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A dual-channel optical fiber sensor based on surface plasmon resonance for heavy metal ions detection in contaminated water
摘要： Transition metal phosphides (TMPs) have recently emerged as an important type of electrode material for use in supercapacitors thanks to their intrinsically outstanding specific capacity and high electrical conductivity. Herein, we report the synthesis of bimetallic CoxNi1?xP ultrafine nanocrystals supported on carbon nanofibers (CoxNi1?xP/CNF) and explore their use as positive electrode materials of asymmetric supercapacitors. We find that the Co:Ni ratio has a significant impact on the specific capacitance/capacity of CoxNi1?xP/CNF, and CoxNi1?xP/CNF with an optimal Co:Ni ratio exhibits an extraordinary specific capacitance/capacity of 3514 F g?1/1405.6 C g?1 at a charge/discharge current density of 5 A g?1, which is the highest value for TMP-based electrode materials reported by far. Our density functional theory calculations demonstrate that the significant capacitance/capacity enhancement in CoxNi1?xP/CNF, compared to the monometallic NiP/CNF and CoP/CNF, originates from the enriched density of states near the Fermi level. We further fabricate a flexible solid-state asymmetric supercapacitor using CoxNi1?xP/CNF as positive electrode material, activated carbon as negative electrode material, and a polymer gel as the electrolyte. The supercapacitor shows a specific capacitance/capacity of 118.7 F g?1/166.2 C g?1 at 20 mV s?1, delivers an energy density of 32.2 Wh kg?1 at 3.5 kW kg?1, and demonstrates good capacity retention after 10000 charge/discharge cycles, holding substantial promise for applications in flexible electronic devices.
关键词： cobalt phosphide,high specific capacitance,transition metal phosphide,nickel phosphide,asymmetrical supercapacitor
更新于2025-09-11 14:15:04
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Temperature- and Time-Dependent Mechanical Behavior of Post-Treated IN625 Alloy Processed by Laser Powder Bed Fusion
摘要： The microstructure and mechanical properties of IN625 alloy processed by laser powder bed fusion (LPBF) and then subjected to stress relief annealing, high temperature solution treatment, and hot isostatic pressing were studied. Tensile testing to failure was carried out in the 25–871°C temperature range. Creep testing was conducted at 760°C under 0.5–0.9 yield stress conditions. The results of the present study provided valuable insights into the static and creep properties of LPBF IN625 alloy, as compared to a wrought annealed alloy of similar composition. It was shown that at temperatures below 538°C, the mechanical resistance and elongation to failure of the LPBF alloy were similar to those of its wrought counterpart, whereas at higher temperatures, the elongation to failure of the LPBF alloy became significantly lower than that of the wrought alloy. The solution-treated LPBF alloy exhibited significantly improved creep properties at 760°C as compared to the wrought annealed alloy, especially under intermediate and low levels of stress.
关键词： additive manufacturing,nickel-based superalloys,high temperature mechanical properties,creep resistance
更新于2025-09-11 14:15:04
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Variation of Surface Topography in Laser Powder Bed Fusion Additive Manufacturing of Nickel Super Alloy 625
摘要： This document provides details on the files available for download in the dataset “Variation of Surface Topography in Laser Powder Bed Fusion of Nickel Super Alloy 625.” The following sections provide details on the experiments, methods, and data files. The experiment detailed in this document methodically varies part position and surface orientation relative to the build plate and relative to the recoater blade. This dataset provides surface height data for analysis and development of correlations by the greater research community.
关键词： additive manufacturing,focus variation,IN625,surface texture,surface topography,nickel super alloy 625,laser powder bed fusion
更新于2025-09-11 14:15:04
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Laser cladding process of Cobalt and Nickel based hard-micron-layers on 316L-stainless-steel-substrate
摘要： In the present study, two different types of coatings such as Cobalt (Co-Cr-W-C) and Nickel (Ni-Cr-B-Si-C) based layers have produced using a high power of Ytterbium-doped yttrium aluminum garnet (Yb:YAG) disk laser on 316L stainless steel substrate. Then the coatings were analyzed to expose their phase characterization, microstructure, and hardness using X-ray diffraction analysis, electron microscopes and microhardness tester. Further, tribo-test has performed through a ball-on-plate machine to analyze the wear properties of coatings. Besides, worn-surfaces of cladding and surface roughness have examined. The results showed that both Cobalt and Nickel based cladding have exhibited a dendrite homogeneous structure with some changes in shape and grain size due to higher cooling rates. XRD results indicate that the mixing of a γ-Co peak with other metastable phases such as Cr7C3 and Cr23C6 were noticed on Cobalt coating and γ-Ni rich matrix was the most dominant peak in Nickel-based coating. Microhardness of the cladding layers has remarkably increased than the substrate. The wear performance of Nickel cladding has increased than Cobalt cladding and substrate sample, which reveals that Nickel-based laser cladding plays a role in wear resistance. The analyzed wear track indicates that adhesion and abrasion were the two major wear mechanisms.
关键词： cladding,316L,alloys,wear,microstructure,nickel,steel,performance,roughness,stainless,cobalt,surface
更新于2025-09-11 14:15:04
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Pulsed Laser Deposition of Rocksalt Magnetic Binary Oxides
摘要： Magnetic binary oxides with the rocksalt structure constitute an important class of materials for potential applications as electronic or electrochemical devices. Moreover, they often become a theoretical playground, due to the simple electronic and crystal structures, in the quest for novel phenomena. For these possibilities to be realized, a necessary prerequisite would be to grow atomically ordered and controllably-strained binary oxides on proper substrates. Here we systematically explore the use of pulsed laser deposition technique (PLD) to grow three basic oxides that have rocksalt structure but different chemical stability in the ambient atmosphere: NiO (stable), MnO (metastable) and EuO (unstable). By tuning laser fluence FL, an epitaxial single-phase NiO thin-film growth can be achieved in a wide range of growth temperatures 10 ≤ TG ≤750 °C. At the lowest TG, the out-of-plane strain raises to 1.5%, which is five times higher than in NiO film grown at 750 °C. MnO thin films that had long-range order were successfully deposited on the MgO substrates after appropriate tuning of deposition parameters. The growth of MnO phase was strongly influenced by FL and the TG. EuO films with satisfactory quality were deposited by PLD after oxygen availability had been minimized. Synthesis of EuO thin films at rather low TG = 350 °C prevented thermally-driven lattice relaxation and allowed growth of strained films. Overall, PLD was a quick and reliable method to grow binary oxides with rocksalt structure in high quality that can satisfy requirements for applications and for basic research.
关键词： Thin films,Nickel monoxide,Long-range ordered,Manganese monoxide,Europium monoxide,Strain engineering
更新于2025-09-11 14:15:04
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A DLTS Perspective on Electrically Active Defects in Plated Crystalline Silicon n <sup>+</sup> p Solar Cells
摘要： Laser ablation (LA) has been compared with standard wet etching for contact opening in crystalline silicon n+p solar cells, from a perspective of electrically active defects, assessed by Deep-Level Transient Spectroscopy (DLTS). Copper metallization is employed, including a plated nickel diffusion barrier. It is shown that a hole trap around 0.17 eV above the valence band is systematically present in the depletion region of the junctions, irrespective of the contact opening method. This level could correspond with the substitutional nickel donor level in silicon and indicates that Ni in-diffusion occurs during the contact processing. No clear evidence for the presence of electrically active copper has been found. In addition, two other hole traps H2 and H3, belonging to point defects, have been observed after wet etching and standard LA, while for the highest laser power (hard LA) a broad band develops around 175 K, which is believed to be associated with dislocations, penetrating the p-type base region. Evidence will also be given for the impurity decoration of the dislocations, which enhances their electrical activity.
关键词： Deep-Level Transient Spectroscopy (DLTS),copper metallization,electrically active defects,laser ablation,nickel diffusion barrier,wet etching,crystalline silicon n+p solar cells
更新于2025-09-11 14:15:04
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[IEEE 2017 IEEE 44th Photovoltaic Specialists Conference (PVSC) - Washington, DC (2017.6.25-2017.6.30)] 2017 IEEE 44th Photovoltaic Specialist Conference (PVSC) - Study of spatial distribution of electrical, optical and structural properties of magnetron sputtered AZO thin films
摘要： China is now the world's largest producer and consumer of nickel. As an important strategic metal, nickel is widely used in various industries of national economy. Whether the supply of nickel ore resources is sufficient or not directly restricts the development of downstream industries. It is becoming more and more important to evaluate the safety of nickel resources in our country, and to formulate the corresponding safety strategy. This paper uses fuzzy analytic hierarchy process to evaluate the safety of nickel resources in China, and overcomes the subjectivity and singleness of traditional evaluation methods. On the basis of the analytic hierarchy process to determine the weight, the fuzzy comprehensive evaluation is introduced. At present, the safety situation of nickel resources in our country is in a more dangerous level, and we need to take positive measures to improve it.
关键词： analytic hierarchy process,nickel resources,fuzzy comprehensive evaluation,safety evaluation
更新于2025-09-11 14:15:04
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Controlled synthesis of porous nanosheets-assembled peony-like cobalt nickel selenides for triiodide reduction in dye-sensitized solar cells
摘要： Developing counter electrode (CE) materials with outstanding catalytic performance and low cost is a critical step for the large-scale application of dye-sensitized solar cells (DSSCs). In this work, a facile bottom-up solvothermal route followed by a selenization process was introduced to synthesize the hierarchical cobalt nickel selenides nanoflowers (CoeNieSe NFs) consisted of numerous cross-linked porous nanosheets. The structure and composition of CoeNieSe NFs could be regulated by simply tuning the feed molar ratio of Ni/Co. Pro?ting from the well structural nature, relatively large surface area, appropriate porosity, optimized crystal structure and the synergy of multiple components, CoeNieSe NFs display superior catalytic activity toward the triiodide reduction. Impressively, the power conversion ef?ciency (PCE) of DSSC assembled with CoeNieSe-1:1 NFs CE is 9.00%, which outperforms that of Pt CE (7.97%). This strategy sheds a new light on the controlled synthesis of advanced hierarchical materials for the application in the ?eld of sustainable energy.
关键词： Dye-sensitized solar cells,Counter electrode,Cobalt nickel selenides,Triiodide reduction,Peony-like structure
更新于2025-09-11 14:15:04
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Nickel nanoparticles‐based saturable absorber: Toward compact multiwavelength Yb‐doped fiber pulsed lasers near 1 μm region
摘要： We experimentally demonstrate a compact pulsed dual-wavelength Ytterbium-doped fiber laser (YDF) based on Nickel nanoparticles (Ni-NPs) as a Q-switcher and optical stabilizer. By integrating the Ni-NPs saturable absorber (SA) in the cavity, and adjust the 975 nm diode pump power to 185 mW, a self-starting passively Q-switched was generated at a central wavelength of 1038.5 nm. By exploiting the extra high nonlinearity of Ni-NPs, the homogenous gain broadening of the YDF oscillator can be suppressed. Consequently, at a pump power of 195 mW, a stable dual-wavelength passively Q-switching laser has been generated at room temperature without any intracavity spectral filters or modulation elements. As increases the pump power up to the maximum value of 288 mW, the Ytterbium-doped fiber laser observed that the smallest pulse width, the maximum repetition rate, and the maximum pulse energy of 1.44 μs, 100.1 kHz, and 4.45 nJ, respectively. The Ni-NPs SA proof its potential in generating multi-wavelength pulsed laser in the 1 μm region for different photonic applications.
关键词： Q-switching,fiber laser,multiwavelength,nickel nanoparticles
更新于2025-09-11 14:15:04
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Synthesis and Self-Assemble Nanofibers of Tetra Phenoxy Substituted Nickel Phthalocyanine
摘要： Tetra phenoxy substituted nickel phthalocyanine nanofibers were synthesized in large scale by self-assemble. The FESEM and HRTEM micrographs indicated that the sizes of the fibers are 20-60 nm in width and 0.2-5 μm in length. The formation mechanism of nickel phthalocyanine fibers was discussed and studied by XRD and UV-visible spectra. The nickel phthalocyanine nanofibers have potential application on organic function devices.
关键词： Nickel phthalocyanine,Nanofibers,Synthesis,Self-assemble
更新于2025-09-11 14:15:04