Synthesis and magnetic properties of highly arrayed nickel-phosphate nanotubes

Lin, Shih Chin; Chen, San‐Yuan; Cheng, Syh-Yuh; Lin, Jen Chieh

doi:10.1016/j.solidstatesciences.2005.04.001

Cited by 25 publications

(7 citation statements)

References 14 publications

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“…In recent years, with the development of the methods for preparing magnetic nanotubes, the synthesis of tubular nanostructures and the studies on the magnetic properties of nanotubes are pioneered in magnetic nanotechnology. The methods for fabrication include: electroless deposition [6], electrodeposition [7], wetting templates [8][9][10][11][12] and so on. Because of the potential applications demonstrated by previous studies, such as nanomedicine and biotechnology [13], ultrahigh-density magnetic storage devices [14], and nano electromechanical system device [15], magnetic nanotubes have attracted more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Interaction in FeCo Alloy Nanotube Array

Zhou¹,

Wang²,

Zhu³

et al. 2011

Journal of Magnetics

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An array of FeCo nanotubes has been successfully fabricated in the pores of porous anodic aluminum oxide (AAO) templates by wetting templates method. The morphology and structure of the nanotube array were characterized by scanning electron microscopy, transmission electron microscopy and x-ray diffraction. The average diameter of the nanotubes was about 200 nm, and the length was more than 10 µm. Vibrating sample magnetometer and superconducting quantum interference device were used to investigate the magnetic properties of the nanotube array. Interaction between the nanotubes has been found to be demagnetizing as expected and the switching field distribution is broad.

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Section: Introductionmentioning

confidence: 99%

Magnetic Interaction in FeCo Alloy Nanotube Array

Zhou¹,

Wang²,

Zhu³

et al. 2011

Journal of Magnetics

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“…Sn 2+ and Pd 2+ are the common sensitizer and activator, respectively. Using this method, Cu, Co, Ni, and Ni−P , NTs have been synthesized. Similar to the ED method, however, Pd or Sn impurities are inevitably present in the NTs due to the sensitization−activation treatment.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Direct Electrodeposition of Co−Cu Alloy Nanotubes in an Anodic Alumina Template

et al. 2008

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A highly efficient direct electrodeposition method was used to prepare Co-Cu alloy nanotubes in an anodic alumina template without modification. The morphology and structure of as-prepared Co-Cu nanotubes were examined by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The formation mechanism of the tubular nanostructure is discussed. It was found that the template directed electrodeposition of Co-Cu at a large current density can result in the highly efficient growth of nanotubes and that the growth rate as well as the wall thickness of the nanotubes can be controlled via the current density of electrodeposition. Magnetic measurements of the Co-Cu nanotube array show that the nanotubes are ferromagnetic at room temperature and may find potential applications in the fields of biological separation and drug delivery.

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“…In our previous experimental works, the electron-transfer process and pH value were found to be two key factors in the process. , Several experimental observations also remind us that the Ni(II) species may oxidize the hypophosphite anion in bulk solution. For example, in the electroless deposition of nickel, the nanoparticles can be spontaneously generated even in solution, though no substrate is supported. − Moreover, the redox potential of hypophosphite ion is obviously different in acidic and alkaline solutions, according to the diagram of pH versus potential of the P−H 2 O group, as illustrate in eqs 1 and 2 1 Optimized structure and NBO charge distribution of hypophosphite ion (H 2 PO 2 ) and hypophosphorous acid (H 3 PO 2 ) obtained on the B3LYP/6-311G(d,p) level under the polarizable continuum model (PCM) solvent effect model in water solution. …”

Section: Introductionmentioning

confidence: 99%

Electrochemical Impedance Spectroscopy and First-Principle Investigations on the Oxidation Mechanism of Hypophosphite Anion in the Electroless Deposition System of Nickel

Cui

Liu

et al. 2008

J. Phys. Chem. C

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In this work, the oxidation mechanism of hypophosphite anion ( H2PO2 - ) in acidic and alkaline media in the presence of Ni(II) specie was investigated by using electrochemical impedance spectroscopy (EIS) and density functional theory (DFT). In EIS, three major electrochemical processes in the electroless deposition process were found, when the solution pH ranged from 5.5 to 9.5. To understand the microscopic mechanisms involved, all participate species in the reaction pathways were calculated by the DFT method along with a natural bond orbital (NBO) analysis. Two emulating reactions were demonstrated: Path (I) passes through a primary dehydrogenation (D-RP), and Path (II) includes a primary addition of OH- (A-RP) on the hypophosphite anion. By comparison of the energy levels of all species, it can be concluded that Path (II) is energetically favorable under both acidic and alkaline conditions. The DFT and NBO analysis can provide strong evidence for the loops detected in the EIS, especially especially for the inductive loop (IL-M) in the medium-frequency domain that is caused by the formation of [NiI−H3PO2(OH)] and the capacitive loop (CL-L) in the low-frequency domain by [H2PO2(OH)]. The combination of electrochemical analysis (EIS) and first principle theory (DFT) analysis proves that it is helpful to explore the nature of the interaction between anodic and cathodic reactions in the electroless deposition process.

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Synthesis and magnetic properties of highly arrayed nickel-phosphate nanotubes

Cited by 25 publications

References 14 publications

Magnetic Interaction in FeCo Alloy Nanotube Array

Magnetic Interaction in FeCo Alloy Nanotube Array

Highly Efficient Direct Electrodeposition of Co−Cu Alloy Nanotubes in an Anodic Alumina Template

Electrochemical Impedance Spectroscopy and First-Principle Investigations on the Oxidation Mechanism of Hypophosphite Anion in the Electroless Deposition System of Nickel

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