Characterization of magnetic Ni clusters on graphene scaffold after high vacuum annealing

Zhang, Zhenjun; Matsubayashi, Akitomo; Grisafe, Benjamin; Lee, Ji Ung; Lloyd, J. R.

doi:10.1016/j.matchemphys.2015.12.036

Cited by 16 publications

(8 citation statements)

References 40 publications

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“…The low amount of Ni present in NiNP@rGO Type 1 must not mislead: XPS is extremely surface sensitive (few nm) and when the Ni nanoparticles are wrapped in rGO, as showed in TEM images in Figure 3c, the XPS signal from Ni is significantly attenuated. Metallic phase was observed exclusively on Type 2 in accordance with previous XPS results by Zhang,16 where Ni clusters with core-shell structure were observed: the external…”

Section: Accepted Manuscriptsupporting

confidence: 90%

NiNP@rGO Nanocomposites as Heterogeneous Catalysts for Thiocarboxylation Cross-Coupling Reactions

et al. 2021

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A new type of ligand-free Ni-nanoparticles supported on rGO (size distribution average d = 9 ± 3 nm) is prepared and fully characterized via morphological (Fe-SEM), structural (P-XRD, HR-TEM) and spectroscopic (ICP-EOS, XPS) analysis tools. The metal composite was effectively employed in the unprecedented heterogeneously Ni-assisted cross-coupling reaction of aryl/vinyl iodides and thiocarboxylates. A range of sulphur-containing aryl as well as vinyl derivatives (15 examples) was achieved in high yields (up to 82%), mild reaction conditions and wide functional group tolerance.

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Section: Accepted Manuscriptsupporting

confidence: 90%

NiNP@rGO Nanocomposites as Heterogeneous Catalysts for Thiocarboxylation Cross-Coupling Reactions

et al. 2021

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“…S2). Owing to the poor wettability and small surface free energy of graphene (22), the Ni layer is dispersed randomly to form discrete nano-islands on graphene, as revealed by atomic force microscopy (AFM) (Fig. 1, B and C).…”

Section: Resultsmentioning

confidence: 99%

Graphene-mediated ferromagnetic coupling in the nickel nano-islands/graphene hybrid

et al. 2021

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Nanoscale magnetic structures are fundamental to the design and fabrication of spintronic devices and have exhibited tremendous potential superior to the conventional semiconductor devices. However, most of the magnetic moments in nanostructures are unstable due to size effect, and the possible solution based on exchange coupling between nanomagnetism is still not clear. Here, graphene-mediated exchange coupling between nanomagnets is demonstrated by depositing discrete superparamagnetic Ni nano-islands on single-crystal graphene. The heterostructure exhibits ideal two-dimensional (2D) ferromagnetism with clear hysteresis loops and Curie temperature up to 80 K. The intrinsic ferromagnetism in graphene and antiferromagnetic exchange coupling between graphene and Ni nano-islands are revealed by x-ray magnetic circular dichroism and density functional theory calculations. The artificial 2D ferromagnets constitute a platform to study the coupling mechanism between complex correlated electronic systems and magnetism on the nanoscale, and the results and concept provide insights into the realization of spin manipulation in quantum computing.

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“…The homogeneity and the compactness of the NNP/GnP film were improved much by reducing the cracks compared to the NNP film. This can be ascribed to the short-range chemical interaction between the d-orbital of Ni in NNP and p-orbital of GnP [ 11 , 50 ], which also induces to increase in the electrical conductivity of the nanohybrid CE. Thus, the overall catalytic performance of the NNP/GnP hybrid CE was much improved compared to its single component-based CEs, consistent with the CV results.…”

Section: Resultsmentioning

confidence: 99%

Low-Cost and Efficient Nickel Nitroprusside/Graphene Nanohybrid Electrocatalysts as Counter Electrodes for Dye-Sensitized Solar Cells

Rahman

2021

Materials

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Novel nickel nitroprusside (NNP) nanoparticles with incorporated graphene nanoplatelets (NNP/GnP) were used for the first time as a low-cost and effective counter electrode (CE) for dye-sensitized solar cells (DSSCs). NNP was synthesized at a low-temperature (25 °C) solution process with suitable purity and crystallinity with a size range from 5 to 10 nm, as confirmed by different spectroscopic and microscopic analyses. The incorporation of an optimized amount of GnP (0.2 wt%) into the NNP significantly improved the electrocatalytic behavior for the redox reaction of iodide (I−)/tri-iodide (I3−) by decreasing the charge-transfer resistance at the CE/electrolyte interface, lower than the NNP- and GnP-CEs, and comparable to the Pt-CE. The NNP/GnP nanohybrid CE when applied in DSSC exhibited a PCE of 6.13% (under one sun illumination conditions) with the Jsc, Voc, and FF of 14.22 mA/cm2, 0.628 V, and 68.68%, respectively, while the PCE of the reference Pt-CE-based DSSC was 6.37% (Jsc = 14.47 mA/cm2, Voc = 0.635 V, and FF = 69.20%). The low cost of the NNP/GnP hybrid CE with comparable photovoltaic performance to Pt-CE can be potentially exploited as a suitable replacement of Pt-CE in DSSCs.

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Characterization of magnetic Ni clusters on graphene scaffold after high vacuum annealing

Cited by 16 publications

References 40 publications

NiNP@rGO Nanocomposites as Heterogeneous Catalysts for Thiocarboxylation Cross-Coupling Reactions

NiNP@rGO Nanocomposites as Heterogeneous Catalysts for Thiocarboxylation Cross-Coupling Reactions

Graphene-mediated ferromagnetic coupling in the nickel nano-islands/graphene hybrid

Low-Cost and Efficient Nickel Nitroprusside/Graphene Nanohybrid Electrocatalysts as Counter Electrodes for Dye-Sensitized Solar Cells

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