, but emission intensity are different. It can be explain from the viewpoint of their different absorption properties closely related to their micro-morphologies.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Science Letters
·
2012
·Vol. 10
·期 1
·274-278
·
IF 0
Liu Chenglu,Wang Fang,Zhou Zhiqiang,Jia Peiyun
YNbO4:Eu nano-phosphors were successfully prepared in NaNO3 molten salt. X-ray diffraction was used to characterize the structure of the samples. The results indicate that a suitable amount of NaOH in NaNO3 molten salt can effectively improve the crystallinity
of the samples annealed at same temperature; meanwhile, the elevation of annealing temperature increases the crystallinity, and transfers the crystalline phase from scheelite to fergusonite. The micrographs of transmission electron microscopy reveal that the grain size increases with the elevation
of annealing temperature. Upon excitation into the niobate groups at 260 nm, YNbO4:Eu nano-phosphors exhibit weak emission at 405 nm, originated from Nb–O charge transfer transition and the characteristic emission of Eu3+, which indicates there is an energy transfer
from niobate group to Eu3+. Monitored by emission of 615 nm, the excitation spectrum shows that the f-f transition of 7F0–5L6 at 396 nm is more intense than the Nb–O charge transfer band at 260 nm. This intense absorption at
396 nm make YNbO4:Eu nano-phosphors an excellent candidate of white light emitting diode.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
Nano Research
·
2014
·Vol. 7
·期 8
·1093-1102
·
IF 6.963
Chen Gen,Chen Fashen,Liu Xiaohe,Ma Wei,Luo Hongmei,Li Junhui,Ma Renzhi,Qiu Guanzhou
A facile biomolecule-assisted hydrothermal route followed by calcination has been employed for the preparation of monoclinic yttrium oxysulfate hollow spheres doped with other rare-earth ions (Yb 3+ and Eu 3+ or Er 3+ ). The formation of hollow spheres may involve Ostwald ripening. The resulting hybrid materials were used for upconversion applications. The host crystal structure allows the easy co-doping of two different rare-earth metal ions without significantly changing the host lattice. The luminescent properties were affected by the ratio and concentration of dopant rare-earth metal ions due to energy transfer and the symmetry of the crystal field. The type of luminescent center and the crystallinity of samples were also shown to have a significant influence on the optical properties of the as-prepared products.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 3
·1180-1188
·
IF 2.047
Ji Xinran,Zhou Ke,Zhao Ye,Sun Meiling,Dong Shijun,Zhang Hongbo,Cao Hechun,Zheng Hui,Wu Qiong,Zhang Yang
The regulation of magnetic and dielectric properties for yttrium iron garnet ferrites by ion doping is highly desirable in microwave devices. In this work, yttrium iron garnet ferrites co-doped with Pr-Zn-Zr atoms with the chemical formula Pr x Y 3-x Zn 0.1 Zr 0.1 Fe 4.8 O 12 (x = 0, 0.1, 0.15, and 0.2) were prepared. The dependence of the crystal structure, microstructure, magnetic, and dielectric properties of the obtained samples on the Pr doping concentration was investigated. The morphologies and crystal structure characterizations confirm that the Pr ion has effectively doped in the yttrium iron garnet ferrites and increased the lattice parameter and grain size. The magnetic characterization shows that the saturation magnetization also increases with the Pr concentration and obtains a maximum value of 27.68 emu/g at x = 0.15. Additionally, the doping of Pr increases the magnetic anisotropy constant K 1 which increases ferromagnetic resonance linewidth. Lastly, the dielectric properties measurement further indicates that Pr doping improves both real and imaginary parts of permittivity, and the highest value of the real part of the permittivity is obtained at x = 0.15. Consequently, the crystal structure, microstructure, magnetic properties, and dielectric properties of garnet ferrite can be effectively regulated by the Pr doping concentration, and excellent properties of the ceramic can be obtained at x = 0.15, which allows potential applications in microwave devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Siyi Yu,Xinyu Gong,Dongxin Shi,Mengchao Xue,Yuanyuan Zhang,Keke Han,Na Li,Guiqin Hou,Fengfeng Li
Traditional anti-counterfeiting materials have the characteristics of static display of anti-counterfeiting patterns and are easy to be disturbed by background patterns. Consequently, the development of novel luminous materials represents an imperative objective. As a novel class of matrix material, Sr 3 Y 2 Ge 3 O 12 has demonstrated considerable potential for application in the field of anti-counterfeiting. In this study, strontium yttrium germanate doped manganese ion long afterglow material was prepared by the high temperature solid phase method, and its afterglow performance and dynamic anti-counterfeiting application were studied. The experimental results show that the sample exhibits excellent luminescence characteristics. It is observed that the sample excited at 260 nm shows an emission band centred at 634 nm and a high-energy turning point at 578 nm. Using screen printing technology, design a variety of anti-counterfeiting labels. The prepared samples after ultraviolet excitation can maintain the pattern for a long time, and with the passage of time, the pattern shows dynamic attenuation, which is important in enhancing the anti-counterfeiting effect and improving product safety.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Muzhi Li,Huangyue Cai,Panpan Wang,Weilun Cheng,Hanchao Zhang,Xiaofeng Zhao,Di Peng
Thermal history sensors are valuable tools for thermal analysis of high-temperature components within aero-engines and gas turbines. However, most thermal history sensors have an upper temperature limit of ∼1200 °C, which is insufficient to meet the requirement of gas turbines. This study introduces a novel material for thermal history sensing capable of measuring temperatures up to 1400 °C. We show thermal history measurements based on the emission intensity ratio of a Eu 3+ -doped yttrium–aluminum mixture, whose luminescence characteristics undergo irreversible changes when exposed to high temperature. The primary mechanism is the decrease of the symmetry ratio owing to the phase transformation from YAG (Y 3 Al 5 O 12 ), YAM (Y 4 Al 2 O 9 ) to YAP (YAlO 3 ) utilizing the combination reaction of YAP induced by heat-treatment. The intensity ratio between 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 exhibits a monotonic decrease from 1.3 to 0.4 as the heat-treatment temperature increases from 1000 °C to 1400 °C. Moreover, we demonstrate that the irreversible change in intensity ratio after heat treatment remains insensitive to exposure time and oxygen partial pressure. Thus, the Eu 3+ -doped yttrium-aluminum mixture is a promising material for manufacturing high-temperature thermal history sensors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
SENSORS
·
2025
·Vol. 25
·期 3
·901
·
IF 3.5
Jian Wang,Caicai Sun,Jusheng Bao,Zhiwei Yang,Jian Zhang,Xiao Huang
Simple SummaryIn this work, Y-doped LTO nanosheets were synthesized for NO2gas sensing under different humidity conditions. These materials showed increased responses at higher humidity levels due to enhanced proton conduction and NO2-assisted proton generation. Notably, Y-doped LTO nanosheets exhibited higher responses than pure LTO, as Y-doping created more oxygen vacancies, improving water adsorption and proton dissociation.Water molecules from the environment or human breath are one of the main factors affecting the accuracy, efficiency, and long-term stability of electronic gas sensors. In this contribution, yttrium (Y)-doped La2Ti2O7(LTO) nanosheets were synthesized by a hydrothermal reaction, demonstrating improved proton conductivity compared to their non-doped counterparts. The response of Y-doped LTO with the optimal doping concentration to 100 ppm NO2at 43% relative humidity (RH) was −21%, which is four times higher than that of bare La2Ti2O7. As the humidity level increased to 75%, the response of Y-doped LTO further increased to −64%. Unlike the gas doping effect observed in previous studies of semiconducting metal oxides, the sensing mechanism of Y-doped LTO nanosheets is based on the enhanced dissociation of H2O in the presence of target NO2molecules, leading to the generation of more protons for ion conduction. This also resulted in a greater resistance drop and thus a larger sensing response at elevated humidity levels. Our work demonstrates that proton-conductive oxide materials are promising gas-sensing materials under humid conditions.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xinyang Wen,Huaicheng Xiang,Xin Mo,Qingfeng Li,Ying Tang,Liang Fang
To explore the effect of B-site ion variation in the garnet structure on the microwave dielectric properties, we introduced part of Y 3+ into Y 3 Ga 5 O 12 to form a series of Y 3 (Y x Ga 2- x )Ga 3 O 12 ( x = 0–0.9) ceramics. Rietveld refinements, based on the XRD data, reveal that the Y 3+ x Ga 5- x O 12 ( x = 0–0.8) ceramics crystallized in the garnet structure with the Ia -3 d space group, and two phases simultaneously coexisted in the x = 0.9 ceramics. The average B-site cations were compressed, A-site cations exhibited rattling, and the overall structure of Y 3+ x Ga 5- x O 12 ( x = 0–0.8) slightly expanded. As the concentration of Y 3+ at the B-site increased in pure-phase ceramics, the ε r (12.15–12.79) and τ f (−69.95 ∼ −60.72 ppm/°C) exhibited an upward trend, while the Q × f descended (101,902–79,209 GHz). The factors influencing the microwave dielectric properties were further examined by considering the ionic polarizability, bond valence, lattice energy, and packing fraction.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Yahui Song,Shengnan Wei,Yang Rong,Chunxiao Lu,Yang Chen,Jun Wang,Zhaohong Zhang
Several conduction band co-catalysts (CBCOs), MoO 2 , MoS 2 and MoSe 2 , were prepared to improve the visible-light photocatalytic hydrogen evolution activity of Er 3+ :Y 3 Al 5 O 12 /PdS–ZnS from water splitting, in which the PdS is a valence band co-catalyst (VBCO) used to facilitate the photo-generated hole transfer and the Er 3+ :Y 3 Al 5 O 12 is an up-conversion luminescence agent from visible light to ultraviolet light used to provide the ultraviolet light satisfying the energy demands of wide band-gap ZnS photocatalyst . XRD , SEM, TEM and EDX analyses were employed to confirm the morphology, microstructure and composition of the prepared photocatalysts. UV–vis absorption and PL spectra were also determined to explore luminescence effect of the Er 3+ :Y 3 Al 5 O 12 . The visible-light photocatalytic hydrogen evolution activity of the prepared photocatalysts was evaluated by using Na 2 S and Na 2 SO 3 as sacrificial reagents in aqueous solution under visible light irradiation . The influential factors such as contents of CBCOs (MoO 2 , MoS 2 and MoSe 2 ) and visible-light irradiation time on visible-light photocatalytic hydrogen evolution of Er 3+ :Y 3 Al 5 O 12 /PdS–ZnS–MoX 2 (X = O, S and Se) were investigated in detail. Particularly, Er 3+ :Y 3 Al 5 O 12 /PdS–ZnS–MoSe 2 with 0.30 wt% MoSe 2 shows the highest photocatalytic hydrogen evolution activity.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yi Zhang,Weidong Guo,Donghao Liu,Yigang Ding
The recovery of rare earth elements (REEs) from discharged electronic devices or mineral waste water is highly essential but still facing challenges. In this work, two amino-functionalized carboxyl-UiO-66 (UiO-66-COOH-TETA and UiO-66-(COOH)2-ED) prepared via the postmodification method were employed as the adsorbents for Yb(III) capture. The experimental results revealed their superior adsorption capacities of 161.5 and 202.6 mg/g, respectively. Meanwhile, their adsorption processes can be described by the pseudo-second-order kinetic model and Langmuir model. Effects of initial pH and temperature on adsorptions were systematically evaluated, affording an optimal operating condition (i.e., pH of 5.5–6, T of 65 °C, t of 10 h). Moreover, the fabricated materials exhibited great reusability after five adsorption–regeneration cycles. UiO-66-COOH-TETA demonstrated good separation selectivity for Yb(III) over light REEs (i.e., 3.98 of Yb/Ce, 3.51 of Yb/Nd). Based on the density functional theory calculations and characterization analysis (XPS, Zeta, mapping, and IR), the adsorption mechanisms were mainly attributed to significant electrostatic attraction and strong surface complexation between N and O sites and Yb(III).
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Le Zhang,Yue Ben,Hao Chen,Dingyuan Tang,Xianzhu Fu,Rong Sun,Bo Song,Chingping Wong
Highly transparent yttria ceramics were successfully fabricated by vacuum pre-sintering and post hot isostatic pressing (HIP) treatment both under very low temperatures synthesized from powders by a co-precipitated method. The morphologies and microstructures, density and thermal mechanical changes, and optical properties of ceramics under different processing stages were systematically characterized by (F)SEM, TMA, optical microscope and UV-Vis-IR spectrophotometer, respectively. The full densification of yttria ceramics could be achieved just at as low as 1450 °C for 4 h (vacuum pre-sintering) and 1400 °C for 3 h (post-HIP). The fabricated ceramics exhibited a uniform and fine microstructure and high optical performance. The average grain size was as small as 0.74 μm. The in-line transmittance reached 81.7% at 1100 nm (1 mm thickness). The transparent yttria ceramics were attractive without any sintering additives at such low pre-sintering and post-HIP temperatures.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Zhigang Jiang,Le Zhang,Fangzheng Zhen,Qing Yao,Wei Bu,Tianyuan Zhou,Yuelong Ma,Rong Sun,Hao Chen,Yun Wang
Well-dispersed Y 2 O 3 powders were synthesized by a precipitation method from yttrium nitrate solution using (NH 4 ) 2 SO 4 and PEG4000 as the composite surfactant , and the dispersion mechanism of the composite surfactant was investigated in detail. Furthermore, the grain size, densification, mechanical and optical quality of as-prepared ceramics were also discussed. The dispersion state of both precursors and Y 2 O 3 powders could be remarkably effected by the mass ratio of (NH 4 ) 2 SO 4 and PEG4000 during the liquid phase reaction process. When the function of electrostatic repulsion and the steric hindrance were combined properly, the aggregation state of powders could be effectively inhibited. With the addition of the mass ratio of 3:2 ((NH 4 ) 2 SO 4 to PEG4000), fine powders (130 nm) with high dispersion state were obtained. Meanwhile the Y 2 O 3 ceramics with an average grain size of 3.65 µm were fabricated by sintering at 1750 °C for 8 h.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）