Metal nanorod arrays and their magnetic properties

Xue, Shouhong; Wang, Z.D.

doi:10.1016/j.mseb.2006.08.037

Cited by 20 publications

(6 citation statements)

References 9 publications

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“…Among various strategies, structure-directing template synthesis is a simple and versatile method that allows well-defined templates to control the morphology and size of metal nanostructures . Using polymer films as templates, nanostructures of metal nanorods, metal nanotube metal magnetic particle arrays, and porous metal oxide films have been successfully achieved. ,− Because collodion membranes consist of nitrocellulose with a three-dimensional network, they have the capability to incorporate or trap stably several kinds of active materials such as fluorocarbon compounds. Thus, it provides not only a possibility for novel composite membranes but also an opportunity to study the transport mechanism from fundamental standpoint .…”

Section: Introductionmentioning

confidence: 99%

“…For their utility in future applications, the nanostructure and morphology of multimetallic materials become the important characteristics. Two-dimensional (2D) and one-dimensional (1D) metal nanostructures, such as nanosheet, nanomesh, nanonetwork, nanorings, nanochains, and nanorods, have received alot of attention in recent years because they can give rise to unique potential applications. Among various strategies, structure-directing template synthesis is a simple and versatile method that allows well-defined templates to control the morphology and size of metal nanostructures .…”

Section: Introductionmentioning

confidence: 99%

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Nanostructures of Ni and NiCo Amorphous Alloys Synthesized by a Double Composite Template Approach

et al. 2009

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Two-dimensional handkerchief-like nanostructures of Ni and NiCo magnetic amorphous alloys have been synthesized by a double composite structure-inducing template. High resolution transmission electron microscopy was used to characterize the morphology and the dimensions. The self-assembly of fine handkerchief-like Ni and NiCo nanoalloys is attributed to the cooperation between ion-selected delivery of a hard collodion membrane by nitro-group chemical complexations and the size-controlled action of a reverse microemulsion. Importantly, the coordinations of ethylenediamine with Ni 2+ and Co 2+ can restrict the structureinducing action. The phase transformation behavior was recorded by differential scanning calorimetry. Substituting Co for Ni can slow phase transformation, and the kinetic ordering temperature increases with the Co concentration increasing. The magnetic property measurement results show that the saturation magnetizations increase as the Co concentration is increased, but the coercivity is not sensitive to the Co concentration and is decided only by the phase structure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanostructures of Ni and NiCo Amorphous Alloys Synthesized by a Double Composite Template Approach

et al. 2009

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“…Nickel nanorods were made inside multiwalled carbon nanotubes (MWCNTs) or carbon nanofibers using microwave plasma chemical vapor deposition (MPCVD) , or plasma-enhanced chemical vapor deposition (PECVD), respectively. Arrays of ferromagnetic nickel nanowires and nickel nanorods have been synthesized by electrochemical deposition using polycarbonate membranes. − Nickel nanorods were also prepared within the channels of block copolymers or by annealing of dense composite films of NiO under H 2 . Unfortunately, these syntheses use expensive precursors and reagents and/or suffer from limited control over the final nanostructure morphology.…”

Section: Introductionmentioning

confidence: 99%

Templated Synthesis and Chemical Behavior of Nickel Nanoparticles within High Aspect Ratio Silica Capsules

et al. 2013

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One-dimensional transition metal nanostructures are of interest in many magnetic and catalytic applications. Using a combination of wet chemical synthesis, optical (infrared), and structural characterization methods (powder X-ray diffraction, scanning and transmission electron microscopy), we have investigated four paths to access 1D nickel nanostructures: (1) direct chemical reduction of a self-assembled nickel-hydrazine coordination complex, (2) thermal decomposition of the silica encapsulated nickel-hydrazine complex, (3) treatment of the silica encapsulated nickel-hydrazine complex with sodium borohydride followed by thermal annealing, and (4) electroless nickel plating using silica encapsulated nickel seed particles. We find that only route 1, which does not require a silica template, results in the formation of nickel nanorods, albeit some particle aggregation is observed. Routes 2 and 3 result in the formation of isotropic nickel structures under a reducing atmosphere. Route 4 results in heterogeneous nucleation and growth of existing particles only when partial etching of the silica capsule occurs. Detailed examination of the encapsulated nickel particles allows studying the effect of silica surface silanols on the oxidation of encapsulated nickel particles, the presence of nanoparticle-silica support interactions, the sintering mechanism of nickel and nickel oxide particles, and the fate of boride impurities. Nickel/silica nanostructures are strongly magnetic at room temperature. (infrared), and structural characterization methods (powder X-ray diffraction, scanning and transmission electron microscopy), we have investigated four paths to access 1D nickel nanostructures: (1) direct chemical reduction of a self-assembled nickel−hydrazine coordination complex, (2) thermal decomposition of the silica encapsulated nickel−hydrazine complex, (3) treatment of the silica encapsulated nickel−hydrazine complex with sodium borohydride followed by thermal annealing, and (4) electroless nickel plating using silica encapsulated nickel seed particles. We find that only route 1, which does not require a silica template, results in the formation of nickel nanorods, albeit some particle aggregation is observed. Routes 2 and 3 result in the formation of isotropic nickel structures under a reducing atmosphere. Route 4 results in heterogeneous nucleation and growth of existing particles only when partial etching of the silica capsule occurs. Detailed examination of the encapsulated nickel particles allows studying the effect of silica surface silanols on the oxidation of encapsulated nickel particles, the presence of nanoparticle−silica support interactions, the sintering mechanism of nickel and nickel oxide particles, and the fate of boride impurities. Nickel/silica nanostructures are strongly magnetic at room temperature.

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“…The wire-grid polarizer also belongs to the reflective polarizer and finds its use frequently in micro-wave applications. As nanofabrication technology has advanced, the wire-grid polarizer in optical wavelength was also developed and studied recently [4][5][6]. Most wire-grid polarizers take advantage of the boundary conditions imposed by metallic nanowire [7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Reflective Polarizer Based on Dielectric Nanofibers

2012

Molecular Crystals and Liquid Crystals

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Numerical calculations were carried out to find the mechanisms of a nanofiber based reflective polarization sheet (RPS) using the finite-difference time-domain (FDTD) method. The simulation showed that the birefringence of nanofiber layers can make a reflective polarizer with small energy loss. In addition, the simulation demonstrated that the diameter of nanofibers and the spacing between them affected the extinction coefficient of RPS depending on its polarization. According to the calculations with various diameters of the nanofiber, there exists an optimum diameter of the nanofibers for maximum extinction coefficient.

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Metal nanorod arrays and their magnetic properties

Cited by 20 publications

References 9 publications

Nanostructures of Ni and NiCo Amorphous Alloys Synthesized by a Double Composite Template Approach

Nanostructures of Ni and NiCo Amorphous Alloys Synthesized by a Double Composite Template Approach

Templated Synthesis and Chemical Behavior of Nickel Nanoparticles within High Aspect Ratio Silica Capsules

Analysis of the Reflective Polarizer Based on Dielectric Nanofibers

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