Facile synthesis of Cu/Ni alloy nanospheres with tunable size and elemental ratio

Liu, Jinglei; Zheng, Yiqun; Hou, Shifeng

doi:10.1039/c7ra06062a

Cited by 15 publications

(12 citation statements)

References 57 publications

(59 reference statements)

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“…The XRD pattern of the NP dispersion (black line in Figure 1d) exhibits reflections of crystalline Ni and Cu, indicating that the NPs contain crystalline domains. This finding of non‐oxidized Ni and Cu in the XRD pattern is in accordance with Liu et al and An et al [ 34,36 ]…”

Section: Resultssupporting

confidence: 92%

“…The XRD data suggested non-oxidized NiCu NPs, while additional investigation with XAS, ASAXS, and XPS revealed the formation of an NiO shell in addition to metallic Ni and Cu. Similar characteristics were found by An et al, who found no signs of oxidation in the XRD pattern, while the XPS measurements indicated the existence of Ni, Cu, O, and C. [34] The characterization of Ni and NiCu NPs with XRD to ensure the purity [36,43] seems therefore not to be overall sufficient, but it gains by the combination of different methods, which are not relying on the crystallinity. [34,44] S8, Supporting Information.…”

Section: Amount Of Stabilizer (Top/metal Ratio 15-50)supporting

confidence: 77%

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Size‐Tunable Ni–Cu Core–Shell Nanoparticles—Structure, Composition, and Catalytic Activity for the Reverse Water–Gas Shift Reaction

et al. 2022

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A facile and efficient methodology is described for the solvothermal synthesis of size‐tunable, stable, and uniform NiCu core–shell nanoparticles (NPs) for application in catalysis. The diameter of the NPs is tuned in a range from 6 nm to 30 nm and to adjust the Ni:Cu ratio from 30:1 to 1:1. Furthermore, the influence of different reaction parameters on the final NPs is studied. The NPs are structurally characterized by a method combination of transmission electron microscopy, anomalous small‐angle X‐ray scattering, X‐ray absorption fine structure, and X‐ray photoelectron spectroscopy. Using these analytical methods, it is possible to elucidate a core–shell–shell structure of all particles and their chemical composition. In all cases, a depletion from the core to the shell is observed, with the core consisting of NiCu alloy, surrounded by an inner Ni‐rich shell and an outer NiO shell. The SiO2‐supported NiCu core–shell NPs show pronounced selectivity of >99% for CO in the catalytic reduction of CO2 to CO using hydrogen as reactant (reverse water–gas shift reaction) independent of size and Ni:Cu ratio.

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Section: Resultssupporting

confidence: 92%

Section: Amount Of Stabilizer (Top/metal Ratio 15-50)supporting

confidence: 77%

Size‐Tunable Ni–Cu Core–Shell Nanoparticles—Structure, Composition, and Catalytic Activity for the Reverse Water–Gas Shift Reaction

et al. 2022

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“…26,27,28 However, our results differ from the work of Liu et al who obtained alloys using a similar approach but at a lower temperature i.e. 180 °C and with longer reaction time of 4 h. 41 In our reaction, the solution readily turned dark at ca. 180 °C.…”

Section: Synthesis and Characterization Of Bimetallic Cu 1-x Ni X Nancontrasting

confidence: 94%

Bimetallic Phosphide (Ni,Cu)₂P Nanoparticles by Inward Phosphorus Migration and Outward Copper Migration

et al. 2019

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Bimetallic phosphide nanoparticles are drawing a great interest as a family of nanomaterials. Controlling their fine features such as surface composition, core crystal structure and overall composition is a key to further application. Copper and nickel are particularly interesting first-raw metals for their abundance and relevance in several branches of catalysis. In order to synthesize crystalline bimetallic phosphide Ni-CuP nanoparticles, core-shell copper-nickel nanoparticles were reacted with white phosphorus (P 4). Surprisingly, hollow monocrystalline (Ni,Cu) 2 P nanoparticles were formed alongside Cu nanoparticles and crystallized in a phase isostructural to Ni 2 P. Using a combination of local and ensemble analytic techniques, we showed that this unique structure is the result of several competing processes: phosphorus migration, interaction of stabilizing ligands with copper as well as metal phosphide phase crystallization. This study provides important mechanistic insights to rationalize bimetallic phosphide nanoparticles syntheses. Beyond metal phosphides, this wellcharacterized case study about competing diffusion and crystallization processes is of major relevance for the advancement of materials sciences at the nanoscale.

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“…Liu et al . 20 reports on the preparation of Cu-Ni nano spheres by a one-pot chemical synthesis process, showing the easy control of both size as well as elemental ratio of the product against the precursor ratio. Morphological, crystallographic, and stability aspects of the nanoparticles are also reported.…”

Section: Introductionmentioning

confidence: 99%

Large scale synthesis of copper nickel alloy nanoparticles with reduced compressibility using arc thermal plasma process

Das

Gaboardi

et al. 2021

Sci Rep

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Among the various methods employed in the synthesis of nanostructures, those involving high operating temperature and sharp thermal gradients often lead to the establishment of new exotic properties. Herein, we report on the formation of Cu-Ni metallic alloy nanoparticles with greatly enhanced stiffness achieved through direct-current transferred arc-thermal plasma assisted vapour-phase condensation. High pressure synchrotron X-ray powder diffraction (XRPD) at ambient temperature as well as XRPD in the temperature range 180 to 920 K, show that the thermal arc-plasma route resulted in alloy nanoparticles with much enhanced bulk modulus compared to their bulk counterparts. Such a behaviour may find an explanation in the sudden quenching assisted by the retention of a large amount of local strain due to alloying, combined with the perfect miscibility of the elemental components during the thermal plasma synthesis process.

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Facile synthesis of Cu/Ni alloy nanospheres with tunable size and elemental ratio

Abstract: We report a facile synthesis of copper/nickel (Cu/Ni) alloy nanospheres in high purity and with tunable, well-controlled sizes and elemental ratios.

Cited by 15 publications

References 57 publications

Size‐Tunable Ni–Cu Core–Shell Nanoparticles—Structure, Composition, and Catalytic Activity for the Reverse Water–Gas Shift Reaction

Size‐Tunable Ni–Cu Core–Shell Nanoparticles—Structure, Composition, and Catalytic Activity for the Reverse Water–Gas Shift Reaction

Bimetallic Phosphide (Ni,Cu)₂P Nanoparticles by Inward Phosphorus Migration and Outward Copper Migration

Large scale synthesis of copper nickel alloy nanoparticles with reduced compressibility using arc thermal plasma process

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Facile synthesis of Cu/Ni alloy nanospheres with tunable size and elemental ratio

Abstract: We report a facile synthesis of copper/nickel (Cu/Ni) alloy nanospheres in high purity and with tunable, well-controlled sizes and elemental ratios.

Cited by 15 publications

References 57 publications

Size‐Tunable Ni–Cu Core–Shell Nanoparticles—Structure, Composition, and Catalytic Activity for the Reverse Water–Gas Shift Reaction

Size‐Tunable Ni–Cu Core–Shell Nanoparticles—Structure, Composition, and Catalytic Activity for the Reverse Water–Gas Shift Reaction

Bimetallic Phosphide (Ni,Cu)2P Nanoparticles by Inward Phosphorus Migration and Outward Copper Migration

Large scale synthesis of copper nickel alloy nanoparticles with reduced compressibility using arc thermal plasma process

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Bimetallic Phosphide (Ni,Cu)₂P Nanoparticles by Inward Phosphorus Migration and Outward Copper Migration