Journal of Alloys and Compounds最新文献

{"title":"In-Situ Growing of MIL88A(Fe)@Active Faceted Cu2O Core-Shell Heterostructure for Super Photocatalytic Performance and Catalytic Reduction of Toxic Nitrophenol Compounds","authors":"Amira. H. Abdelhamid, Asmaa. M.A. Omar, Nadia. H. Yahia, M.M. El-Rabiei, Sameh S. Ali, Gomaa Khabiri, Hemdan S.H. Mohamed","doi":"10.1016/j.jallcom.2024.177701","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177701","url":null,"abstract":"Herein, well-constructed 2D active (110) and (111) faceted Cu₂O nanosheets are in-situ grown on the surface of spindle MIL-88A to form a novel porous MIL88A (Fe)@active faceted Cu₂O core-shell heterostructure via a facile solvothermal method. The fabricated heterostructure is optimized to be a promising catalyst for the catalytic reduction of various nitrophenol compounds such as P-nitrophenol and 2,4-dinitrophenols, as well as the removal of methylene blue dye (MB). The optimal M88@Cu₂O-2 heterostructure demonstrated an outstanding catalytic performance for reducing nitrophenols, reaching 96.7% for P-nitrophenol and 96.1% for 2.4-dinitrophenol. It also achieved excellent photocatalytic activity for MB dye, reaching 95% through 30<!-- --> <!-- -->min, compared to 64% and 72% for Cu₂O and MIL-88A, with rate constants (k) reaching 0.1, 0.038, and 0.04<!-- --> <!-- -->min^-1, respectively. The surprising photocatalytic performance of the prepared structure could be attributed to the following aspects: (i) the growth of the active (111) and (110) facets Cu₂O on the surface of MIL-88A, which could provide various surface energies, reactivates, and crystallographic arrangements, all of which impact the photocatalytic efficiency of the designed M88@Cu₂O-2 heterostructure, (ii) the construction of an efficient heterojunction between active faceted Cu₂O and MIL88A, which resists the recombination of e^- and h⁺, improving the migration and separation of charge carriers, and (iii) the core-shell construction could provide more electron transport channels to significantly enhance the suppression of electron-hole pair recombination in the photocatalytic process. Besides that, the M88@Cu₂O-2 core-shell has great photo-electrochemical performance, reaching 17.68 μA/cm² for the photocurrent test and 73<!-- --> <!-- -->mA/cm² for the LSV test when exposed to visible light. Our study will provide a new vision for developing more hierarchical core/shell MOF-based heterostructures with outstanding multifunctional performance for future industrial practice.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"129 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Excellent electrolyte functionality of Sm-doped La2O3 wide band gap semiconductor for low temperature solid oxide fuel cells","authors":"Jie Gao, Dong Zhong, Dan Zheng, Muhammad Akbar, Kun Chen, Cong Jiang, Yuanjing Meng, Baoyuan Wang","doi":"10.1016/j.jallcom.2024.177699","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177699","url":null,"abstract":"Sluggish ionic conductivity of electrolyte material at low operational temperature creates challenges in the commercialization of low-temperature solid oxide fuel cells (LT-SOFCs). It is imperative to develop promising electrolyte along with excellent ionic conductivity to realize the decent output power at low temperature. The present study proposes a wide band gap semiconductor samarium doped lanthanum oxide (SLO), and its electrolyte functionality was evaluated in LT-SOFCs. The SOFC based on SLO electrolyte achieved promising performance of 977<!-- --> <!-- -->mW<!-- --> <!-- -->cm^-2 along with high open circuit voltage of 1.02<!-- --> <!-- -->V at 550 ℃. Sm doping in lanthanum significantly decrease the grain boundary resistance in the SLO electrolyte. Conductivity tests show that SLO possess both proton and oxygen ion conductivities, and which are significantly improved after Sm doping. Furthermore, on performing durability test the cell persistently get stable for 20<!-- --> <!-- -->hours. This work demonstrates the potential of SLO as a high-performance electrolyte for LT-SOFCs.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"23 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anisotropy in fracture toughness and toughening mechanism of Ti-22Al-25Nb alloy related to texture and grain boundary damage","authors":"Penghui Zhang, Weidong Zeng, Fan Zhang, Haoyuan Ma, Jianwei Xu, Xiaobo Liang, Yongqing Zhao","doi":"10.1016/j.jallcom.2024.177703","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177703","url":null,"abstract":"Combining the intrinsic (crack tip plasticity) and extrinsic (crack deflection) toughening mechanism, the anisotropy of fracture toughness for Ti-22Al-25Nb alloy obtain by B2 phase region isothermal forging process is discussed. The results show that the sequence of fracture toughness from high to low is RD (radial direction), OD (45° to RD) and AD (axial direction). Intrinsically, it is found that the damage of lamellar O phase ahead of the crack tip dominates crack propagation. Compared with grain interior, continuous lamellar O phase on grain boundary can more easily promote the nucleation and propagation of crack, reducing the intrinsic resistance of crack propagation. Consequently, AD sample with intergranular fracture has the smallest crack tip plastic zone than RD and OD samples with transgranular fracture. Due to the activation of prism &lt;a&gt; slip for O phase, the texture of RD sample has a higher Schmid factor than that of OD sample, resulting in better crack tip plasticity. Extrinsically, it can be concluded that grain boundaries have a significant effect on crack deflection due to the pancake shaped B2 morphology. For RD sample, the grain boundary is perpendicular to the initial crack plane, so the stress intensity factor (<em>K</em>_<em>I</em>) required for cleavage fracture is less than that for intergranular fracture. The deflection of the cleavage facets results in the highest crack propagation tortuosity. Also, the crack propagation near grain boundary of OD sample leads to significant deflection because the grain boundary is located in the direction of maximum shear stress. Compared with RD and OD samples, the <em>K</em>_<em>I</em> required for intergranular fracture of AD sample is minimum, results in a flat fracture path.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1 6 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of multilevel lamellar microstructure on notch high cycle fatigue properties and crack initiation behavior of Ti-55531 alloy","authors":"Yanyan Zhao, Zhong Zhang, Chaowen Huang, Jiang Yang, Changsheng Tan, Mingpan Wan, Yongqing Zhao","doi":"10.1016/j.jallcom.2024.177684","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177684","url":null,"abstract":"The mechanism of microcrack initiation for notch high cycle fatigue (NHCF) in Ti-55531 alloy with various multilevel lamellar microstructures (MLMs) under the certain notch root radius (<em>R</em>=0.34<!-- --> <!-- -->mm) was thoroughly investigated. Results indicate that the primary microstructure unit controlling fatigue crack initiation is the secondary α (α_s) lamellae. Majority of microvoids and microcracks initiate at the interfaces between α_s and residual β matrix (β_r) nearby the notch root, propagating towards the specimen core along α_s/β_r interfaces or passing through α_s lamellae, forming longer microcracks. Moreover, as the width/length ratio of α_s lamella and α colony (<em>d</em>_<em>α</em> and <em>d</em>_<em>c</em>) increases, the cyclic plastic deformation of α_s lamella and α colony intensify significantly. Consequently, numerous fractures occurred in α_s lamellae, greatly facilitating fatigue microcracks initiation and leading to a severe reduction in both fatigue life and strength of the Ti-55531 alloy. Besides slipping and twinning, a small number of stacking faults (SFs) were also detected in the α_s lamellae at smaller microstrutural size (<em>d</em>_<em>α</em>=0.049 and 0.053, <em>d</em>_<em>c</em>=0.148 and 0.168). Interestingly, the interaction between twins, basal SFs, and dislocation slip could be another significant mechanism that promotes the cracking of α_s/β_r interfaces for NHCF microcrack initiation in this alloy. Furthermore, with an increasing of <em>d</em>_<em>α</em> and <em>d</em>_<em>c</em>, the occurrence of slipping increases, while the occurrences of twins and SFs decrease.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"13 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large-scale free-standing Bi2Te3/Si heterostructures developed by a modified solvothermal method for a self-powered and efficient imaging photodetector","authors":"Song Yang, Shujie Jiao, Yiyin Nie, Yue Zhao, Xiaodi Jia, Shiyong Gao, Dongbo Wang, Jinzhong Wang, Hongwei Liang","doi":"10.1016/j.jallcom.2024.177694","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177694","url":null,"abstract":"Topological insulator bismuth telluride (Bi₂Te₃), an exotic state of quantum matter, has broad application prospects in next-generation optoelectronic devices. However, photoexcited carriers in Bi₂Te₃ usually relax rapidly due to the lack of a large band gap. Herein, high-quality Bi₂Te₃/Si heterojunction is successfully synthesized by a low-cost modified two-step solvothermal method to grow large-scale free-standing Bi₂Te₃ nanosheets on a Si substrate. Benefiting from the promotion of photogenerated carrier separation and transport by the built-in electric field at the Bi₂Te₃/Si heterojunction interface, the Bi₂Te₃/Si heterojunction photodetector exhibits a high responsivity of 16.44<!-- --> <!-- -->mA<!-- --> <!-- -->W^-1, a high specific detectivity of 2.44 × 10¹¹ Jones, and fast rise/recovery times of 11/13 ms under 470<!-- --> <!-- -->nm illumination at zero bias. Additionally, the device has potential applications in high-resolution imaging. In view of its overall photosensitivity performance and low cost, the Bi₂Te₃/Si heterojunction synthesized by the solvothermal method has a promising application in fast broadband photodetectors, and also provide a new route for the growth of Bi₂Te₃ nanosheets on substrates.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"6 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure and mechanical properties of strength-ductility synergetic SiC/ZK60 composites by a pre-dispersion strategy","authors":"Yinghao Feng, Chaoyang Sun, Sinuo Xu, Jingchen Liu, Lingyun Qian","doi":"10.1016/j.jallcom.2024.177702","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177702","url":null,"abstract":"The strength-ductility trade-off presents a significant challenge in the development of magnesium matrix composites (MMCs). A novel strategy that combines powder pre-dispersion, nano-SiC/Al master alloy sintering, stir casting, and hot extrusion combined method was introduced to prepare the strength-ductility synergetic SiC/ZK60 composites. The microstructural evolution and mechanical properties of these composites have been thoroughly investigated and compared. The results demonstrate that SiC particles are uniformly distributed within the as-solution-treated composites, and extrusion processes promote cluster refinement. Microstructural characterization shows that adding nano-SiC/Al enhances grain refinement and facilitates the precipitation of secondary phases. The grain refinement is attributed to the accelerated dynamic recrystallization (DRX) and nano-particle pinning, where particle stimulated nucleation (PSN), continue DRX (CDRX), and discontinue DRX (DDRX) are the dominant DRX mechanisms of composites. This process is further enhanced by increased nucleation sites induced by SiC, which facilitate the precipitation of MgZn₂ and Zr phases. Additionally, a microscale Al₃Zr phase precipitates within the composites due to aluminum addition. Notably, both strength and ductility, as well as elastic modulus (E) of 10SiC/ZK60 and 20SiC/ZK60 composites were improved simultaneously, with optimal ultimate tensile strength and elongation (EL) increasing by nearly 10%. Grain refinement emerges as a primary factor contributing to enhanced mechanical properties. Also, load transfer and stress release caused by multiple crack sources contribute significantly to strength and ductility strengthening, respectively.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"108 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High Pressure Investigation of Structural and Electronic Behavior of β-ZnMoO4","authors":"Siddhi Garg, Ashok K. Verma, H.K. Poswal, T.C.N. Nicacio, D. Errandonea, Nandini Garg","doi":"10.1016/j.jallcom.2024.177515","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177515","url":null,"abstract":"In this study, the wolframite phase of ZnMoO₄ was investigated under compression using x-ray diffraction (XRD), Raman spectroscopy and <em>ab-initio</em> calculations. The enthalpy calculations show that β-ZnMoO₄ is a metastable phase at ambient pressure and becomes the most stable phase above 2<!-- --> <!-- -->GPa. New diffraction peaks were observed in XRD patterns ~ 40<!-- --> <!-- -->GPa, which indicate that it has undergone a phase transition to a lower symmetry phase. These diffraction peaks could be assigned to the (1 1 0), (2 0 -2), (2 2 0) peak of the base-centered monoclinic phase, <em>Cm</em>, determined by <em>ab-initio</em> crystal structure search. We observed a co-existence of the ambient and high pressure phases in the XRD data above 40<!-- --> <!-- -->GPa, which clearly indicates the first order nature of the phase transition. The Raman spectroscopic studies showed an abrupt change in intensities and red shift of the highest intensity peak ~ 39<!-- --> <!-- -->GPa, thus corroborating the x-ray diffraction and ab-initio results. This shift is correlated with a coordination increase from 6 to 9 in Mo⁺⁶ ions associated with this phase transition to <em>Cm</em> phase. This study also shows that β-ZnMoO₄ is an insulator with a direct band gap of 2.9<!-- --> <!-- -->eV at ambient pressure as determined from UV visible absorption spectroscopy making it an ideal material for photocatalytic applications. Our electronic calculations corroborate this finding.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"197 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent Advances in Additive Manufacturing Technologies for Ni-Based Inconel Superalloys – A Comprehensive Review","authors":"Md. Shahwaz, Prekshya Nath, Indrani Sen","doi":"10.1016/j.jallcom.2024.177654","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177654","url":null,"abstract":"<em>Ni-based</em> superalloys exhibit exceptional high-temperature mechanical properties. A specific group, “Inconel superalloys,” has been a focus of extensive research owing to their ability to withstand high-temperatures, making them an inevitable candidate for aerospace applications. Superalloy components are traditionally manufactured through casting, forging, and post-machining, leading to material wastage and higher manufacturing costs. In this regard, additive manufacturing <em>(AM)</em> is increasingly used for fabricating complex shaped Inconel based components for critical aerospace application. <em>AM</em> is particularly advantageous for easy fabrication of intricate designs while having high material utilization, and reduced build time, still achieving controlled and targeted properties for expensive and difficult-to-machine Inconel superalloy components. Nevertheless, the complex layer-by-layer processing technique leads to completely different microstructural evolutions with respect to the as-cast counterparts which is also reflected in altered mechanical performance. This is particularly crucial considering that Inconel consists of different alloying elements, leading to the formation of multiple phases like γ, γ′ γ′′, etc. The current article reports a comprehensive overview of the following two topics: (i) commonly practiced <em>AM</em> techniques for fabricating Inconel superalloys and (ii) processing– microstructure–mechanical properties correlations for the most studied additively manufactured Inconel superalloys, <em>IN718</em>, <em>IN625</em>, <em>IN738LC</em>, and <em>IN939</em>. Special attention is dedicated in elucidating the influence of heat-treatment schedules on both the microstructure and mechanical properties of Inconel superalloys. This extensive research would prove beneficial in optimizing the types and processing parameters for <em>AM</em> of Inconel superalloys to attain the targeted microstructure, and phases, and also to design the suitable post-manufacturing heat-treatment schedule. Such correlation holds significant potential for realizing enhanced mechanical performance for additively manufactured Inconel components for industrial applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"63 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Iron carbonate hydroxide-iron oxide hetero-phase catalyst: A bifunctional electrocatalyst for urea boosted overall water splitting","authors":"Gunasekaran Arunkumar, Lokeshraj Srinivasan, Govindan Deviga, Mariappan Mariappan, Mehboobali Pannipara, Abdullah G. Al-Sehemi, Savarimuthu Philip Anthony","doi":"10.1016/j.jallcom.2024.177676","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177676","url":null,"abstract":"Iron carbonate hydroxide-iron oxide hetero-phase bifunctional electrocatalyst was directly fabricated on nickel foam (NF), which exhibited strong urea oxidation reaction (UOR) and overall water splitting including sea water splitting. Hydrothermal method was adopted for fabrication of iron carbonate hydroxide-iron oxide catalyst (<strong>1-3</strong>) and deposition time was varied (3<!-- --> <!-- -->h (<strong>1</strong>), 6<!-- --> <!-- -->h (<strong>2</strong>) and 12<!-- --> <!-- -->h (<strong>3</strong>)) to optimize the electrocatalytic activity. FTIR and X-ray photoelectron spectroscopic (XPS) analysis suggested the formation of iron carbonate hydroxide-iron oxide. OER studies revealed relatively strong activity for <strong>1</strong> compared to <strong>2</strong> and <strong>3</strong> in alkaline condition. <strong>1</strong> required the overpotential of 238<!-- --> <!-- -->mV for producing the current density of 50<!-- --> <!-- -->mA/cm² whereas <strong>2</strong> and <strong>3</strong> needed 248 and 280<!-- --> <!-- -->mV, respectively. In contrast, <strong>3</strong> showed strong HER activity that required overpotential of 301<!-- --> <!-- -->mV to achieve 50<!-- --> <!-- -->mA/cm² whereas <strong>2</strong> and <strong>1</strong> needed 303 and 343<!-- --> <!-- -->mV, respectively. Hence, <strong>2</strong> was chosen to fabricate overall water splitting and UOR. In presence of urea, <strong>2</strong> required low overpotential (130<!-- --> <!-- -->mV) to produce 50<!-- --> <!-- -->mA/cm² current density. For overall water splitting, <strong>2</strong> needed 1.71<!-- --> <!-- -->V to produce 10<!-- --> <!-- -->mA/cm² current density. The UOR combined cell required only 1.56<!-- --> <!-- -->V to achieve 10<!-- --> <!-- -->mA/cm². Tafel slope, impedance and electrochemical active surface area (ECSA) calculation suggests improved kinetics with reduced charge transfer resistance and more active sites for <strong>2</strong>. The stability studies indicated good stability of <strong>2</strong> in OER, HER and overall water splitting. After catalysis analysis indicated the formation of FeOOH and FeO active species during OER and HER, respectively. Thus, the present work developed a low-cost transition metal based bifunctional electrocatalyst for overall water splitting.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"73 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Active-matrix TFT driven GaN blue Micro-LED display realized with electroplated copper-tin-silver micro bumps-based bonding structure","authors":"Xuehuang Tang, Xiaowei Huang, Taifu Lang, Yujie Xie, Xin Lin, Yang Li, Yijian Zhou, Qun Yan, Kaixin Zhang, Chang Lin, Jie Sun","doi":"10.1016/j.jallcom.2024.177695","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177695","url":null,"abstract":"With the rapid advancement of display and smart lighting technologies, micro-light-emitting diodes (Micro-LEDs) have garnered substantial attention due to their exceptional performance characteristics. However, a significant challenge persists in achieving reliable interconnections between Micro-LED chips and driver backplanes. This article proposes and implements the Double-Layer Photoresist Structure Electroplating (DPSE) technique for fabricating Cu-SnAg metal bumps, thereby facilitating the heterogeneous integration of oxide thin film transistors (TFTs) with GaN-based blue LEDs. The DPSE process was optimized by addressing several critical factors, including the correlation between bump height and electroplating time, the occurrence of cracks in the photoresist surface, and the removal of the conductive layer. Metal bumps were successfully fabricated on TFT backplanes with dimensions of 16.5 μm × 10 μm, an average height of 5.39 μm, and a uniformity of approximately 2.266%. To demonstrate the efficacy of this approach, a 0.495-inch blue active-matrix Micro-LED display was designed and fabricated. This display features a mesa size of 15<!-- --> <!-- -->µm × 30<!-- --> <!-- -->µm, a pixel pitch of 222<!-- --> <!-- -->µm, and a pixel density of 114 pixels per inch (PPI). The resultant blue Micro-LED display exhibits excellent optical characteristics, achieving a brightness of 1625<!-- --> <!-- -->cd/m² (nits). It is anticipated that the methodology and findings presented in this study will contribute significantly to the advancement of Micro-LED display technology in consumer electronics. This research not only represents a significant advancement in the field of Micro-LED display technology, but also paves the way for future innovations in high-resolution, energy-efficient display systems.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"19 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142673342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}