Synthesis of High-Aspect-Ratio Nickel Nanowires by Dropping Method

Zhang, Jiaqi; Xiang, Wenfeng; Liu, Yuan; Hu, Minghao; Zhao, Kun

doi:10.1186/s11671-016-1330-z

Cited by 30 publications

(31 citation statements)

References 14 publications

(14 reference statements)

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“…Their magnetic properties were evaluated using a superconducting quantum interference device (SQUID, Quantum Design, Tokyo, Japan), which was operated at 300 K. Magnetization was measured as a function of the applied field from 0 to 50 kOe. [35,51,52], the assembled wires in this study were not single MNP chains and contained many MNPs in the cross-section of every single wire. Thus, the average diameter of the wires was larger than that of the composite MNPs.…”

Section: Characterizationmentioning

confidence: 97%

“…The assembly method commonly involves the cooperative combination of the EMF and a polymer, responsible for the self-assembly process of magnetic nanoparticles (MNPs) and gluing together the aligned nanoparticles, respectively [5]. EMF-assisted self-assembly of wire structures from MNPs is a simple, low-cost and environmentally friendly method, feasible for application in large-scale production [1,19,[34][35][36][37]. The self-assembly is directed by an EMF via controlling the magnetic dipole-dipole interaction between MNPs [37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced magnetic performance of aligned wires assembled from nanoparticles: from nanoscale to macroscale

Kartikowati

Iwaki

et al. 2020

R. Soc. open sci.

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Magnetic wires in highly dense arrays, possessing unique magnetic properties, are eagerly anticipated for inexpensive and scalable fabrication technologies. This study reports a facile method to fabricate arrays of magnetic wires directly assembled from well-dispersed α ″ -Fe 16 N 2 /Al 2 O 3 and Fe 3 O 4 nanoparticles with average diameters of 45 nm and 65 nm, respectively. The magnetic arrays with a height scale of the order of 10 mm were formed on substrate surfaces, which were perpendicular to an applied magnetic field of 15 T. The applied magnetic field aligned the easy axis of the magnetic nanoparticles (MNPs) and resulted in a significant enhancement of the magnetic performance. Hysteresis curves reveal that values of magnetic coercivity and remanent magnetization in the preferred magnetization direction are both higher than that of the nanoparticles, while these values in the perpendicular direction are both lower. Enhancement in the magnetic property for arrays made from spindle-shape α ″ -Fe 16 N 2 /Al 2 O 3 nanoparticles is higher than that made from cube-like α ″ -Fe 16 N 2 /Al 2 O 3 ones, owing to the shape anisotropy of MNPs. Furthermore, the assembled highly magnetic α ″ -Fe 16 N 2 /Al 2 O 3 arrays produced a detectable magnetic field with an intensity of approximately 0.2 T. Although high-intensity external field benefits for the fabrication of magnetic arrays, the newly developed technique provides an environmentally friendly and feasible approach to fabricate magnetic wires in highly dense arrays in open environment condition.

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Section: Characterizationmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Enhanced magnetic performance of aligned wires assembled from nanoparticles: from nanoscale to macroscale

Kartikowati

Iwaki

et al. 2020

R. Soc. open sci.

View full text Add to dashboard Cite

show abstract

“…We decided to adapt and tune the parameters of the published technique, in which water was essentially eliminated (except for the N 2 H 4 solvation water) and ethylene glycol was used instead as the reaction medium [26,28]. This approach afforded NiNWs, which more readily aligned in the magnetic field (compared to products prepared by the previous method) and no signs of adulteration were observed.…”

Section: Mechanism and Methodology Of Ninw Synthesismentioning

confidence: 99%

Nickel Nanowires: Synthesis, Characterization and Application as Effective Catalysts for the Reduction of Nitroarenes

et al. 2018

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We have demonstrated a convenient method of synthesizing nickel nanowires (NiNWs), which could be easily tuned to produce materials with a carefully defined nanostructure. By varying the concentration of the Ni precursor, pH of the medium or reaction temperature, we directly affected the diameter of the formed product as well as the yield of the process. The obtained material consisted of straight bundles of NiNWs, which revealed powerful catalytic action for the reduction of nitroarenes to appropriate amine derivatives. A selection of substrates were employed and all of them were successfully converted into the corresponding aromatic amine despite the presence of different substituents on the aromatic ring with high yields, even in large scale reactions. The results showed that NiNW-based catalysts could constitute efficient catalytic systems for the synthesis of aryl amines at industrial levels.

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“…Four SERS‐active substrates including Ag, Au, Ni, and Co NPs were synthesized according to the literature, and the synthetic procedures are described in the Experimental Section. Most of the Ag NPs were spheroid‐like with an average diameter of 60 nm, whereas the spheroidal Au NPs were more uniform, with an average diameter of 20 nm (Figure S1 in the Supporting Information).…”

Section: Methodsmentioning

confidence: 99%

Electron Transfer of Cytochrome c on Surface‐Enhanced Raman Scattering–Active Substrates: Material Dependence and Biocompatibility

Cheng

Wang

et al. 2017

Chemistry A European J

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Surface-enhanced Raman spectroscopy (SERS) represents a powerful approach for studying the structure and reaction of proteins in fundamental and applied sciences. The surface properties of SERS-active materials determine important parameters such as Raman enhancement ability, biocompatibility, and electronic communication between supports and proteins. Here, electron transfer (ET) of Cyt c on noble metals and transition metals is investigated by SERS spectroscopy. The results here indicate that the ET occurs from the reduced state of Cyt c to silver substrate, depending on the laser wavelengths. Nickel and cobalt can directly transfer electrons to the oxidized state of Cyt c, which enables a reductive activity of these transition metal nanoparticles (NPs). This study demonstrates the role of transition metals as electron donors for Cyt c and has proved that the charge transfer theory for SERS is applicable for explanation of the ET between Cyt c and Ag NPs.

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Synthesis of High-Aspect-Ratio Nickel Nanowires by Dropping Method

Cited by 30 publications

References 14 publications

Enhanced magnetic performance of aligned wires assembled from nanoparticles: from nanoscale to macroscale

Enhanced magnetic performance of aligned wires assembled from nanoparticles: from nanoscale to macroscale

Nickel Nanowires: Synthesis, Characterization and Application as Effective Catalysts for the Reduction of Nitroarenes

Electron Transfer of Cytochrome c on Surface‐Enhanced Raman Scattering–Active Substrates: Material Dependence and Biocompatibility

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