JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Haiying Xin,Liyan Xue,Mengtong Ma,Ke Song,Qiyong Deng,Zhiyi Wang,Minzhong Huang,Fan Yang
To mitigate the urban heat island effect, align with the “double carbon strategy”, and address the issues of coating aging and mildew on building facades, multifunctional ternary entropy-regulatory tungstate ceramic cool pigments (Ce x Ho 0.1 Gd 1.9– x W 2 O 9+ δ ) were prepared by high-temperature solid-phase method in this study. While ensuring the high near-infrared (NIR) solar reflectance, the anti-ultraviolet (UV) aging and antimycotic performance of rare earth given to pigment were evaluated, and its optical properties, microstructure and practical application effects were deeply explored. The results indicate that ternary entropy regulation changes the color of the pigment from white to yellow, significantly reducing the band gap from 3.28 to 1.90–1.87 eV. Specifically, the Ce 0.2 Ho 0.1 Gd 1.7 W 2 O 9+ δ pigment exhibits excellent chromatic properties ( L * = 73.79, a * = 20.21 and C * = 50.51) and a high NIR solar reflectance (96.23%). Infrared thermography confirms that it has a good cooling effect, with temperatures of 3.5 °C lower than the commercially available coating of similar color. Furthermore, the performance of multifunctional integration is that the pigments show enhanced absorption in the UVA (long-wave ultraviolet 320–400 nm) range, with an increase in average light absorption from 0.19 to 0.91 and a substantial increase in antimycotic rate from 42.86% to 97.46%. At the same time, this material has good acid and alkali resistance (Δ E * ≤ 2.41). The successful development of the multifunctional cool pigment materials opens a new way to energy-saving architectural wall coating materials.
研究领域:
材料科学
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建筑节能
·
光学工程
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产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Huixue Yao,Xueer Ning,Hong Zhao,Aize Hao,Muhammad Ismail
In the present research work, gadolinium-doped nickel ferrite (NiFe2–xGdxO4, x = 0–0.1) thin films have been synthesized by a facile sol–gel approach. The structural, optical, and magnetic performances of Gd-doping on nickel ferrite films have been investigated. The X-ray diffraction pattern indicated a cubic spinel ferrite structure and that the lattice parameter increased, while the crystalline size decreased with increasing the Gd concentration. Scanning electron microscopy analysis indicated that Gd-doped thin films were dense and smooth. The optical band gap value of the as-prepared thin films increased with increasing the Gd concentration. It showed that Gd-doping endowed nickel ferrite thin films with much better saturation magnetization (278.53 emu/cc) and remnant magnetization (67.83 emu/cc) at an appropriate 0.05 Gd-doping concentration. In addition, our results also revealed that the saturation magnetization remarkably increased, then sharply decreased with increasing of Gd doping content, which is attributed to effects of Gd-doping, exchange interaction, and redistribution of cations. Moreover, X-ray photoelectron spectroscopy analysis exhibited the effect of Gd-doping substitution on exchange interaction and redistribution of cations at the octahedral site and tetrahedral site.
研究领域:
材料科学
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磁性与磁性材料
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薄膜技术
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纳米材料
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固态化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 9
·2853-2862
·
IF 4
Zurong Liao,Chaojie Li,Jiyou Zhong,Yang Li,Weiren Zhao
A broadband near-infrared (NIR) light source based on a phosphor-converted light-emitting diode (pc-LED) has attracted increasing interest to be used in non-destructive examination, security-monitoring and medical diagnosis fields, which stimulates the exploration of NIR phosphors with high performance. Herein, a series of Cr3+-activated garnet Ln3ScInGa3O12:Cr3+ (Ln = La, Gd, Y, and Lu) phosphors were reported, allowing an emission peak ranging from 726 to 822 nm. Among them, Y3ScInGa3O12:Cr3+ with an optimized Cr3+-doping concentration of 6 mol% exhibits a high internal quantum efficiency (IQE = 83.1%) and excellent absorption efficiency (AE = 44.2%) under 450 nm blue light excitation, enabling an external quantum efficiency as high as 36.7%. Moreover, this material can maintain 93.0% of the initial intensity when heated up to 423 K, implying outstanding thermal stability. Finally, a prototype NIR pc-LED device was fabricated by coating the optimized phosphor on a 455 nm LED chip, which generates a broadband NIR emission with a peak located at 765 nm and a full width at half maximum of 127 nm. The NIR output power and NIR photoelectric conversion efficiency of this device were found to be 38.01 mW and 11.0%, respectively, under 100 mA driving current, demonstrating the feasibility of this material to be applied in NIR pc-LEDs.
研究领域:
材料科学
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光电技术
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光子学
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Yun Lv,Yanhong Wang,Yaling Dou,Ang Li,Jinkui Tang,Olga S. Volkova,Alexander N. Vasiliev,Hongcheng Lu
We report the synthesis and magnetic properties of three rare-earth magnetic compounds RE2O2CN2 (RE = Nd, Dy, Gd) with a frustrated triangular spin–lattice, as well as their thermal stability and Fourier transform infrared (FTIR) spectroscopy. The magnetic susceptibility results show paramagnetic behavior with no long-range order (LRO) down to 2 K in Nd2O2CN2 and Dy2O2CN2 due to spin frustration, which are further confirmed by the specific heat measurements, despite the large Curie–Weiss temperature for strong intralayer interaction through the RE–O–RE pathway (RE = Nd, Dy). While Gd2O2CN2 with a large spin exhibits LRO at 2.7 K, which should be caused by the non-negligible interlayer interactions. The field-dependent magnetization curves show a linear increase up to 7 T for Nd2O2CN2 and Gd2O2CN2, which are far from their saturation. While the magnetization of Dy2O2CN2 increases linearly below 3 T, then slowly increases to saturation, and the magnetization value is 6.62 μB at 7 T. Our work provides promising magnetic triangular lattice systems to further investigate frustration and quantum magnetism in rare-earth magnetic systems.
研究领域:
凝聚态物理
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材料化学
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磁性与磁性材料
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量子材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lixin Cheng,Dongmiao Sang,Fangyu Zhao,Lili Yang,Zhilin Guo,Xinfeng Zhang,Qiaoqiao Yang,Wenju Qiao,Xiaohong Sun,Xiaohong Guan,Haoyu Wang,Jiannan Wang,Hongyan Zou,Xiu'e Li,Fang Fang,Yang Li,Shujun Zhang,Lina Wu,Huiming Lin,Xilin Sun,Kai Wang
Developing new nanoplatforms for dynamically and quantitatively visualizing drug accumulation and targeting within tumors is crucial for precision cancer theranostic. However, achieving efficient tumor therapy via synergistic photothermal/photodynamic therapy (PTT/PDT) using a single excitation light source, remains a challenge. In this work, we designed Gd-surface functionalized copper sulfide nanoparticles that were modified with folic acid (FA) (Cu 1.96 [email protected] ) to overcome the above limitations and promote PTT/PDT therapeutics. Here, Cu 1.96 S-Gd nanoparticles were synthesized via a coprecipitation method. All samples exhibited high longitudinal relaxivity (up to 12.9 mM −1 s −1 ) and strong photothermal conversion efficiency (50.6%). Furthermore, the Gd ions promoted electron-hole segregation, inducing the Cu 1.96 S-Gd nanoparticles to generate more reactive oxygen species (ROS) than pure Cu 1.96 S nanoparticles. The Cu 1.96 [email protected] enabled the targeting of folate receptor (FR) and promoted cellular uptake, consequently enhancing oncotherapy efficacy. Compared to non-targeted Cu 1.96 S-Gd, a higher signal enhancement for magnetic resonance (MR) imaging in vivo by Cu 1.96 [email protected] was recorded. Given photothermal ability, the nanoparticles also could be visualized in infrared (IR) imaging. Furthermore, the nanoparticles exhibited biodegradation behavior and achieved good drug elimination performance via renal clearance. Our strategy, integrating Cu 1.96 [email protected] nanoparticles, MR/IR dual-modal imaging, and PTT/PDT into one nanoplatform, demonstrated great potential for anti-breast cancer therapy by effectively targeting FR overexpressed breast cancer cells.
研究领域:
纳米技术
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生物医学工程
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癌症研究
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诊疗学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Zhihua Gao,Fengyan Fu,Zhaozhi Zhang,Lili Niu,Min Jin,Jian Zhang,Zekun Zhao
Support materials are indispensable to promote the durability of iron oxides for chemical looping applications. However, the dilution effect of supports on the active phase would lead to decreased bulk oxygen conduction, thus leading to compromised activity. Here, we propose several Gd 3+ , La 3+ and Nd 3+ doped CeO 2 as active supports for iron oxides and investigate the support effect to improve hydrogen generation via chemical looping water gas shift . The characterizations show that the dopants improve the oxygen vacancy concentration in the CeO 2 lattice and Fe 2 O 3 /Ce 0.8 Gd 0.1 La 0.1 O 2-δ exhibits the most oxygen vacancy concentration among all the oxygen carriers. Pulse reactions of oxygen carriers show that an abundance of oxygen vacancy concentration can promote the lattice oxygen transfer in bulk, thus contributing to improved redox reactions . The high oxygen conductivity mitigates the dilution effect on the active phase. Therefore, Fe 2 O 3 /Ce 0.8 Gd 0.1 La 0.1 O 2-δ shows the highest hydrogen yield (∼9.49 mmol −1 .g −1 ) and hydrogen generation rate (∼0.632 mmol.g −1 .min −1 ) with only a slight decrease at 650 °C over 100 cycles. Overall, this work highlights the influence of support properties on the redox reactivity of iron oxides for chemical looping applications.
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
Journal of Materiomics
·
2023
·
IF 9.4
Fangze Chen,Dacheng Zhou,Xueqing Xiong,Juntao Pan,Donglin Cai,Ze Wei,Xiyong Chen,Yihui Liu,Nengneng Luo,Jialin Yan,Toyohisa Fujita
A series of single-phase double perovskite Pr 1- x Gd x BaCo 2- y Fe y O 5+ δ ( x = 0, 0.5 and 1, 0 ≤ y ≤ 1) materials were engineered through A/B site co-doping strategy to improve the mechanical, electrical and electrochemical properties as potential cathode materials for the application of intermediate solid oxide fuel cells (IT-SOFCs). The corresponding thermochemical stability, thermal expansion behavior, electrical conductivity and cathodic polarization resistance of the materials were systematically investigated. It was found that the A-site dual lanthanide doped Pr 0.5 Gd 0.5 BaCo 2 O 5+ δ (PGBCO) exhibits improved electrical conductivity, reduced thermal expansion, and comparatively low electrochemical polarization resistance versus single lanthanide double perovskite, PrBaCo 2 O 5+ δ (PBCO) and GdBaCo 2 O 5+ δ (GBCO) materials. Further investigation on the effect of B-site Fe-doping on Pr 0.5 Gd 0.5 BaCo 2- y Fe y O 5+ δ (PGBCF- y , 0 ≤ y ≤ 1) reveals that all the PGBCF- y compositions exhibit excellent chemical stability with Gd-doped ceria (GDC) at operating temperatures not higher than 1 100 °C. Besides, doping of Fe in B-site can effectively reduce the thermal expansion coefficients (TECs) of the Pr 0.5 Gd 0.5 BaCo 2 O 5+ δ ceramics at 30–1 000 °C. And the electrochemical impedance spectra (EIS) results show that the PGBCF- y |GDC| PGBCF- y symmetric cells have acceptable low area specific polarization resistances. Further examination of the cathodic polarization and characteristic capacitance from the AC impedance spectra by employing the relaxation time distribution (DRT) method demonstrated that charge transfer is the dominating sub-process for the oxygen transport through the materials.
研究领域:
材料科学
·
燃料电池研究
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 21
·6917
·
IF 3.4
Qi Luo,Jian Yu,Xueshuang Deng,Ming Cao,Shifang Ma,Qiongxin Hua,Dan Xue,Fenghui An
In this study, we aim to minimize light loss and achieve high power conversion efficiencies (PCE) in perovskite solar cells (PSCs) by employing a spectral conversion film component with antireflection properties. In our scheme, NaYF4:Tm, Yb, and Gd luminescent nanorod/silica nanosphere-based thin films are applied on CH3NH3PbI3PSCs to improve the device efficiency. The film was fabricated by spin coating an aged silica sol containing NaYF4:Tm, Yb, and Gd luminescent nanorods. The size and the spectral conversion properties of the NaYF4:Tm, Yb, and Gd luminescent nanorods were controlled by tuning the Gd3+ion concentration. The microstructure and the transmittance properties of the thin film were controlled by changing the concentration of NaYF4:Tm, Yb, and Gd luminescent nanorod in silica sol. The thin films have excellent spectral conversion properties while exhibiting a maximum transmittance. The photovoltaic performance of PSCs with NaYF4:Tm, Yb, and Gd luminescent nanorod/silica nanosphere-based thin films was systematically investigated. The light transmittance was optimized to 95.1% on a cleaned glass substrate, which resulted in an average increase of about 3.0% across the broadband range of 400–800 nm. The optimized films widen the spectrum of light absorbed by conventional PSC cells and reduce reflections across a broad range, enhancing the photovoltaic performance of PSCs. As a result, the PCE of the PSC increased from 14.51% for the reference device without a thin film to 15.67% for the PSC device with an optimized thin film. This study presents a comprehensive solution to the problem of Fresnel reflection and spectral response mismatch of the PSCs, which provides new ideas for the light management of PSCs.Keywords:perovskite solar cells;spectral conversion;NaYF4;antireflection coating;SiO2
研究领域:
材料科学
·
能源技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Li Guomeng,Zheng Xudong,Xu Tongtong,Zhang Xi,Ji Biao,Xu Zihuai,Bao Sifan,Mei Jinfeng,Li Zhongyu
Research on recycling of used rare earth elements has been of great interest. Adsorption is one of the advantageous methods to recover gadolinium with high value. In the process of adsorption and separation of gadolinium from materials, the selectivity of materials for gadolinium can be significantly improved by using ion imprinting technique. However, gadolinium elution process is a traditional pickling process, which may affect the construction of imprinting sites. In this study, bacterial cellulose with three-dimensional spatial structure was used as the base material of aerogel material, and functional materials containing a large number of carboxyl groups were introduced by chemical grafting method. In combination with ion imprinting technology and N-polyacrylamide as intelligent temperature control valve, intelligent imprinting aerogel (PNBC-IIPS) with specific selectivity to gadolinium was prepared. The properties of aerogel materials were analyzed by SEM, FT-IR, and BET characterization. The experimental analysis shows that the desorption of gadolinium can be achieved by controlling the temperature change. The adsorption experiments show that PNBC-IIPS can selectively adsorb gadolinium ions from aqueous solution. The maximum adsorption capacity reached 95.51 mg g −1 . Compared with unimprinted aerogel, the maximum adsorption capacity of gadolinium ion is significantly increased, which proves that the introduced ion imprinting technique plays a key role in the adsorption process. Cyclic experiments show that the adsorption capacity of PNBC-IIPS can still maintain 88% of the original adsorption capacity after 5 times of adsorption and desorption. In conclusion, PNBC-IIPS is a green adsorbent for selective recovery of gadolinium ions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICS LETTERS
·
2024
·Vol. 49
·期 18
·5224-5227
·
IF 3.1
Xuejiao Wang,Tianzhi Jiang,Lishuo Huang,Renguang Ye,Juan Wang,Youjie Hua,Jingtao Zhao,Gongxun Bai,Shilong Zhao,Junjie Zhang,Shiqing Xu
It is crucial to explore the intrinsic mechanisms that influence thermometric sensitivity. This study investigates the optical performance of materials with the same crystal structure but different phonon energies. Ln2O2S:Er3+/Yb3+ (Ln = La/Gd/Y) phosphors with similar morphology and particle sizes were prepared to systematically study the influence of different phonon energy matrices on optical properties. The intrinsic mechanism was elucidated through the matching degree between the energy gap and phonon energy, Judd–Ofelt (J–O) theory, and quantum dielectric theory. It was ultimately concluded that the combination of high phonon energy with a large Ω2 and a small Ω6 is beneficial for enhancing the sensitivity of temperature sensing materials.
研究领域:
材料科学
·
光学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lei Fu,Di Wu,Yanfei Xiao,Wanfang Zou,Jinfen Kuang,Yan Liang,Fu Du,Jiaqing Peng,Xinyu Ye
Blue phosphor Sr 5−x-y R y (PO 4 ) 3 Cl:xEu 2+ (R = La, Gd, Lu) was prepared via solid-state reaction process, in which R 3+ replaces part of Sr 2+ ions in the matrix to benefit Eu 2+ luminescence. The change of Eu 2+ /Eu 3+ values were studied by XPS , and the results shown that the incorporation of R 3+ in the matrix resulted in the values increase of Eu 2+ /Eu 3+ . And substitute R 3+ non-equivalently for Sr 2+ , the modified Sr 5−x-y R y (PO 4 ) 3 Cl:xEu 2+ phosphors show better luminescence intensity and thermal stability. The emission intensity of Sr 4.72 Lu 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ is 1.97 times of Sr 4.95 (PO 4 ) 3 Cl:0.05Eu 2+ . Moreover, the thermal quenching of Eu 2+ photoluminescence could be reduced. Compared to the commercial BAM:Eu 2+ phosphor, the stabilities of all Sr 4.72 R 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ (R=La 3+ , Gd 3+ and Lu 3+ ) phosphors are better than that of BAM:Eu 2+ at the temperatures below 100 °C. The luminescent intensity of Sr 4.72 Lu 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ maintains 95% while BAM:Eu 2+ is only 88% of the initial intensity at 150 °C. By combining Sr 4.72 Lu 0.2 (PO 4 ) 3 Cl:0.08Eu 2+ , Y 3 (Al,Ga) 5 O 12 :Ce 3+ and CaAlSiN 3 :Eu 2+ with 400 nm near-ultraviolet LED chip, a white-light-emitting diode was obtained. The fabricated WLED device with CIE color coordinates x = 0.3896, y = 0.3788, low CCT (3775 K) and high Ra (95.1), has enormous potential application in full-spectrum lighting field.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Kai Ding,Wenye Deng,Jinyang Li,Ni Ai,Yan Xue,Xianghui Chen,Pengjun Zhao,Weiwei Meng,Aimin Chang,Yongxin Xie
This study synthesized La0.9X0.1AlO3 (X = Eu, Gd, Ho, Tm) and LaAlO3 ceramics by a solid-state method. The characterization of the ceramics revealed that the high degree of lattice distortion induced by variations in the size, mass, and electronegativity of rare-earth elements enhances high-temperature stability, leading to aging drift rates between 0.4% and 2.3% after 500 h at 1000 °C. Furthermore, the emergence of intrinsic defects and dislocations alters the charge conduction mode in LaAlO3, resulting in significant linearity at temperatures above 1000 K. This study further elucidates the transition in the charge conduction mechanism from thermally activated conduction to hopping conduction, which is driven primarily by oxygen vacancies and dislocations. DFT calculations support these findings, demonstrating a reduction in the band gap and increased carrier concentration. This work paves the way for the development of advanced NTC thermistors for reliable temperature monitoring in challenging environments.
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
危险品化学品经营许可证（带存储）