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Stable and high color purity light-emitting diodes of free-standing perovskite single crystal film
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-04 DOI: 10.1016/j.matlet.2025.138274
Wei Zhang , Yifei Wang , Hengyang Xiang , Yongshu Wang , Fan Wu , Zhongchao Bai , Qiang Zhang , Yuan Chen
{"title":"Stable and high color purity light-emitting diodes of free-standing perovskite single crystal film","authors":"Wei Zhang ,&nbsp;Yifei Wang ,&nbsp;Hengyang Xiang ,&nbsp;Yongshu Wang ,&nbsp;Fan Wu ,&nbsp;Zhongchao Bai ,&nbsp;Qiang Zhang ,&nbsp;Yuan Chen","doi":"10.1016/j.matlet.2025.138274","DOIUrl":"10.1016/j.matlet.2025.138274","url":null,"abstract":"<div><div>An antisolvent engineering strategy was proposed to prevent the solvent corrosion phenomenon, the specific type and ratio of antisolvents was demonstrated could effectively decrease the surface defect density. Consequently, the CsPbBr<sub>3</sub> perovskite single crystal films (PSCF) present well optical and electrical properties. Accordingly, the light emitting diode based on bared PSCF that without only surface passivation and interface modification achieved high performance. Over 10,000 brightness and external quantum efficiency about 1.3 % were achieved. Moreover, the electroluminescence peak located at 521 nm showed a narrow half peak width of 18 nm, which well meets the display requirements of NTSC. The device also presents good stability, the T<sub>50</sub> has reached 2 and 37 h at the brightness of 1000 cd/cm<sup>2</sup> and 100 cd/cm<sup>2</sup>, respectively.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"389 ","pages":"Article 138274"},"PeriodicalIF":2.7,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prediction of intrinsic ferrovalley characteristic in MoGeSi2Se6 monolayer
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-04 DOI: 10.1016/j.matlet.2025.138337
Jianping Zhang, Shengshi Li, Weixiao Ji, Miaojuan Ren, Qiang Cao
{"title":"Prediction of intrinsic ferrovalley characteristic in MoGeSi2Se6 monolayer","authors":"Jianping Zhang,&nbsp;Shengshi Li,&nbsp;Weixiao Ji,&nbsp;Miaojuan Ren,&nbsp;Qiang Cao","doi":"10.1016/j.matlet.2025.138337","DOIUrl":"10.1016/j.matlet.2025.138337","url":null,"abstract":"<div><div>Two-dimensional (2D) ferrovalley materials, which exhibit spontaneous valley polarization, have emerged as promising candidates for designing valleytronic devices. From an application perspective, the ferrovalley material that possesses perpendicular magnetic anisotropy and sizable valley polarization is highly desirable. Based on first-principles calculations, we propose that the 2D MoGeSi<sub>2</sub>Se<sub>6</sub> monolayer harbors the desired ferrovalley property. This ferromagnetic monolayer is thermodynamically stable and demonstrates an out-of-plane easy magnetization axis. When the spin–orbit coupling is incorporated, a valley polarization of up to 76.44 meV is spontaneously generated in the conduction band. With its valley-contrasting Berry curvature, the MoGeSi<sub>2</sub>Se<sub>6</sub> monolayer can produce the anomalous valley Hall effect (AVHE) under an in-plane electric field. Furthermore, the applications of biaxial strain and vertical electric field allow for effective manipulations of magnetic anisotropy energy and valley polarization. The excellent magnetic and electronic properties make the MoGeSi<sub>2</sub>Se<sub>6</sub> monolayer an appealing candidate for future experimental investigations and practical applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"389 ","pages":"Article 138337"},"PeriodicalIF":2.7,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
In-situ synthesis of multi-element cemented carbides using the “trinity” method 利用 "三位一体 "法原位合成多元素硬质合金
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-04 DOI: 10.1016/j.matlet.2025.138340
Li Yang , Yanju Qian , Shenying Lu , Bingyun Mu , Zhiwei Zhao
{"title":"In-situ synthesis of multi-element cemented carbides using the “trinity” method","authors":"Li Yang ,&nbsp;Yanju Qian ,&nbsp;Shenying Lu ,&nbsp;Bingyun Mu ,&nbsp;Zhiwei Zhao","doi":"10.1016/j.matlet.2025.138340","DOIUrl":"10.1016/j.matlet.2025.138340","url":null,"abstract":"<div><div>Ultrafine/nano cemented carbdes have broad application prospects due to their excellent properties such as high strength and high hardness. However, there are many challenges in obtaining alloys with high hardness, strength and toughness. Multi-element alloys were prepared by a “trinity” technology using spark plasma sintering (SPS) in-situ synthesis with nano WO<sub>3</sub>, Co<sub>3</sub>O<sub>4</sub>, Cr<sub>2</sub>O<sub>3</sub>, V<sub>2</sub>O<sub>5</sub>, nano-carbon black as raw materials and multi-walled carbon nanotubes (MWCNTs) as reinforcing materials. The results indicate that specimens prepared at 1340 °C, 30 min and 50 MPa have more uniform microstructure and higher mechanical properties. The Vickers hardness and fracture toughness of the sample are 23.50 GPa and 13.15 MPa•m<sup>1/2</sup>, respectively. During the in-situ preparation process of SPS, oxides are transformed into carbides and elemental Co while achieving densification.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"389 ","pages":"Article 138340"},"PeriodicalIF":2.7,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143561841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High cross-linked carbon Nanotube/Polycarbosilane precursor for deriving SiC ceramics with improved thermal diffusion and mechanical properties
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-04 DOI: 10.1016/j.matlet.2025.138339
Songhe Zhang, Cheng Han, Tao Liu, Yingde Wang
{"title":"High cross-linked carbon Nanotube/Polycarbosilane precursor for deriving SiC ceramics with improved thermal diffusion and mechanical properties","authors":"Songhe Zhang,&nbsp;Cheng Han,&nbsp;Tao Liu,&nbsp;Yingde Wang","doi":"10.1016/j.matlet.2025.138339","DOIUrl":"10.1016/j.matlet.2025.138339","url":null,"abstract":"<div><div>Based on a multi-walled carbon nanotube/polycarbosilane (MWCNT/PCS) hybrid precursor with a highly cross-linked structure, MWCNT/silicon carbide (SiC) ceramic monoliths were prepared via hot-press sintering at 1900 ℃ and 30 MPa. Owing to the precursor structure, with its high cross-linking density and chemically bonded MWCNT, the relative and absolute densities of the SiC ceramics were enhanced. We also examined the composition, microstructure, mechanical performance, and thermal properties of the monoliths. The results indicated that the introduction of 1 wt% MWCNTs to the precursor increased the Vickers hardness by 58 %, fracture toughness by 70.8 %, and thermal diffusivity coefficient by 55.5 %. A higher density of MWCNT/SiC ceramic monoliths was crucial for improving the mechanical performance and influencing the thermal diffusivity coefficient. This study provides a new approach for improving the fracture toughness and strength of SiC ceramics and expands the application prospects of composite ceramics under thermal conditions.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"389 ","pages":"Article 138339"},"PeriodicalIF":2.7,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Assessing the ozone-sensing capabilities of porous ZnO nanostructures fabricated via microwave-assisted hydrothermal synthesis
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-03 DOI: 10.1016/j.matlet.2025.138332
Amanda A. Komorizono, Julia C. Tagliaferro, Valmor R. Mastelaro
{"title":"Assessing the ozone-sensing capabilities of porous ZnO nanostructures fabricated via microwave-assisted hydrothermal synthesis","authors":"Amanda A. Komorizono,&nbsp;Julia C. Tagliaferro,&nbsp;Valmor R. Mastelaro","doi":"10.1016/j.matlet.2025.138332","DOIUrl":"10.1016/j.matlet.2025.138332","url":null,"abstract":"<div><div>Porous ZnO nanostructures were synthesized using a microwave-assisted hydrothermal method, followed by calcination to induce pore formation by removing the urea used during synthesis. After microwave synthesis, field-emission scanning electron microscopy (FESEM) images confirmed the formation of ZnO flowers and plates, with pores generated in the flower petals and plates following calcination. The porous ZnO sensor demonstrated the ability to detect low concentrations of O<sub>3</sub> and exhibited relatively low response and recovery times. Additionally, the porous ZnO sensor was exposed to four gases (O<sub>3</sub>, NO<sub>2</sub>, NH<sub>3</sub>, and CO), showing a high selectivity for O<sub>3</sub>.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"388 ","pages":"Article 138332"},"PeriodicalIF":2.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Roles of austenite twin and ferrite in bainite transformation of 42CrMo steel
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-03 DOI: 10.1016/j.matlet.2025.138333
Jianjun Qi , Zhixin Zhang , Guanwen Dai , Xianming Zhao , Zhenhua Wang
{"title":"Roles of austenite twin and ferrite in bainite transformation of 42CrMo steel","authors":"Jianjun Qi ,&nbsp;Zhixin Zhang ,&nbsp;Guanwen Dai ,&nbsp;Xianming Zhao ,&nbsp;Zhenhua Wang","doi":"10.1016/j.matlet.2025.138333","DOIUrl":"10.1016/j.matlet.2025.138333","url":null,"abstract":"<div><div>Steel often contains a bainite microstructure or a multiphase microstructure containing bainite, but bainite transformation is a complex process influenced by multiple factors. In this study, the roles of austenite twin and ferrite in the bainite transformation are investigated by electron backscatter diffraction, using 42CrMo steel as the model material. The bainite that forms on an austenite twin boundary is found to have up to three orientations. Bainite predominantly grows within the twin owing to the constraint of the twin boundaries. Bainite can nucleate adjacent to pre-existing ferrite with several degrees of misorientation; in the transition region between phases, the average increasing rate of misorientation is ∼ 2.6°/μm.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"388 ","pages":"Article 138333"},"PeriodicalIF":2.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the spallation behavior of FeCoCrNiCu high-entropy alloy under laser shock peening at cryogenic temperature
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-03 DOI: 10.1016/j.matlet.2025.138335
W.N. Lu , J. Li , L. Liu , Y.J. Ye , H.J. Pan , Z. Zhang , A.X. Feng
{"title":"Study on the spallation behavior of FeCoCrNiCu high-entropy alloy under laser shock peening at cryogenic temperature","authors":"W.N. Lu ,&nbsp;J. Li ,&nbsp;L. Liu ,&nbsp;Y.J. Ye ,&nbsp;H.J. Pan ,&nbsp;Z. Zhang ,&nbsp;A.X. Feng","doi":"10.1016/j.matlet.2025.138335","DOIUrl":"10.1016/j.matlet.2025.138335","url":null,"abstract":"<div><div>The primary aim was to study the effect of laser shock peening at cryogenic temperature on spallation of FeCoCrNiCu high-entropy alloy. The spallation behavior at different shock velocities and temperatures was investigated by molecular dynamics simulation. The results indicated that the increase in shock velocity intensified the spallation phenomenon. Meanwhile, during laser shock peening process, the coupling effect of volume shrinkage and the inhibition of high-temperature softening effect generated by cryogenic temperature suppressed spallation occurrence, ultimately improving the spallation strength.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"388 ","pages":"Article 138335"},"PeriodicalIF":2.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Versatile fabrication of SERS-active substrates with copper nanowires synthesized via hydrothermal method
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-03 DOI: 10.1016/j.matlet.2025.138338
Konstantin S. Pilyushenko, Andrey G. Musaev, Polina S. Mikhailova, Mikhail A. Atlanov, Olesya V. Vershinina, Maksim A. Popov, Dmitry N. Pevtsov, Pavel V. Arsenov
{"title":"Versatile fabrication of SERS-active substrates with copper nanowires synthesized via hydrothermal method","authors":"Konstantin S. Pilyushenko,&nbsp;Andrey G. Musaev,&nbsp;Polina S. Mikhailova,&nbsp;Mikhail A. Atlanov,&nbsp;Olesya V. Vershinina,&nbsp;Maksim A. Popov,&nbsp;Dmitry N. Pevtsov,&nbsp;Pavel V. Arsenov","doi":"10.1016/j.matlet.2025.138338","DOIUrl":"10.1016/j.matlet.2025.138338","url":null,"abstract":"<div><div>A convenient approach for hydrothermal synthesis of copper nanowires and their subsequent application in surface-enhanced Raman spectroscopy is presented. The highest enhancement of the Raman spectra of the methylene blue and 1,2-bis(4-pyridyl)ethylene analytes was recorded for thicker nanowires with an average diameter of 72 nm, whereas thinner nanowires, averaging 40 <!--> <!-->nm in diameter, exhibited reduced enhancement. The observed variation in signal intensity ranged from 5 to 10 times across different concentrations of the analytes. The obtained enhancement factors are 2.5 × 10<sup>4</sup> and 1.1 × 10<sup>4</sup> for methylene blue and 1,2-bis(4-pyridyl)ethylene, respectively. These findings underscore the potential of copper nanowires in enhancing the detection capabilities of SERS-based analytical techniques.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"388 ","pages":"Article 138338"},"PeriodicalIF":2.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Li-ion conductivity in LiCl: A computational study on the role of defects
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-03 DOI: 10.1016/j.matlet.2025.138336
Yongseon Kim
{"title":"Li-ion conductivity in LiCl: A computational study on the role of defects","authors":"Yongseon Kim","doi":"10.1016/j.matlet.2025.138336","DOIUrl":"10.1016/j.matlet.2025.138336","url":null,"abstract":"<div><div>As chloride-based electrolytes gain attention as key materials for next-generation all-solid-state secondary batteries, understanding the Li-ion conductivity of LiCl, a primary component of the solid-electrolyte interphase layer formed by these electrolytes, is essential. This study investigates the Li-ion transport properties in LiCl crystals through computational simulations, benchmarked against experimentally reported values. The effects of vacancies and grain boundaries on Li-ion conductivity are systematically analyzed across various temperatures. Grain boundaries are identified as dominant pathways for Li-ion migration below 500 K. Above 600 K, however, grain merging eliminates grain boundaries, and Li-ion transport transitions to mechanisms driven by intrinsic properties and vacancy-assisted migration.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"389 ","pages":"Article 138336"},"PeriodicalIF":2.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An experimental and theoretical investigation of room temperature hydrogen storage in TiVNiNb high-entropy alloy
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-03-03 DOI: 10.1016/j.matlet.2025.138334
Punit Kumar , Vivek Kumar Singh , Shailesh Kumar Singh
{"title":"An experimental and theoretical investigation of room temperature hydrogen storage in TiVNiNb high-entropy alloy","authors":"Punit Kumar ,&nbsp;Vivek Kumar Singh ,&nbsp;Shailesh Kumar Singh","doi":"10.1016/j.matlet.2025.138334","DOIUrl":"10.1016/j.matlet.2025.138334","url":null,"abstract":"<div><div>Despite extensive studies, the mechanisms of hydrogen absorption in high-entropy alloys (HEAs) remain complex. In this study, we investigate the room-temperature hydrogen storage performance of an equiatomic TiVNiNb HEA using both experimental techniques and density functional theory (DFT) simulations. Our findings reveal that the TiVNiNb alloy achieves a hydrogen storage capacity of 0.50 wt% at room temperature, closely matching the 0.53 wt% capacity predicted by DFT calculations. This combination of rapid absorption kinetics, thermodynamic stability, and moderate capacity demonstrates the alloy’s potential as a candidate for room-temperature hydrogen storage applications, advancing the understanding of hydrogen-metal interactions in HEAs and offering insights into developing next-generation hydrogen storage materials.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"388 ","pages":"Article 138334"},"PeriodicalIF":2.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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