INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Yanan Wang,Man Wang,Honghong Sun,Kangyao Tang,Xiaoli Xi,Zuoren Nie
Oxide dispersion strengthened tungsten (ODS-W) alloys are promising plasma facing material in future fusion reactors. In this study, composite powders of W-Er 2 O 3 were prepared by co-deposition method and hydrogen reduction, and then consolidated by spark plasma sintering (SPS). Microstructure evolution during co-deposition process was investigated using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and Fourier transform infrared spectrometer (FTIR). Also, simulation using DMol3 module in Materials Studio was carried out to understand the co-deposition mechanism. The results showed that H + of W-OH bond in white tungstic acid was replaced by Er 3+ due to coordination reaction during co-deposition process, leading to formation of ring-like chelate of (WO) n Er. This indicates that doping of Er 3+ was achieved at a molecular level. Consequently, Er 2 O 3 particles were relatively uniformly distributed in W-Er 2 O 3 alloy, and the hardness and compressive strength reached 627 ± 19 HV and 1640 ± 40 MPa, respectively.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Zhenjie Liu,Yue Zhang,Yudai Huang,Xingchao Wang,Juan Ding,Yong Guo,Xincun Tang
Hierarchical lithium titanate@erbium oxide (Li 4 Ti 5 O 12 @Er 2 O 3 ) microspheres from coating to doping were successfully synthesised by a simple and scalable one-step co-precipitation method. Microscopic observations revealed that the Li 4 Ti 5 O 12 @Er 2 O 3 microspheres present a well-defined hierarchical structure and that Li 4 Ti 5 O 12 is coated by the Er 2 O 3 layer. The X-ray photoelectron spectroscopy (XPS) results demonstrate that partial Ti 4+ is reduced to Ti 3+ and induces oxygen vacancy because partial Er 3+ dope into octahedral 16d Li + /Ti 4+ sites of Li 4 Ti 5 O 12 . Owing to the hierarchical microsphere structure, Er 2 O 3 coating, and Er 3+ doping, the material exhibits excess rate capacity (183.7 mAh g −1 at 30C). The hierarchical microsphere structure shortens the diffusion pathways for Li + ions. The Er 2 O 3 coating on the surface reduces the adverse interface reaction . Importantly, oxygen vacancy induced by Er 3+ doping enhances Li + ion diffusion kinetics and offers extra space to store Li + ions, which endows this sample with excess rate capacity.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
固态化学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 8
·2404698
·
IF 26.8
Panqi Huang,Youxuan Wu,Meng Gao,Junxin Chen,Bowen Ma,Jiuxiang Dai,Jing Zhang,Ziye Zhu,Wen Xiao,Zhitong Jin,Wu Zhou,Wenbin Li,Ya-Qing Bie,Lin Zhou
Van der Waals (vdWs) materials are promising candidates for hetero-integration with silicon photonics toward miniaturization and integration. VdWs materials like molybdenum telluride and black phosphorus, despite being prominent, exhibit air sensitivity, and their room temperature emissions can be significantly broadened by tens of meV. Here, a self-encapsulation strategy is developed to scalably synthesize robust 2D vdWs ErOCl with sub-meV narrow emissions at the telecom C-band. Diverse 2D rare earth materials are also grown via chemical vapor deposition (TmOCl, YbOCl, HoOCl, DyOCl, SmOCl, NdOCl, TbOCl, GdOCl, EuOCl, and PrOCl), demonstrating the strategy's generalizability. The as-grown ErOCl exhibits high crystalline quality and excellent ambient and thermal stability (300 °C). Photoluminescence analysis reveals a series of narrow emissions across the visible to near-infrared spectrum. The ErOCl's emission at the telecom band is narrowest among 2D luminescent materials, and suitable for integrating with photonic chips. Temperature-dependent photoluminescence spectra facilitate the understanding of emission mechanisms, analyzed using a crystal field perturbation model. Moreover, these emissions can be tuned by external magnetic fields. This research not only pioneers a novel strategy for synthesizing 2D rare earth materials but also paves the way for innovative building blocks in the realm of on-chip optical communications.
研究领域:
材料科学
·
纳米光子学
·
光电子学
·
量子材料
·
集成光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Xuekai Wang,Yongze Cao,Xianglan Yan,Guojian Li,Xiangping Li,Jinshu Zhang,Baojiu Chen
Hexagonal Er 3+ /Yb 3+ co-doped LaZrTa 3 O 11 (LZTO) phosphor was prepared by molten salt synthesis with B 2 O 3 flux. Holding temperature, holding time, solute and solvent ratio were regulated. The green upconversion luminescence (UCL) integral intensity of the optimal sample can reach 29.2% of β-NaYF 4 :Er 3+ /Yb 3+ under 980 nm laser excitation. This outstanding pure green UCL is due to the low phonon energy, Er 3+ /Yb 3+ monolayer (2D) distribution, asymmetry of Er 3+ /Yb 3+ doped lattice sites, and low oxygen vacancy. The maximum relative temperature sensitivity attains 0.01221 K −1 at 303 K by employing luminescence intensity ratio (LIR) technique. LZTO:Er 3+ /Yb 3+ phosphor can be used in temperature sensing.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Bing Qi,Wenjing Dai,Bibo Lou,Bin Song,Ziyun Miao,Yurong Wei,Chonggeng Ma,Jie Wang
Lanthanides are widely codoped in persistent luminescence phosphors (PLPs) to elevate defect concentration and enhance luminescence efficiency. However, the deleterious cross-relaxation between activators and lanthanides inevitably quenches persistent luminescence, particularly in heavily doped phosphors. Herein, we report a core–shell engineering strategy to minimize the unwanted cross-relaxation but retain the charge trapping capacity of heavily doped persistent luminescence phosphors by confining the activators and lanthanides in the core and shell, respectively. As a proof of concept, we prepared a series of codoped ZnGa2O4:Cr, Ln (CD-Ln, Ln = Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb) and core–shell structured ZnGa2O4:Cr@ZnGa2O4:Ln (CS-Ln) nanoparticles. First-principles investigations suggested that lanthanide doping elevated the electron trap concentration for enhancing persistent luminescence, but energy transfer (ET) from Cr3+ to Ln3+ ions quenched the persistent luminescence. The spatial separation of Cr3+ and Ln3+ ions in the core–shell structured CS-Ln nanoparticles suppressed the ET from Cr3+ to Ln3+. Due to the efficient suppression of deleterious ET, the optimal doping concentration of Ln in CS-Ln was elevated 50 times compared to CD-Ln. Moreover, the persistent luminescence intensity of CS-5%Ln was up to 60 times that of the original ZnGa2O4:Cr. The CS-5%Ln displayed significantly improved signal-to-noise ratios in bioimaging. Further, the CS-Ln was interfaced with the lycopene-producing bacteria Rhodopseudomonas palustris for solar-to-chemical synthesis, and the lycopene productivity was increased by 190%. This work provides a reliable solution to fulfill the potential of lanthanides in enhancing persistent luminescence and can further promote the applications of persistent luminescence phosphors in biomedicine and solar-to-chemical synthesis.
研究领域:
材料科学
·
生物医学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Saisai Zhu,Jinpeng Zhu,Songbo Ye,Yaning Zhang,Songtao Zhang,Kaijun Yang,Mingliang Li,Han Zou,Hailong Wang,Jilin He
High-entropy rare earth titanates (Y 0.2 Gd 0.2 Ho 0.2 Er 0.2 Yb 0.2 ) 2 Ti 2 O 7 (YHT) have great application potential in the thermal protection coating field. In this work, the YHT coating was successfully prepared by atmospheric plasma spraying. The influence of different spraying powers and coating ablation behavior by plasma flame on the phase composition and microstructure morphology of the coating surface , cross-section and fracture surface were investigated using X-ray diffraction, scanning electron microscopy and atomic force microscope. Results show that the YHT powder has a sufficiently melted state before impacting the metal substrate and the coating can be effectively deposited through optimizing the plasma spraying power. And the YHT coatings undergo slight sintering, leading to the formation and growth of a spherical structure at 1200 °C, while the grain preferential growth, mechanical failure and water-like structure occurred due to strong thermal shock at 1400 °C. In addition, when the coating surface temperatures are 1200 °C and 1400 °C, the corresponding heat insulation temperatures are 590 °C and 620 °C, respectively, indicating that YHT coating has good thermal insulation ability. This study provides a powerful theoretical basis and technical support for the application of high-entropy rare earth titanates YHT as a thermal protection material for high temperature devices.
研究领域:
材料科学
·
热防护技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 48
·19487-19497
·
IF 5.7
Dangli Gao,Chengxue Du,Yuqiang Wang,Wenqian Xu,Wenna Gao,Qing Pang,Yuhua Wang
The management of multicolour and multimode luminescence in persistent luminescence (PersL) materials plays a crucial role in encrypting information to combat forgery. Although luminescent anti-counterfeiting has made significant progresses, anti-counterfeiting signals only exhibit typical luminescent emission colours of materials under fixed external stimuli, which makes them susceptible to be replicated. Here, we developed a series of LiReGeO4:Bi,Ln (Re = Lu, Y and Gd, Ln = Eu, Tb, Pr, Yb, Sm, Tm, Ce, Dy and Er) phosphors with multicolour and on-demand controlled PersL emission through purposeful design of the electron–hole pair trap structure. Besides the multicolour and multimode emission, these phosphors demonstrated a temporal memory function for writing information, which provides a new dimension for higher-order anti-counterfeiting. As an example, LiLuGeO4:Bi,Ln (Ln = Eu, Tb, Pr and Yb) memory phosphors display the pattern signals in the order requested by the owner, which makes any sophisticated forgery technique powerless. The study here provides not only a simplistic method for constructing a new-type persistent memory material, but also a new paradigm of artificial intelligence memory for anti-counterfeiting technology.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Guangdong Wu,Juanqin Xue,Zhaoyuan Cao,Yanyan Zhou,Qiang Bi,Yan Zhao,Zhihua Leng
Constructing heterojunction photocatalysts that can make additional utilization of near-infrared (NIR) light has been a global scientific problem and has gained widespread research interest. Upconversion nanoparticles (UCNPs) collaborate with semiconductors to construct UCNPs-based photocatalysts that are used to improve solar energy utilization. In this work, the as-prepared UCNPs-based photocatalysts consisting of NaGdF 4 :Yb 3+ /Er 3+ (NGFYE) and bismuth oxyiodide (BOI) are synthesized by chemical epitaxial growth method and in-situ calcination process. The crystalline phase , morphology, optical and electrochemical properties of NGFYE@BOI samples are investigated in detail. Besides, Bi 4 O 5 I 2 /Bi 5 O 7 I Z-type heterojunction is confirmed by EPR test. Moreover, the photocatalytic elimination of tetracycline hydrochloride (TCH) and its photocatalytic mechanism by NGFYE@BOI samples are explored. This work may provide a promising idea for the efficient and controlled synthesis of UCNPs-based photocatalysts, which will contribute to the future utilization of solar energy.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Haitang Hu,Chuancheng Zhang,Yong Zou,Wenpeng Liu,Shoujun Ding
A series of 10 at% Yb3+, 5 at% Er3+ co-doped NaGd(MoxW1-xO4)2 (x = 0.5, 0.7 and 0.9) single crystals were grown by Czochralski method. X-ray diffraction (XRD), Rietveld refinement and FT-IR analyses were employed to comprehensively analyze the crystal structure. The results firmly established that the crystals belong to the tetragonal system, with the space group identified as I4₁/a. In addition, the 1.5 μm spectral properties of the crystals were investigated, including emission, absorption and fluorescence decay characteristics. Importantly, the study delved deep into uncovering how the crystal's composition impacts its spectroscopic properties. As the crystal composition changes, there is a notable inhomogeneous broadening of the spectral. A maximum full width at half-maximum (FWHM) at 1535 nm was obtained to be 83 nm in (MoO4)1.0(WO4)1.0 composition crystal. However, the maximum absorption and emission cross-sections were achieved in (MoO4)1.4(WO4)0.6 component crystal with values of 1.15 × 10-20 cm2 and 1.05 × 10-20 cm2, respectively. Besides, for (MoO4)1.4(WO4)0.6 composition crystal, a positive gain cross-section is obtained at around 1535 nm for a population inversion ratio β above 0.4. The results show that double molybdate/tungstate mixed crystals co-doping with Yb3+ and Er3+ are promising for 1.5 μm near-infrared solid-state lasers.
研究领域:
光学材料
·
固体物理
·
激光科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 25
·1-14
·
IF 2.8
Qian Wanqing,Xu Qingliang,Yu Xueqing,Hussain Fayaz,Chen Xinhua,Su Weitao,Sun Shikuan,Song Kaixin
To develop new luminescent materials for optical thermometers, a series of Er 3+ /Eu 3+ doped double perovskite La 2 MgSnO 6 phosphors are synthesized by a high-temperature solid-phase method. The structure, luminescence performance, energy transfer, and thermal sensitivity are systematically studied by X-ray diffraction (XRD), scanning electron microscopy fluorescence spectroscopy, lifetime decay curve, and temperature-dependent emission spectra. The prepared samples possess good coincidence with pure perovskite phase, and the refined high-quality XRD data reveal that Eu 3+ and Er 3+ jointly occupy La 3+ sites. which is attributed to the effective energy transfer from Er 3+ to Eu 3+ ions. By adjusting the doping concentration of Eu 3+ , the emission of Er 3+ is attenuated and the luminous color is modulated from green to orange-red. These demonstrate the existence of energy transfer between Er 3+ and Eu 3+ . In addition, the optimized La 2 MgSnO 6 : 0.075Er 3+ , 0.04Eu 3+ phosphor exhibits excellent thermal stability and good temperature cycling. The emission intensity showed good cycling in the process of repeated heating and cooling, and maintained to 76% of the initial temperature (303K) at 403K. Studied the optical temperature sensing performance of LMS: 0.075Er 3+ , 0.04Eu 3+ fluorescent powder. The results of fitting the fluorescence intensity ratio with the non-thermal coupling characteristic peaks of 555 and 706nm showed excellent optical sensitivity, and the S a and S r were calculated as 0.0029K −1 and 1.21%K −1 , respectively. All results indicate that LMS: 0.075Er 3+ , 0.04Eu 3+ phosphors could have potential applications for non-contact optical temperature measurement materials.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaona Zhang,Yubin Tang,Shulin Liu,Ying Zhang
Multiple myeloma is the second most common hematologic malignant tumor, which can result in complications such as osteolytic fractures and bacterial infections. The side effects of chemotherapy limit the dosage of drugs, which can easily lead to multidrug resistance. Moreover, the dose and distribution of drugs within the body significantly influence the therapeutic efficacy of drugs. Therefore, it is highly necessary to improve multidrug resistance and bacterial infection in the treatment of multiple myeloma, repair bone defects caused by bone pain, and monitor the real-time dynamics of drugs. This work proposes a novel rare earth oxide-inorganic composite (7Li-MBGs:2Er/2Yb-0.75MTO) as a drug delivery platform for the treatment of multiple myeloma. 7Li-MBG, which have bone repair functions, serve as inorganic matrix materials, while Er 2 O 3 and Yb 2 O 3 act as activators and sensitizers, respectively. MTO is used as a therapeutic drug for treating myeloma. The drug release process of MTO was successfully monitored by upconversion luminescence. Cell experiments confirmed that 7Li-MBGs:2Er/2Yb-0.75MTO has a certain long-term therapeutic effect on multiple myeloma, and its mechanism of action is consistent with its drug release kinetics. Moreover, the synergistic effect of rare earth oxides, alkali metal ions and MTO endows 7Li-MBGs:2Er/2Yb-0.75MTO with high antibacterial and osteoinductive abilities, and thus playing a role in enhancing the drug resistance of infectious bacteria, preventing bacterial infection, repairing bone defects and monitoring the real-time dynamics of drug release during multiple myeloma therapy. Therefore, the 7Li-MBGs:2Er/2Yb-0.75MTO multifunctional drug delivery platform synthesized in this work provides a new idea for the treatment of multiple myeloma and biomonitoring.
研究领域:
生物医学工程
·
肿瘤学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Yinghua Zhuang,Feng Sun,Lijuan Zhou,Changxi Jiang,Jianjun Wang,Shuang Li,Shengjun Liao
Silicon nitride (Si 3 N 4 ) ceramics using four compound sintering aids Er 2 O 3 –MgO, Er 2 O 3 –MgF 3 , Er 2 O 3 –Mg 2 Si, and Er 2 O 3 –Mg 3 N 2 . The effects of binary sintering aid types and temperatures on the microstructure, mechanical properties, and thermal conductivity of Si 3 N 4 ceramics were investigated. The depolymerization effect of fluorine atoms introduced by MgF 2 sintering additives on the silicate melt structure reduced the viscosity of the liquid phase. However, the existence of volatile phase leads to low density of Si 3 N 4 ceramics. While the additional Si and N atoms increase the concentration of solute atoms, which was conducive to sintering densification of Si 3 N 4 ceramics. Although Mg 2 Si and Mg 3 N 2 sintering aids produced higher viscosity liquid phase compared with MgF 2 , denser Si 3 N 4 ceramics were obtained at 1900°C. The Si 3 N 4 ceramics doped with 5 mol% Er 2 O 3 and 2 mol% Mg 3 N 2 at 1900°C showed the excellent properties: including the highest Vickers hardness (16.8 GPa), flexural strength (912 MPa), and fracture toughness (8.1 MPa m 1/2 ), as well as the desirable thermal conductivity (83 W/(m K)).
研究领域:
材料科学
·
陶瓷工程
✓ 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）