Journal of Alloys and Compounds最新文献

{"title":"Thermoluminescence Study of Nd3+ Doped Lanthanum Tri-Borate Phosphor","authors":"M. Oglakci, S. Akça-Özalp, Z.G. Portakal-Uçar, V. Correcher, J.F. Benavente, M. Sonsuz, N. Can, Y.Z. Halefoglu, M. Topaksu","doi":"10.1016/j.jallcom.2025.178570","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.178570","url":null,"abstract":"This study investigates the thermoluminescence (TL) properties and trapping parameters of Nd³⁺ doped lanthanum tri-borate (LaB₃O₆) phosphors, synthesized through a low-temperature combustion method. The synthesized samples, doped with varying concentrations of Nd³⁺ (0.25%, 0.5%, 1%, 2%, 3%, and 5% by mass), were characterized using powder X-ray diffraction (XRD) to confirm their crystalline structure and matched LaB₃O₆ reference pattern in ICSD. The TL glow peaks of Nd³⁺ doped LaB₃O₆ subjected to 5<!-- --> <!-- -->Gy beta radiation emerged notably at 75˚C, 125˚C and 257˚C, accompanied by shoulder above 320˚C. The optimal Nd³⁺ doping concentration for TL efficiency was 0.25%. TL response of LaB₃O₆:Nd³⁺ (0.25%) against doses ranging from 0.1<!-- --> <!-- -->Gy to 750<!-- --> <!-- -->Gy indicated excellent linear behavior up to 20<!-- --> <!-- -->Gy (<em>b</em>=1.003, R²= 0.999). Ten cycles of reusability testing showed that the deviations did not exceed 2% for either the maximum TL intensity (<em>I</em>_m) or peak area variation. The TL signal faded by about 13% in 26 days of storage time. Various heating rates (VHR), <em>T</em>_m-<em>T</em>_stop, initial rise (IR), and computerized glow curve deconvolution (CGCD) methods were employed to ascertain the individual peak numbers and kinetic parameters of LaB₃O₆:0.25%Nd³⁺ sample. The CGCD result revealed that it is possible to distinguish five overlapped groups of components peaked at 249, 272, 303, 327 and 354<!-- --> ^oC.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"133 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936477","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":"Tunable N-doped Carbon Dots/SnO2 Interface as a Stable Artificial Solid Electrolyte Interphase for High-Performance Aqueous Zinc-Ion Batteries","authors":"Mohan Gopalakrishnan, Myo Thandar Hlaing, Thirumoorthy Kulandaivel, Wathanyu Kao-ian, Mohammad Etesami, Wei-Ren Liu, Mai Thanh Nguyen, Tetsu Yonezawa, Wanwisa Limphirat, Soorathep Kheawhom","doi":"10.1016/j.jallcom.2025.178521","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.178521","url":null,"abstract":"Poor stability of zinc (Zn) anode hinders the use of aqueous zinc-ion batteries (AZIBs) for large-scale energy storage. Here, we report an effective artificial solid electrolyte interphase (ASEI) using N-doped carbon dots (CDs) and SnO₂ to stabilize Zn anodes. By optimizing the CDs/SnO₂ ratio, we can synthesize porous composites to construct \"bayberry\" and flower-like morphologies. The N-doped CDs/SnO₂ anode creates surface dipoles and changes in charge distribution, allowing Zn ions to move to nitrogen functionalized sites with reduced adsorption barriers. Furthermore, hydroxyl oxygen boosts the surface's hydrophilicity, resulting in stronger adhesion to the Zn anode and better ion accessibility. This generates dense nucleation sites for uniform Zn deposition. The CDs/SnO₂@Zn electrode achieves a low nucleation potential of 47<!-- --> <!-- -->mV and maintains 99.6% coulombic efficiency (CE) over 1000 cycles at 2<!-- --> <!-- -->mA<!-- --> <!-- -->cm^-2. In the symmetrical cells, the modified Zn anode exhibits stable cycling for 1,200<!-- --> <!-- -->h at 1 mAh cm^-2. A full cell with CDs/SnO₂@Zn anode and MnO₂ cathode retains 96.6% capacity after 800<!-- --> <!-- -->h. This study introduces a promising strategy for stabilizing Zn anodes and offers valuable insights for designing dendrite-free electrodes in next-generation AZIBs.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"22 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936957","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":"Research progress and prospects of Ce-containing NdFeB permanent magnets","authors":"Xiheng Shao, Xiaoqing Zhou, Shuhan Liang, Chao Yang, Yongsheng Que, Bing Guo, Huangping Bao, Guocai Tang, Xiangling Yan, Jinsheng Bao, Laishun Qin, Kangying Shu, Da Chen, Dong-Liang Peng","doi":"10.1016/j.jallcom.2025.178567","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.178567","url":null,"abstract":"NdFeB magnets are permanent magnetic materials based on the intermetallic compound Nd₂Fe₁₄B, which are widely used due to their excellent magnetic properties. With the rapid advancement of the NdFeB magnet industry, the consumption of crucial rare earth elements such as Pr, Nd, Dy, and Tb has significantly increased, resulting in escalating raw material prices. Conversely, the element Ce accumulates in large quantities and remains underutilized. To mitigate the production costs associated with NdFeB magnets and promote a more balanced utilization of rare earth resources, considerable attention has been directed towards Ce-containing NdFeB ((Ce,Nd)-Fe-B) magnets in recent years. This review article summarizes the research progress on (Ce, Nd)-Fe-B magnets. Firstly, the distinctions in phase composition and intrinsic properties between CeFeB and NdFeB magnets are presented, and the coercivity mechanisms of (Ce, Nd)-Fe-B magnets are then explored. Subsequently, the influences of factors such as Ce content, addition of metallic elements, and heat treatment on the magnetic properties and microstructure of rapidly-quenched and sintered (Ce, Nd)-Fe-B magnets are discussed. Meanwhile, the grain boundary diffusion processes of (Ce, Nd)-Fe-B magnets are scrutinized. Finally, the challenges faced by (Ce, Nd)-Fe-B magnets and the corresponding solutions are proposed, and the prospects and further developments in this exciting field of (Ce,Nd)-Fe-B magnets are also suggested.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"15 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936480","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":"Synergistic improvement of ultra-high strength and ductility of Cu-15Ni-8Sn alloy induced by multi-pass rotary swaging and aging treatment","authors":"Yanjun Zhou, Kaixuan Jiang, Shaodan Yang, Ran Yang, Pengfei Yue, Fei Zhou, Wenhao Yang, Juan Du, Huiwen Guo, Xiaowen Peng, Jingzhao Yang, Kexing Song","doi":"10.1016/j.jallcom.2025.178569","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.178569","url":null,"abstract":"The Cu-15Ni-8Sn alloy can achieve ultra-high strength through heat treatment processes, but the significant reduction in its ductility limits its wider applications. How to synergistically enhance the strength and ductility of this alloy is a hot research topic. In this study, the industrial Cu-15Ni-8Sn alloy was taken as the research object, and the changes in alloy grain characteristics and mechanical properties under different cumulative deformations were compared by multi-pass rotary swaging deformation of the solution-state Cu-15Ni-8Sn alloy followed by aging heat treatment with different holding times. The evolution of phase structures in the rotary-swaged Cu-15Ni-8Sn alloy during the aging process was investigated. The synergy mechanism of rotary swaging and aging process on the strength and ductility of the alloy was revealed. The results showed that with the increase of rotary swaging deformation, the Cu-15Ni-8Sn alloy grains gradually elongates until they tended to be fibrous, and the grain texture changed from random distribution to &lt;111&gt; and &lt;100&gt; distribution. Rotary swaging deformation promotes the precipitation of the D0₂₂ ordered phase. After 75% rotary swaging deformation and aging treatment at 400°C for 60<!-- --> <!-- -->minutes, the ultimate tensile strength and elongation of the Cu-15Ni-8Sn alloy reaches 1405<!-- --> <!-- -->MPa and 6.1%, respectively. The characteristics of high strain rate and large cumulative deformation of rotary swaging activate more slip systems and twin systems, improve the strengthening efficiency, and are conducive to uniform deformation and plasticity of metals. Rotary swaging deformation promotes the formation of D0₂₂ ordered phase during aging, and the interaction between nanoscale precipitates and dislocations produces a significant precipitation strengthening effect.Based on the above synergistic effects, the results of this paper realize the simultaneous improvement of strength and plasticity of Cu-15Ni-8Sn alloy. This optimization of comprehensive mechanical properties makes the alloy very suitable for use in complex environments requiring high strength and good machining capability.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"10 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936492","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":"Amorphous/crystalline NiZr heterojunction nanorods for alkaline hydrogen evolution reaction prepared by magnetron sputtering","authors":"Jinsen Tian, Junhao Qin, Hao Zhang, Mingwei Tang, Jing Wu, Jiahua Zhu, Jun Shen","doi":"10.1016/j.jallcom.2025.178575","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.178575","url":null,"abstract":"Design of low-cost hydrogen evolution reaction (HER) electrocatalysts with high efficiency is important for the application of hydrogen. In this work, magnetron sputtering was utilized to prepare amorphous, crystalline and amorphous/crystalline (a/c) NiZr heterostructure nanorods catalysts. With increasing sputtering power of Zr, the deposited films transformed from crystalline to a/c heterojunction and amorphous structure. Compared with its amorphous and crystalline counterparts, the a/c heterojunction presented superior performance and stability in alkaline solution. The overpotential to reach 10<!-- --> <!-- -->mA<!-- --> <!-- -->cm^-2 and Tafel slope is low as 92<!-- --> <!-- -->mV and 66<!-- --> <!-- -->mV dec^-1, respectively. This is mainly due to the high intrinsic activity and electron transfer rate caused by the nanorods and a/c heterojunction structure. Density functional theory (DFT) calculations confirmed that compared with crystalline, both the water dissociation energy and hydrogen absorption energy can be lowered by forming a/c heterostructure. This work presents a method to prepare an efficient a/c heterojunction electrocatalyst via modulating magnetron sputtering conditions.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"48 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142937002","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":"Ratiometric electrochemical sensor based on methylene blue-functionalized Ti3C2Tx MXene/Pt nanoparticle composites for reliable detection of carbendazim","authors":"Ying Wang, Xiaohong Liu, Hao Tan, Yiming Yang, Xi Wang, Chengxi Zhu","doi":"10.1016/j.jallcom.2025.178538","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.178538","url":null,"abstract":"Rapid and reliable detection of pesticide residues is critical in public health, food safety and environmental control. Herein, a novel ratiometric electrochemical sensor based on methylene blue-functionalized Ti₃C₂T_x MXene/Pt nanoparticle composites (MXene@MB/PtNPs) was developed for reliable detection of carbendazim (CBZ). The MXene@MB/PtNPs composites were synthesized by a mild and simple room-temperature approach. Here, the decoration of Pt nanoparticles can enhance the conductivity and catalytic activity of the composites. The functional electroactive molecule methylene blue (MB) implanted in MXene could not only hinder the aggregation of MXene layers and promote the electron transfer activity of the materials, but also serve as an internal reference probe to form a ratiometric sensing strategy. The obtained MXene@MB/PtNPs composites showed a superior electrochemical catalytic performance toward CBZ. Based on the ratiometric signal of the response current to the reference current (I_CBZ/I_MB), the developed sensor possessed a wide linear range of 10<!-- --> <!-- -->ng<!-- --> <!-- -->mL^-1 to 30<!-- --> <!-- -->μg<!-- --> <!-- -->mL^-1 with a low LOD of 4.2<!-- --> <!-- -->ng<!-- --> <!-- -->mL^-1. Compared with single-signal detection, the developed ratiometric electrochemical sensor could offer more accurate and reliable results, and exhibited favorable selectivity, reproducibility and long-term stability, and great application potential in pesticide residue detection in agricultural products.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"83 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142937613","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":"Tailoring the Product Selectivity of Electrochemical CO2 Reduction at Copper-Tin Composite Oxide Nanofibers","authors":"Subin Choi, Taehui Kwon, Youngmi Lee","doi":"10.1016/j.jallcom.2025.178574","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.178574","url":null,"abstract":"Electrochemical reduction of carbon dioxide (CO₂RR) has been receiving attention as an attractive technique to convert CO₂ into various useful resources. Because CO₂RR generally produces diverse products and competes with hydrogen reduction reaction (HER), the development of efficient electrocatalysts exhibiting high product selectivity is required. This paper demonstrates a simple approach to synthesize Cu-Sn bimetallic oxide nanofibers with various Cu/Sn composition ratios using electrospinning and post-calcination. The prepared nanofibers (denoted as Cu₁Sn_<em>x</em>O_<em>y</em>, <em>x</em> = 0.5, 1, 2) showed excellent electrocatalytic activity and product selectivity for CO₂RR, which were drastically improved from those of single metal oxides (i.e, CuO and SnO₂). Of great importance, the product selectivity could be finely controlled by changing the Cu/Sn content ratio in Cu₁Sn_<em>x</em>O_<em>y</em> nanofibers. In fact, Cu-enriched Cu₁Sn_0.5O_<em>y</em> showed nearly exclusive faradaic efficiency (FE) for carbon monoxide (CO) at −0.8 V_RHE (~95%); and Sn-enriched Cu₁Sn₂O_<em>y</em> exhibited high FE for formic acid at −0.9 V_RHE (~91%), supporting the exceptionally high selectivity to CO and formic acid, respectively. In addition, both Cu₁Sn_0.5O_<em>y</em> and Cu₁Sn₂O_<em>y</em> nanofibers barely generated hydrogen during CO₂RR, suppressing HER successfully.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"67 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936479","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":"Carbon nanowire modified Nextel 610/SiOC composites with gradient periodic structure for enhanced broadband electromagnetic-wave absorption performance at elevated temperatures","authors":"Fan Yang, Yongpeng Dong, Yuqiu Wang, Jimei Xue, Shangwu Fan, Xiaomeng Fan, Laifei Cheng","doi":"10.1016/j.jallcom.2025.178527","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.178527","url":null,"abstract":"For electromagnetic wave absorbing ceramic matrix composites, it is crucial to control the loss mechanism to achieve stable high-temperature broadband absorption performance. In this work, multiscale structural design is utilized to enrich EMW loss mechanism, synergistically improving the EMW absorption capacity and bandwidth. Firstly, based on the tunability of the fiber preform, three-dimensional carbon fiber periodic units were constructed on an N610 fiber cloth. Then, the intrinsic electromagnetic properties of the N610 fibers were modified by introducing nanoscale absorption units, namely carbon nanowires. The carbon nanowires were diffusely distributed in transparent N610/SiOC composites by controlling the reaction conditions, forming a large number of heterogeneous interfaces and conductive networks. The carbon fiber and carbon nanowires, together with the notable conductivity difference with respect to the N610/SiOC composites, significantly enhance the polarization loss and conductive loss. Besides, the periodically arranged carbon fibers can trap the incident EMWs and reduce their transmission, promoting reflection, scattering, and absorption. The designed N610/SiOC composites exhibit superior EMW absorption performance from room temperature to 600 ℃, with a reflection loss less than −8<!-- --> <!-- -->dB across the entire investigated band and an effective absorption bandwidth exceeding 10.7<!-- --> <!-- -->GHz at 4–18<!-- --> <!-- -->GHz. This innovative multiscale design approach, characterized by a discrete distribution of absorbing units with a high electronegativity difference, represents a fresh avenue for advancing the development of high-temperature and wide-band EMW-absorbing CMCs.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142934528","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":"Simplifying the microstructure and improving the corrosion resistance of the FeCoCrNiNbx high-entropy alloys via homogenizing annealing heat treatment","authors":"Chang Liu, Decheng Kong, Qingbiao Tan, Jian He, Rui Wang, Guoliang Zhu, Baode Sun, Yong Zou","doi":"10.1016/j.jallcom.2025.178565","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.178565","url":null,"abstract":"FeCoCrNiNb_x high-entropy alloys were subjected to a homogenizing annealing heat treatment at 1200 ℃ for 4<!-- --> <!-- -->h, which simplified the microstructure of the alloys and reduced the degree of compositional segregation. After heat treatment, FeCoCrNi alloy still maintained the single-phase FCC structure, and the grains grew into coarser columnar crystals reducing the number of grains; the intergranular eutectic FCC phase of FeCoCrNiNb_x (x=0.15, 0.33) alloys disappeared and the segregated Laves phase content in FeCoCrNiNb_x (x=0.15, 0.33, 0.5) alloys was significantly reduced. The special Ostwald ripening phenomenon was discovered in the FeCoCrNiNb_0.5 alloy. The homogenizing heat treatment drastically raised the work function (WF) of the alloys by nearly a factor of one, improved the homogeneity of WF distribution in each phase, and weakened the tendency of selective dissolution; moreover, it also improved the compactness of the alloys' passive films, significantly decreased the maintaining passivation current density of the passive films by more than one order of magnitude, enhanced the tendency of the alloys repassivation, and ultimately improved the corrosion resistance of the alloys in 3.5<!-- --> <!-- -->wt.% NaCl solution. The thermodynamic calculation of alloy phase diagrams is of vital significance in guiding the design of alloy compositions, optimizing heat treatment processes, and improving alloy properties.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"14 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936517","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":"SERS substrates of Ag nanoparticles prepared by a magnetron sputtering method and the activation by halide solutions","authors":"W. Chen, J. Chen, X.N. Li, N. Zhou, L.Y. Zhang, C.Y. Ma, Q.Y. Zhang","doi":"10.1016/j.jallcom.2025.178537","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.178537","url":null,"abstract":"Surface enhanced Raman spectroscopy (SERS) is a powerful tool of detecting trace molecules, but the decay of Ag-based nanostructures in the SERS activity is one of problems in applications. In this work, a magnetron sputtering method is used to prepare Ag nanoparticles (NPs) on glass substrates, which exhibit a pretty good reproducibility and a detection limit of rhodamine-6G as low as 1×10⁻¹² M. By exposing the Ag NPs to ambient air, the decay of SERS activity is investigated and the inactive SERS substrates are activated by halide solutions, in which the solution of 1×10⁻³ M KCl exhibits the best activation effects. It is found that the modification of halide solutions enables the Ag NPs to undergo a process of dissolution and recrystallization and thus leads to the removal of oxides and contaminations and the activation of SERS activity. Besides the re-formed surfaces of Ag NPs, the variation in the size distribution has important impacts on the Raman enhancement of activated SERS substrates. Statistical analysis reveals that the best hot spots probably appear on the Ag NPs with the sizes close to ~ 45<!-- --> <!-- -->nm and the density is in association with the type and concentration of halide solution.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"67 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142936494","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}