The Fabrication and Magnetic Properties of Ni Fibers Synthesized Under External Magnetic Fields

Gong, Chunhong; Yu, Laigui; Duan, Yuping; Tian, Juntao; Wu, Zhishen; Zhang, Zhijun

doi:10.1002/ejic.200800200

Cited by 30 publications

(19 citation statements)

References 36 publications

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“…It is also worth mentioning here that it is possible to synthesize single crystalline nanostructures using template method by proper and tight control of the process parameters [23]. There also have been attempts to improve and obtain highly aligned 1D nanostructures by applying external magnetic field during the synthesis [24,25]. To date, many synthesis and characterization methods have been developed and employed to help us synthesize and characterize 1D nanostructures, but due to the nature of the formed nanostructures which exhibit different behavior at different conditions (environmental and synthesis), a full knowledge of these 1D nanostructures and the influence of synthesis parameters are still in their early stages.…”

Section: Introductionmentioning

confidence: 99%

Effect of Current Density and Magnetic Field on the Growth and Morphology of Nickel Nanowires

Samykano

Mohan

Aravamudhan

2014

MEMS and Nanotechnology, Volume 8

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One-dimensional nanostructures due to their unique properties and applications have generated special interests in MEMS and NEMS applications. There have been numerous methods developed to synthesize such 1D nanostructures. One of the most prominent methods is the electrodeposition into the channels in a porous material. It has been found that applied external magnetic field could improve and direct the growth of one-dimensional nanostructures in certain crystallographic directions. However, the nature and behavior of such structures and the influence of the synthesis parameters are yet to be fully understood. Our present work investigates the effect of the current density along with external magnetic field intensity on the growth direction of the one-dimensional Nickel nanowires. In the present study, Ni nanowires are grown using the electrodeposition assisted anodic alumina template method. The grown nanowires are characterized using XRD to determine the crystallographic properties. SEM was then used to characterize the morphology of the grown structures, while EDS was employed to study the composition. Present results clearly indicate that the morphological and crystallographic properties of synthesized nanowires are influenced by the applied current density and magnetic field intensity. Further studies employing Focused Ion Beam to prepare TEM sample are required to investigate the atomic arrangement of the synthesized Ni nanowires to further conform the present SEM and XRD findings. Keywords Nickel nanowires • Template based synthesis • Magnetic field • X-ray diffraction and electrodeposition IntroductionIn the past two decades, 1D nanostructures have received serious attention in NEMS/MEMS and nanotechnology applications. Researchers have studied numerous methods to synthesize 1D nanostructures with different shapes, morphology, size and materials resulting in exciting and fundamentally different configurations [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. So far, there are two major approaches in synthesizing the 1D nanostructures, which are known as "bottom-up" and "top down" approach. In "bottom up" approach, the formation of 1D nanostructure is through crystallization, where the evolution of a solid from a vapor, liquid or solid phase involves two fundamental steps of nucleation and growth. As the concentration of the building units (atoms, ions or molecules) of a solid becomes sufficiently high, they aggregate into small nuclei or clusters through homogeneous nucleation. Thus, with a continuous supply of the building blocks, these nuclei will serve as seeds for further growth to form larger structures. In comparison, in "top down approach", the formation of the 1D nanostructure is from the attrition of the bulk material to nanometer sized 1D nanostructures using techniques such as lithography [16], focused ion beam [17] and electrospinning [18].

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Section: Introductionmentioning

confidence: 99%

Effect of Current Density and Magnetic Field on the Growth and Morphology of Nickel Nanowires

Samykano

Mohan

Aravamudhan

2014

MEMS and Nanotechnology, Volume 8

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“…In order to control the properties of the electrodeposit, it is important to understand the effect of external magnetic field during the electrochemical processes. In previous works, external magnetic fields have been applied during the synthesis process to control structural and magnetic properties of 1D nanostructures [21,22]. It has been observed that external magnetic field can induce changes in surface morphology and preferential growth direction in case of Ni or Ni-Fe grains [21,27].…”

Section: Introductionmentioning

confidence: 99%

“…To date, a number of synthesis and characterization methods have been employed to study Ni nanowires. Specifically, the effect of electrodeposition process parameters such as solution pH, bath temperatures, current and additives on the growth and morphology of the Ni nanowires has been investigated [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Morphology and Crystallographic Characterization of Nickel Nanowires—Influence of Magnetic Field and Current Density During Synthesis

Samykano

Mohan

Aravamudhan

2014

Journal of Nanotechnology in Engineering and Medicine

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This paper presents results and discussion from a comprehensive morphological and crystallographic characterization of nickel nanowires synthesized by template-based electrodeposition method. In particular, the influence of magnetic and electric field (current density) conditions during the synthesis of nickel nanowires was studied. The structure and morphology of the synthesized nanowires were studied using Helium ion microscopy (HIM) and scanning electron microscopy (SEM) methods. The HIM provided higher quality data and resolution compared to conventional SEM imaging. The crystallographic properties of the grown nanowires were also studied using X-ray diffraction (XRD). The results clearly indicated that the morphological and crystallographic properties of synthesized nickel nanowires were strongly influenced by the applied magnetic field and current density intensity during the synthesis process.

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“…The above research mainly focused on the hydrothermal or chemical reduction method to prepare nickel materials. In addition, magnetic‐field‐induced assembly method was also widely applied in the synthesis of variously shaped nickel crystals . For example, 1D nickel wires were obtained via the magnetic‐field‐dependent synthesis .…”

Section: Introductionmentioning

confidence: 99%

“…For example, 1D nickel wires were obtained via the magnetic‐field‐dependent synthesis . The preparation of nickel materials with other morphologies (such as Ni fibers) was also reported . The above referred synthesis of nickel crystal was almost performed at above RT by the aid of heating, which was in the need of energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Room‐Temperature Morphology‐Controlled Synthesis of Nickel and Catalytic Properties of Corresponding Ru/Ni Catalysts

et al. 2019

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Differently shaped nickel crystals were obtained at ambient temperature via simple liquid chemical reduction by adding different surfactants (such as polyvinylpyrrolidone (PVP) or cetyltrimethylammonium bromide (CTAB)), with hydrazine hydrate as reducing agent and ethanol as solvent. Nickel nanoparticles (NPs), thorny nickel nanowires or rose‐like nickel crystals were obtained in the synthesis process without any surfactant, with PVP or with CTAB, respectively. The corresponding ruthenium‐on‐Ni crystal supported catalysts (Ru/Ni) were synthesized through galvanic replacement. Their catalytic behavior was tested in the model reaction of the hydrogenation of benzene. The order of their catalytic activity was Ru/thorny Ni nanowire > Ru/rose‐like Ni > Ru/Ni NPs due to different shapes and structures of Ru/Ni. The Ru/thorny Ni nanowires catalyst also exhibited outstanding stability for benzene hydrogenation to cyclohexane. The as‐obtained Ni and Ru/Ni samples were characterized by X‐ray diffraction (XRD), scanning electronic microscopy (SEM), SEM energy dispersive X‐ray spectroscopy (SEM‐EDS), high‐sensitivity low‐energy ion scattering spectroscopy (HS‐LEIS), X‐ray photoelectron spectroscopy (XPS), SEM‐EDS elemental mapping, transmission electron micro‐scope (TEM), and high resolution TEM (HRTEM), to reveal their morphologies, structures and element distribution and further illustrate the intrinsic reasons for their different performance in catalyzing benzene hydrogenation.

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The Fabrication and Magnetic Properties of Ni Fibers Synthesized Under External Magnetic Fields

Cited by 30 publications

References 36 publications

Effect of Current Density and Magnetic Field on the Growth and Morphology of Nickel Nanowires

Effect of Current Density and Magnetic Field on the Growth and Morphology of Nickel Nanowires

Morphology and Crystallographic Characterization of Nickel Nanowires—Influence of Magnetic Field and Current Density During Synthesis

Room‐Temperature Morphology‐Controlled Synthesis of Nickel and Catalytic Properties of Corresponding Ru/Ni Catalysts

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