The Lancet Diabetes & Endocrinology最新文献_第8页

Comparative Study of Anodized TNTs and S-TNTs on Ti Plates for Effective Methylene Blue Degradation under UV LED and Direct Sunlight 钛板上的阳极氧化 TNT 和 S-TNT 在紫外线 LED 和直射阳光下有效降解亚甲基蓝的比较研究

IF 44.5 1区医学

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-10 DOI: 10.1016/j.ceramint.2024.10.140

A.S. Arsha, D. Henry Raja, D. Jonas Davidson

{"title":"Comparative Study of Anodized TNTs and S-TNTs on Ti Plates for Effective Methylene Blue Degradation under UV LED and Direct Sunlight","authors":"A.S. Arsha, D. Henry Raja, D. Jonas Davidson","doi":"10.1016/j.ceramint.2024.10.140","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.140","url":null,"abstract":"The key findings of this research are focused on enhancing the degradation of methylene blue dye with titania nanotubes acting as catalysts under benign UV LED and sunlight. By comparing pristine and sulfur-doped titania, the study reveals that the doped-titania with anatase phase demonstrates a superior photocatalytic activity than pristine titania with mixed phases, achieving a remarkable 98% degradation of dye within 120 minutes under direct sunlight with a small amount of hydrogen peroxide. This enhanced performance is attributed to the 10.7 μm longer and well-arranged nanotubes, effective surface area, better bandgap of 2.39 eV, effective anatase phases, and a lower 20 nm crystallite size. The study underscores the importance of anodization and sulfur doping using titanium plates to tailor the properties of the resultant nanotubes. Also, it indicates a cost-effective dye removal method without secondary pollution, offering a practical and optimistic solution to environmental challenges. The effective titania nanotubes for photocatalytic application in environmental remediation were identified through field emission scanning electron microscope, energy dispersive X-ray analysis, X-ray diffraction analysis, and diffuse reflectance analysis, providing valuable insights and inspiring future research and application in this field.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"15 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CeO2/BiYO3 photocatalyst for the degradation of tetracycline under visible light irradiation 在可见光照射下降解四环素的 CeO2/BiYO3 光催化剂

IF 44.5 1区医学

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-10 DOI: 10.1016/j.ceramint.2024.10.126

Tharit Lerdwiriyanupap, Anurak Waehayee, Thitipong Choklap, Jeeranan Prachanat, Hideki Nakajima, Tammanoon Chankhanittha, Teera Butburee, Theeranun Siritanon

{"title":"CeO2/BiYO3 photocatalyst for the degradation of tetracycline under visible light irradiation","authors":"Tharit Lerdwiriyanupap, Anurak Waehayee, Thitipong Choklap, Jeeranan Prachanat, Hideki Nakajima, Tammanoon Chankhanittha, Teera Butburee, Theeranun Siritanon","doi":"10.1016/j.ceramint.2024.10.126","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.126","url":null,"abstract":"Photocatalysis has received extensive attention as a promising method for reducing antibiotic contamination in water. In this study, we prepared and investigated the photodegradation efficiency of the CeO2/BiYO3 system, using tetracycline (TC) as a model pollutant. The composites demonstrated significantly higher photocatalytic activity compared to pure BiYO3 and CeO2, demonstrating their potential as effective photocatalysts. A detailed investigation of the band potentials indicated that the two semiconductors form a type II heterojunction, enhancing charge separation. Furthermore, the presence of the Ce3+/Ce4+ redox couple serves as an electron trap site, improving the photocatalytic performance by reducing electron-hole recombination. The catalyst achieved peak efficiency only during the first cycle. However, a simple annealing process effectively regenerated the catalyst to its original efficiency, suggesting that the CeO2/BiYO3 composite can be reused with minimal loss of activity. Additionally, we examined the distinct photodegradation mechanisms of pure BiYO3 and the CeO2/BiYO3 composite. Our results provide insights into how the formation of heterostructures influences photocatalytic processes. These findings are valuable for the future design and development of related heterostructure photocatalysts, aiming to enhance their efficiency for the degradation of various pollutants.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"9 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of powders calcination temperatures under hydrogen on the microstructures and properties of Gd2O2S:Pr,Ce scintillation ceramics 氢气环境下的粉末煅烧温度对 Gd2O2S:Pr,Ce 闪烁陶瓷微观结构和性能的影响

IF 44.5 1区医学

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-10 DOI: 10.1016/j.ceramint.2024.10.124

Dong Huang, Qiang Liu, Danyang Zhu, Junlin Wu, Chen Hu, Warut Chewpraditkul, Weerapong Chewpraditkul, Jiang Li

{"title":"Influence of powders calcination temperatures under hydrogen on the microstructures and properties of Gd2O2S:Pr,Ce scintillation ceramics","authors":"Dong Huang, Qiang Liu, Danyang Zhu, Junlin Wu, Chen Hu, Warut Chewpraditkul, Weerapong Chewpraditkul, Jiang Li","doi":"10.1016/j.ceramint.2024.10.124","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.124","url":null,"abstract":"The precursor of Gd2O2S:Pr,Ce powders with stacked layered structure was synthesized in hot water bath using oxide powders and concentrated sulfuric acid as raw materials. The powders were synthesized by calcining the precursor under flowing H2 atmosphere at 500-900oC for 3 h. The influence of calcination temperatures under hydrogen atmosphere, which was defined as reduction temperature, on the microstructures and properties of powders was investigated. Using the synthesized powders as initial material, Gd2O2S:Pr,Ce scintillation ceramics with high relative density (over 98% of the theoretical value) were fabricated through vacuum pre-sintering at 1350oC for 3 h followed by HIP post-treatment in an argon atmosphere at 1450oC for 3 h. Intense green emission line at 511 nm due to the 3P0→3H4 transition of Pr3+ was obtained in the X-ray excited luminescence (XEL) spectra of all Gd2O2S:Pr,Ce ceramics. The Gd2O2S:Pr,Ce ceramics fabricated from powders synthesized at 700oC showed the highest optical transmittance, XEL intensity, and light yield (LY) value of 24,660 ph/MeV @ 662 keV γ rays. The photoluminescence decay time of Pr3+ 3P0 → 3H4 transition and scintillation decay time were measured to be ∼3 μs for all Gd2O2S:Pr,Ce ceramics. The effect of reduction temperature on optical transmittance and LY of Gd2O2S:Pr,Ce ceramics was also discussed.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"57 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tunable ferromagnetism via in situ strain engineering in single-crystal freestanding SrTiO3-δ membrane 通过单晶独立 SrTiO3-δ 膜中的原位应变工程实现可调铁磁性

IF 44.5 1区医学

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-10 DOI: 10.1016/j.ceramint.2024.10.098

Yue Han, Jinrui Guo, Huan Liu, Jiaqing Wang, Wenqi Gao, Qinglong Wang, Bin He, Weiming Lü

{"title":"Tunable ferromagnetism via in situ strain engineering in single-crystal freestanding SrTiO3-δ membrane","authors":"Yue Han, Jinrui Guo, Huan Liu, Jiaqing Wang, Wenqi Gao, Qinglong Wang, Bin He, Weiming Lü","doi":"10.1016/j.ceramint.2024.10.098","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.098","url":null,"abstract":"Engineering stoichiometry and lattice field in transition metal oxides (TMOs) is recognized as a promising approach for achieving emergent functional properties and exploring fundamental scientific questions. To overcome the constraints of rigid epitaxial TMOs, this study releases and transfers freestanding SrTiO3-δ (STO3-δ) membranes, derived using a water-dissolution method from STO3-δ/Sr3Al2O6/SrTiO3, onto flexible polyimide. In-plane mechanical strains were then applied to investigate the strain evolution-induced ferromagnetism. Continuous strain modulates interplane and intraplane exchange interactions between neighboring atoms in the ferromagnetic STO3-δ membranes, thereby influencing their ferromagnetic properties. STO3-δ initially undergoes in-plane octahedral distortion when strain is less than 1.5%, followed by a decrease in the out-plane lattice constant. This structural variation leads to complex strain-dependent behaviors in the saturation magnetic moment (Ms) and coercive field (Hc) of STO3-δ, with Ms and Hc exhibiting a nonlinear, volcano-shaped, and step-wise correlation, respectively. Our research demonstrates that freestanding STO3-δ serves as a platform for studying local defects and their impacts on tunable magnetic properties, greatly enhancing our understanding of t2g electron engineering through modulable inter/intra plane exchange coupling with lattice field.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"43 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergizing nanotechnology, codoping, and reinforcement with rGO to increase the catalytic activity of a modified Ho/Cr-FeNdO3-rGO nanocomposite for tartrazine removal 通过纳米技术、共掺杂和增强 rGO 来提高改性 Ho/Cr-FeNdO3-rGO 纳米复合材料去除酒石酸的催化活性

IF 44.5 1区医学

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-10 DOI: 10.1016/j.ceramint.2024.10.109

Basem Al Alwan, Muhammad Aadil, Awais Khalid, Amira Alazmi, Atef El Jery, Mazen R.Alrahili, Mousa M. Hossin, Muhammad Imran Saleem, Mostafa El-Khatib

{"title":"Synergizing nanotechnology, codoping, and reinforcement with rGO to increase the catalytic activity of a modified Ho/Cr-FeNdO3-rGO nanocomposite for tartrazine removal","authors":"Basem Al Alwan, Muhammad Aadil, Awais Khalid, Amira Alazmi, Atef El Jery, Mazen R.Alrahili, Mousa M. Hossin, Muhammad Imran Saleem, Mostafa El-Khatib","doi":"10.1016/j.ceramint.2024.10.109","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.109","url":null,"abstract":"Herein, we used a wet technique to synthesize a novel magnetic retrievable FeNdO3 perovskite semiconductor codoped with Ho/Cr. We created a nanocomposite by placing an rGO sheet under the semiconductor as a support. The structural, thermal, morphological, optoelectronic, electrical, and surface properties of the synthesized FeNdO3 (FNO-1), Ho/Cr-FeNdO3 (FNO-2), and Ho/Cr-FeNdO3/rGO (FNO-3) samples were analysed using XRD, FTIR, TGA, SEM, PL, UV/Vis, I–V, and BET. A structural study confirmed that the FNO-1 and FNO-2 samples grew as orthorhombic phases with grain sizes of 21.61 and 18.2 nm, respectively. The SEM and TGA analyses of FNO-3 indicated the presence of perovskite nanoparticles (NPs) modified with r-GO. The composite sample (FNO-3) effectively harvested light photons and had a good conductance (0.43 mA/V) and photocurrent (42.6 mA) and a large specific surface area (61 m2g-1), demonstrating the positive impact of codoping and rGO reinforcement. Under 70 min of visible light irradiation, the FNO-1, FNO-2, and FNO-3 photocatalysts degraded the azo dye tartrazine with efficiencies of 48.95%, 65.2%, and 98.74%, respectively, indicating the photocatalytic activity of the nanocomposite was considerably higher than those of the codoped and pristine samples. The synthesized nanocomposite mineralized tartrazine with a rate constant of 0.021 minute-1, where superoxide radicals and free electrons were the predominant reactive species. In this study, nanotechnology, codoping, and compositing were integrated to create a modified perovskite material with exceptional photocatalytic performance and high application potential for water treatment.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"229 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of Chromium Substitution on Structural, Spectroscopic, and Dielectric Properties of Ba4Ni2Fe36O60 Ceramics 铬替代对 Ba4Ni2Fe36O60 陶瓷的结构、光谱和介电特性的影响

IF 44.5 1区医学

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-10 DOI: 10.1016/j.ceramint.2024.10.121

Sikandar Hayat, Muhammad Azhar Khan, Raqiqa Tur Rasool, Haya Alhummiany, Ghulam Abbas Ashraf, Muhammad Junaid, Muhammad Arshad, Hisham S.M. Abd-Rabboh, Zahra Bayhan

{"title":"Impact of Chromium Substitution on Structural, Spectroscopic, and Dielectric Properties of Ba4Ni2Fe36O60 Ceramics","authors":"Sikandar Hayat, Muhammad Azhar Khan, Raqiqa Tur Rasool, Haya Alhummiany, Ghulam Abbas Ashraf, Muhammad Junaid, Muhammad Arshad, Hisham S.M. Abd-Rabboh, Zahra Bayhan","doi":"10.1016/j.ceramint.2024.10.121","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.121","url":null,"abstract":"Cr-substituted Ni2U hexaferrite series (Ba4Ni2Fe36-xCrxO60for x = 0.0 to x = 2.0 with a step size of 0.5) was prepared via sol-gel auto-combustion route and annealed at 1200 ˚C for 6hours. The samples were investigated using XRD, FTIR, SEM, XPS, and high frequency (1MHz to 6 GHz) dielectric and microwave absorption measurements (VNA). XRD studies revealed that Cr3+ ions successfully substituted in BaNi2U-type hexaferrite and have a single-phase structure. The average crystallite size decreased while the percentage of porosity increased with the substitution. FTIR spectra confirmed the formation of the hexaferrite phase in all compositions. SEM micrographs revealed that the prepared samples are hexagonal. XPS spectra show the presence of all constituent elements in the samples. The dielectric constant, dielectric loss, and A.C. conductivity of samples was analyzed. Cole-Cole plots with single semicircles of different radii show the grain and grain boundaries affecting the conduction process. Moreover, Cr-substitution enhanced the microwave absorption capability. The hexaferrite sample Ba4Ni2Fe35 Cr1.0O60, with a pellet thickness of 1.81mm, showed the highest M.W. absorption at 1.09 GHz frequency with a reflection loss (R.L.) value of -55 dB. The hexagonal-shaped morphology, high porosity, and enhanced reflection loss value suggest their use in high-frequency microwave applications.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"4 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Crystal Growth of Hydrated Calcium Silicate Synthesized from Fly Ash And Lime Milk at 100°C 粉煤灰和石灰乳在 100°C 下合成的水合硅酸钙的晶体生长

IF 44.5 1区医学

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-10 DOI: 10.1016/j.ceramint.2024.10.130

Zhiming Zhao, Zhijie Yang, dong Kang, Chenyang Fang, yang Jiao, Kaiyue Wang, Wenhao Tang

{"title":"Crystal Growth of Hydrated Calcium Silicate Synthesized from Fly Ash And Lime Milk at 100°C","authors":"Zhiming Zhao, Zhijie Yang, dong Kang, Chenyang Fang, yang Jiao, Kaiyue Wang, Wenhao Tang","doi":"10.1016/j.ceramint.2024.10.130","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.130","url":null,"abstract":"To maximize the high-value application of fly ash, this study investigates the incorporation of amorphous silica derived from fly ash as a silicon source and lime milk as a calcium source into microporous calcium silicate powders through dynamic hydrothermal synthesis at 100°C for a duration of 2 hours or less. The products were collected at various synthesis intervals and analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and thermogravimetric differential scanning calorimetry (TG-DSC). Results indicate that microporous calcium silicate forms through a dynamic reaction that disrupts Si-O bonds, enhancing the mobility of silica-oxygen tetrahedra and generating H2SiO4 2-groups. Ca2+ ions also interact with these bonds, resulting in Q1 and Q2 forms of silica-oxygen tetrahedra. Phase transformation of calcium silicate at various intervals was noted, beginning with 3CaO·2SiO2·3H2O, shifting to 2CaO·3SiO2·2.5H2O, and finally to CaO·2SiO2·2H2O at 90 minutes. Thus, microporous calcium silicate evolves from an amorphous C-S-H gel into a crystalline form, featuring diverse calcium silicate minerals with calcium-silicon ratios and particle sizes between 10 and 20 μm, with sizes increasing until the 80-minute.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"6 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nucleation, Growth Mechanism, and Bifunctional Electrochromic Supercapacitive Properties of NiO Thin Films 氧化镍薄膜的成核、生长机制和双功能电致变色超级电容特性

IF 44.5 1区医学

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-10 DOI: 10.1016/j.ceramint.2024.10.079

Sushant B. Patil, Sachin V. Desarada, Aviraj M. Teli, Sreedevi Vallabhapurapu, Jae Cheol Shin, Shivaji B. Sadale

{"title":"Nucleation, Growth Mechanism, and Bifunctional Electrochromic Supercapacitive Properties of NiO Thin Films","authors":"Sushant B. Patil, Sachin V. Desarada, Aviraj M. Teli, Sreedevi Vallabhapurapu, Jae Cheol Shin, Shivaji B. Sadale","doi":"10.1016/j.ceramint.2024.10.079","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.079","url":null,"abstract":"Bifunctional devices combining display and energy storage capabilities are crucial for next-generation optoelectronic technology. This study investigates the application of nickel oxide (NiO) thin films for bifunctional electrochromic energy storage systems. The amorphous Ni(OH)2 thin films were electrodeposited with a focus on their time-dependent properties. The Scharifker-Hills model revealed a mixed nucleation process during the electrodeposition. The deposited thin films were examined for their physicochemical properties using X-ray diffraction (XRD), micro-Raman spectroscopy, X-ray photoelectron Spectroscopy (XPS), and morphological studies. Rietveld refinement of the XRD pattern confirmed a cubic NiO polycrystalline phase, while XPS identified Ni3+ as the dominant oxidation state. Significant morphological changes were observed with the varying deposition time. The NiO electrode deposited for 120 minutes exhibited optimal characteristics, including the highest areal capacitance of 161.77 mF/cm2, along with excellent cyclic stability of 96.5% even after 2000 CV cycles. The electrochromic study demonstrated optical modulation ranging within 55-82% at 532 nm, with a maximum coloration efficiency of 86.90 cm2/C. This research demonstrates the viability of NiO thin films as bifunctional electrochromic energy storage systems and the advancement of optoelectronic devices that integrate display and energy storage functionalities.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"28 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and Tunable Luminescence Properties of SrY₂O₄:Dy³⁺ Phosphors SrY₂O₄:Dy³⁺ 荧光的合成与可调发光特性

IF 44.5 1区医学

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-10 DOI: 10.1016/j.ceramint.2024.10.081

Yee-Shin Chang, Cheng-Xin You, Tai-Chen Kuo

{"title":"Synthesis and Tunable Luminescence Properties of SrY₂O₄:Dy³⁺ Phosphors","authors":"Yee-Shin Chang, Cheng-Xin You, Tai-Chen Kuo","doi":"10.1016/j.ceramint.2024.10.081","DOIUrl":"https://doi.org/10.1016/j.ceramint.2024.10.081","url":null,"abstract":"In this study, SrY₂O₄:Dy³⁺ phosphors were synthesized using the solid-state reaction method and evaluated after heat treatment at 1300°C for 5 hours. XRD analysis confirmed the orthorhombic structure of SrY₂O₄ with residual Y₂O₃ present. The addition of Dy³⁺ ions caused lattice expansion, impacting grain size and crystallinity. SEM images showed that the phosphor particles had irregular shapes with minimal size variation, although they tended to agglomerate due to high-temperature heat treatment. Optical analysis revealed significant absorption and emission peaks, with a strong excitation band in the 200-306 nm range and prominent sharp peaks in the 306-480 nm range, particularly at a 0.5 mol% doping concentration. Emission spectra indicated the highest intensity at 0.5 mol% Dy³⁺ concentration, with intensity decreasing due to concentration quenching at higher levels. Thermal stability tests showed peak emission intensity at 70°C, with stability maintained up to 190°C before notable thermal quenching. Chromaticity coordinates remained within the warm white region at both temperatures. This study provides detailed insights into the effects of Dy³⁺ doping on the structural, optical, and thermal properties of SrY₂O₄ phosphors. Compared to previous studies on rare-earth-doped SrY₂O₄ phosphors, this work is the first to systematically explore the substitution of Y³⁺ ions with Dy³⁺ ions until full replacement. The study not only confirmed that the highest emission intensity occurs at 0.5 mol% Dy³⁺ concentration, but also demonstrated that Dy³⁺-doped SrY₂O₄ phosphors exhibit excellent thermal stability, with emission stability maintained below 150°C. These findings expand the potential applications of Dy³⁺-doped SrY₂O₄ phosphors, particularly in high-temperature environments and solid-state lighting.","PeriodicalId":48790,"journal":{"name":"The Lancet Diabetes & Endocrinology","volume":"55 1","pages":""},"PeriodicalIF":44.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Yb:YSAG ceramics: an attractive thin-disk laser material alternative to a single crystal? Yb:YSAG 陶瓷：替代单晶体的极具吸引力的薄盘激光材料？

IF 44.5 1区医学

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-10 DOI: 10.1016/j.ceramint.2024.09.381

Vadim Zhmykhov, Denis Guryev, Vladimir S. Tsvetkov, Yurii Pyrkov, Anastasia Shvedchenko, Elena Dobretsova, Sergey Kuznetsov, Marina Nikova, Vitaly Tarala, Vladimir B. Tsvetkov

引用次数: 0