Small
·
2021
·Vol. 17
·期 20
·2100137
·
IF 13.281
Ping Chen,Zexin Li,Dongyan Li,Lejing Pi,Xitao Liu,Junhua Luo,Xing Zhou,Tianyou Zhai
High color purity and color rendition of 2D luminescent materials have long been pursued for applications in low-dimensional lighting, display, biolabeling, and laser. However, the reported photoluminescence (PL) linewidth of most 2D luminescent materials is about dozens of meV. Herein, a brand-new luminescent system of 2D rare earth (RE) material EuOCl (1.1 nm) with ultra-narrow linewidth (1.2 meV) at room temperature is successfully synthesized via chemical vapor deposition (CVD). The linewidth of EuOCl flakes at room temperature is even narrower than most 2D luminescent materials and heterostructures detected at below 10 K. Impressively, the as-synthesized EuOCl flakes show abnormal temperature-dependent photoluminescent properties, which is absolutely different from the relatively stable 4f–4f transitions in RE owing to shielding from outer shell electrons. J-mixing effect has been successfully applied for this phenomenon. Undoubtedly, luminescent 2D EuOCl flakes will open new territory for the applications of 2D RE materials in the 2D luminescent areas, especially for the applications at room temperature.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Hongwei Yang,Yong Ren,Fang Xu,Yulong Liao,Xiaoyu Li,Guixiang Liu,Bo Dai
Prior studies predominantly utilized solid-state sintering to fabricate Ni-based ferrite ceramics, aiming to enhance magnetic properties. While some researchers have adopted the hot-pressing method for preparing these ceramics, the resultant porosity remained elevated (>2 %), leading to an increased ferromagnetic resonance linewidth (Δ H ). The impact of high temperature and pressure during the forming process on Δ H and gyromagnetic properties in nickel-based ferrite ceramics has been seldom explored using hot pressing. Building on prior research involving solid-state sintering of Ni-based ferrite, this study employed a vacuum hot-pressing sintering technique to further optimize the gyromagnetic properties of the ferrite. A systematic investigation was conducted to understand the influence of porosity, grain size, and microstructure on the magnetic attributes of Ni ferrite ceramics. Under conditions of high pressure (48 MPa) and zero holding time, as the hot-pressing sintering temperature rose from 800°C to 1050°C, the average grain size expanded from 0.4 μm to 3.36μm. Concurrently, the relative density and saturation magnetization initially increased before decreasing. Consequently, a NiCuZn ferrite characterized by uniform, dense grains (GS ave =1.94 μm and D r =99.2 %) and good gyromagnetic properties (4π M s =4703 Gs and Δ H =277 Oe) was achieved through hot-pressure sintering at approximately 950°C.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 4
·2845-2853
·
IF 2.22
Yang Yan,Li Jie,Zhang Huaiwu,Rao Yiheng,Wang Gang,Gan Gongwen
NiCuZn (NCT) ferrites-based ceramics material have received significant attention for good gyromagnetic properties in recent years. Densification and ferromagnetic resonance linewidth play a critical role in modern system including circulators, phase shifters. However, there are still technological challenges associated with its application to achieve high-performance communication system. In this work, we have carried out a analysis of the influence of sintering temperature and time on the dependent structural, tunable gyromagnetic properties of NCZ ferrites. SEM results found that a direct consequence of varying the sintering temperature and time to be on the variation in the grain size, thus adjusting the ferromagnetic resonance linewidth of NCZ ferrites. We also found that sufficient grain growth is adversely affect ferromagnetic resonance linewidth. Finally, uniform and compact NCZ gyromagnetic ferrites were successfully synthesized at a low temperature (~ 880 °C for 3 h). The fine microstructure of NCZ ferrites sintered at 880 °C for 3 h also possessed excellent gyromagnetic properties (high 4 πM s ≈ 3400.29 Gauss, and low Δ H ≈ 158.39 Oe). It was indicated that this greatly low ferromagnetic resonance linewidth of NiCuZn ferrites can be utilized for new generation high-performance microwave devices.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2024
·
IF 2.5
Zelai Cheng,Xi Wang,Xingyu Huo,Yulan Jing,Hua Su
Ni 0.42-x/3 Nb x /3 Cu 0.18 Zn 0.4 Mn x Fe 1.98− x O 4− δ ( x = 0–0.1) materials, possessing a high saturation magnetization, high dielectric constant, and narrow ferromagnetic resonance linewidth, were prepared via the solid-phase reaction method. The cation distribution, as well as the dielectric and gyromagnetic properties, were studied in detail. Mn 2+ and Nb 5+ incorporated in the lattice occupy tetrahedral site, causing the redistribution of cation and the reduction of A–B superexchange interaction. This leads to an increase in saturation magnetization followed by a decrease. The introduction of appropriate amounts of Mn 2+ and Nb 5+ ions reduces the magnetocrystalline anisotropy constant | K 1 | and thus reduces the ferromagnetic resonance linewidth ( ΔH ). Furthermore, high polarisability of Mn 2+ and Nb 5+ causes the increase in the dielectric constant of the ferrites. At x = 0.08, excellent gyromagnetic and dielectric properties, including a high dielectric constant ( ε ’ = 15.4@100 MHz), high saturation magnetization (4π M s = 4577 G), and narrow ferromagnetic resonance linewidth (Δ H = 129 [email protected] GHz) for the NiCuZn ferrite, was achieved. Finally, a K-band microstrip circulator operating at 20.8 to 28 GHz was designed. The simulation showed that the isolation of the circulator in the working frequency band is greater than 20 dB, showing the potential of the prepared ferrites in microwave circulators.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhixin Wang,Xiaohan Sun,Zilong Guo,Rubing Xi,Lingyun Xu,Zhihao Zhao,Yinghao Ge,Ziquan Cao,Xiangyu Jiang,Wensheng Yang,Lei Jiang
High-performance flexible transparent electrodes are the basis for the continuous upgrading of optoelectronic devices. Silver grids are attractive for replacing traditional indium tin oxide (ITO) as the premier transparent electrode materials, due to their high transmittance, excellent conductivity, and low cost. However, large linewidth and oxidation of silver grids are limiting the practical application of the resulting optoelectronic devices. Here, we report an effective and scalable solution-based method to prepare highly stable flexible transparent silver grid electrodes with submicron linewidth by the asymmetric wettability template-assisted self-assembly of silver nanoparticles (AgNPs), which is then encapsulated by a thin transparent conductive ionogel as protective layer. It is demonstrated that the linewidth of silver grids can be precisely controlled by the concentration of the AgNP dispersion. Wrapping with the ionogel nanolayer have no deterioration for conductivity and transmittance of the grid electrodes. The optimized hybrid grid electrodes exhibit low sheet resistance of 24.6 Ω sq −1 and high transparency of 99%. More importantly, the introduction of the iongel nanolayer endows the hybrid grid electrodes with excellent mechanical flexibility and thermal, electrical, and chemical stability. As a proof of concept demonstration, the submicron linewidth silver grid/ionogel hybrid films are successfully used to fabricate flexible smart windows and transparent touch panel. We envision that this work will shed new light on the development of next-generation optoelectronic applications which need ultrahigh resolution displays.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICS COMMUNICATIONS
·
2023
·
IF 2.4
Yongbao Xiao,Jinzhong Zhu,Ludong Kuang,Yao Ji,Qilai Zhao,Changsheng Yang,Weichao Wang
Single-frequency fiber lasers (SFFLs) are of pivotal importance across optical communication , scientific research and national defense due to their excellent beam quality, long coherent length and low noise. However, the development of high-gain rare-earth-doped glass fibers, which are the key medium used in the SFFLs, remains a critical scientific challenge. To address this issue, we design and fabricate a single-mode fluoro-sulfo-phosphate-based Er 3 + /Yb 3 + -codoped glass fiber (denoted as FSP-EYDF). The gain properties and laser performance of the FSP-EYDF have been investigated comprehensively. The results show that the small signal gain coefficient of the home-made FSP-EYDF can reach 4.7 dB/cm at 1535 nm, which is three times higher than that of the silica glass fiber. A short piece of FSP-EYDF with a length of only 1.6 cm has been utilized as a gain medium to support an SFFL operating at 1534.4 nm, which has a threshold of ∼ 18 mW and a linewidth of 3.15 kHz. This study indicates that high-gain FSP fibers are promising candidates for compact low-threshold narrow-linewidth SFFLs.
研究领域:
光学通信
·
材料科学
·
激光技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yan Yang,Jie Li,Jianxiong Zhao,Xia Chen,Gongwen Gan,Gang Wang,Linfeng He
Saturation magnetization and ferromagnetic resonance linewidth are important parameters for microwave devices, such as circulator/isolator. Conventional sintering of ferrite ceramics is prevalently performed to promote the densification. Here, we present a new sintering approach for obtaining uniform and dense NiCuZn ferrite ceramics with enhanced gyromagnetic properties at low temperatures. The NiZn-series ferrites (Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 3 – 1.0 wt% Bi 2 O 3 +0.5 wt% MnO 2 ) was synthesized by solid reaction routes with new sintering approaches. The results indicate that a one-transient-step sintering process (OTSP) can significantly improve the gyromagnetic properties at low sintering temperatures by suppressing the anomalous grain growth, such as higher saturation magnetization (4π M s = ∼3904 Gauss) and lower ferromagnetic resonance linewidth ( ΔH = ∼170 Oe). Therefore, such a methodology is quite significant due to it provides a referential experience for effective sintering route that can enable broad practical applications, such as other ferrite ceramics.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Flexible and Printed Electronics
·
2024
·Vol. 9
·期 2
·025009
·
IF 2.8
Shangjian Liu,Shuohao Hu,Song Lin,Jiakang Wu,Feng Shao,Junge Liang,Xi Wan,Xiaofeng Gu
Direct ink writing (DIW) represents a technical branch of additive manufacturing technology, particularly suitable for prototyping or small-batch printing production of printed electronic components. However, the existing print heads required for near or sub-100 μm line width are quite sophisticated, limiting the accessibility and application of the DIW method. This paper reports the use of the vibrating membrane ejector (VME) as a new option for the print head of DIW. The structure of the VME-based print head was specially designed for this purpose. Finite element modeling and analysis of the VME's vibration characteristics were performed to provide insights into the ejection conditions and behaviors. The factors influencing the size of printed structures were identified and analyzed through the printing of a metal–organic complex silver (Ag) ink. After optimizing several operational parameters to limit the spreading effects and suppress the satellite droplets, the DIW printed line width has reached about 100 μm. The effectiveness of the VME-based print head was further demonstrated through the DIW fabrication of interdigitated electrodes and microstrip transmission lines. This highlights the versatility of the VME-based print head as a practical tool for device prototyping and ink development in the field of printed electronics.
研究领域:
材料科学
·
印刷电子技术
·
制造工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wei Xiang,Lijun Jia,Tingqing Cai,Xuening Han,Mingchao Yang,Huaiwu Zhang
To meet high-power microwave system demands, low-temperature sintered Bi-Li-V substituted YIG ferrites were prepared. The experimental results reveal that Bi 3+ , Li + , and V 5+ occupy the c, a, and d sites of the garnet structure, respectively; the full-site distortion reduces the lattice activation energy, significantly reducing the transformation temperature from perovskite to garnet phase. Additionally, a dual structure with a high percentage of fine grains is observed in the substituted samples, which is an important reason for the large increase in spin-wave linewidth. Isothermal thermodynamic analysis indicates that a sintering mechanism dominated by liquid-phase sintering is conducive to the densification of YIG ferrites. Ferromagnetic resonance linewidth decomposition confirms that, due to the simultaneous increase in the saturation magnetization and the magneto-crystalline anisotropy constant, anisotropy-induced linewidth remains almost unchanged; the dense dual structure leads to a significant reduction in porosity-induced linewidth; ultimately, the ferromagnetic resonance linewidth is greatly reduced.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Fang Xu,Shuai Xiong,Yan Yang,Hongwei Yang,Yong Ren,Fei Xie,Guixiang Liu,Bo Dai
In this work, LiZnTi ferrites doped with various V 2 O 5 additives were successfully prepared using hot-press sintering. The influences of V 2 O 5 dopant amount and holding time on phase composition, microstructure and gyromagnetic properties of the low-sintered LiZnTi ferrite were studied. Results showed that the grain growth behavior of the LiZnTi ferrites was closely interrelated with dopant amount and holding time as result of changes of critical driving force ( Δg c ). Moreover, the relative density of all the ferrite samples was very high ( ρ r >99 %). However, we found that the longer holding time (can reduce Δg c ), which is benefit for grain growth and improvement of saturation magnetization (4π M s ) of LiZnTi ferrites, resulted in the deterioration of ferromagnetic resonance (FMR) linewidth ( ΔH ) instead. Finally, due to synergistic effect of applied pressure and V 2 O 5 dopant, the LiZnTi ferrite ( x = 0.10) sintered at 900 °C for 10 mins possessed a small average grain size (GS ave. = 0.69 μm ), very high relative density ( ρ r = 99.35 % ) , high saturation magnetization (4π M s = 4193.2 G s) and a relatively low ferromagnetic resonance linewidth ( ΔH = 449.1 Oe).
研究领域:
材料科学
·
无机非金属材料
·
磁性材料
·
电子陶瓷
·
功能材料
✓ 已验证
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Hanwen Lai,Guangcheng Huang,Xin Tian,Yadong Liu,Shengxiang Ji
The influence of line width roughness (LWR) and line edge roughness (LER) on the reliability and performance of transistors becomes more and more important in the semiconductor fabrication as the critical dimension continues shrinking. Directed self-assembly of block copolymers (DSA of BCPs) is a potential solution for next generation lithography, however, it still lacks research on the influencing factors of LER and LWR in DSA. Here we investigate the effect of the molecular weight distribution ( Ɖ ), normalized pattern period ( L S / L O ), pattern duty cycle (W/ L S ) and annealing time on the LER and LWR of domain boundaries in assembled poly(styrene- block -methyl methacrylate) (PS- b -PMMA) films on chemical patterns. The assembly kinetics is faster when the Ɖ of PS- b -PMMA is larger, while the Ɖ of PS- b -PMMA does not affect the L S / L O window for defect-free assembly when the annealing time is sufficient. Ɖ is the most critical parameter to control LER and LWR, and both increase with the increase of Ɖ on chemical patterns with same L S / L O . Besides Ɖ , L S / L O also plays an important role in the control of LER and LWR and the roughness increases with the increase of L S / L O . In addition, the annealing time and W/ L S of chemical pattern have little effect on LER and LWR. This will provide insight to engineer LER and LWR of block copolymer domains in DSA.
研究领域:
材料科学
·
半导体制造
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yan Yang,Jie Li,Huaiwu Zhang,Lichuan Jin,Fang Xu,Gongwen Gan,Gang Wang,Dandan Wen
The demand for high performance microwave devices is increasingly promoting the development of miniaturization, integration and multifunctionalization. Here, a uniform and dense NiCuZn ferrite ceramic with high saturation magnetization and low ferromagnetic resonance linewidth was obtained at 950 °C by adjusting the MnO 2 -Bi 2 O 3 composite additives. The MnO 2 -Bi 2 O 3 composite additives were composed of 0.5 wt% MnO 2 and x wt% Bi 2 O 3 (x = 0.0, 0.5, 1.0, 1.5, 2.0, and 3.0). The phase structure, microstructures and magnetic properties were systematically studied by means of modern measurement techniques. SEM images reveal that appropriate MnO 2 -Bi 2 O 3 additions can promote grain growth and reduce sintering temperatures , which is very advantageous for LTCC technology. In addition, the content of MnO 2 -Bi 2 O 3 additives can significantly reduce ferromagnetic resonance linewidth (FMR) by promoting grain growth and densification at low temperatures. Finally, a uniform and compact NiCuZn ferrite ceramic with an improved 4π M s (~ 3812.5 Gauss), a narrow Δ H (~ 144.6 Oe), and a reduced H c (~ 85.2 A/m) were obtained (at 950 °C) by adding the optimal volume of Bi 2 O 3 additive. It is expected that the improved gyromagnetic performances will allow the NiCuZn ferrite ceramics to be promising candidates for X-band microwave devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）