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Issue 20, 2014
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Rambutan-like Ni/MWCNT heterostructures: Easy synthesis, formation mechanism, and controlled static magnetic and microwave electromagnetic characteristics

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Abstract

Rambutan-like heterostructures consisting of Ni microspheres coated with oriented multiwall carbon nanotubes (MWCNTs) were synthesized by the one-pot thermal decomposition of a mixture of organic matter and Ni precursors. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy were used to reveal the formation mechanism. The growth of MWCNTs capped by Ni nanoparticles on the surface of the Ni nanoparticle-built microspheres followed a tip-growth mode. The composition and morphology of the rambutan-like heterostructures were easily controlled by changing the reaction time, mass ratio δ of polyethylene glycol (PEG) 20 000 to NiO, as well as type of C source and Ni precursor. Increasing the δ favored not only the increased C mass fraction but also the morphological conversion from Ni/C film core–shell structures to rambutan-like Ni/MWCNT heterostructures. Such changes caused the decreased saturation magnetization and enhanced permittivity properties with δ. Owing to intensive eddy current loss and multiresonance behaviors, rambutan-like Ni/MWCNT heterostructures with long MWCNTs exhibited significantly improved complex permeability and magnetic loss. Ni/MWCNT heterostructures coated by short MWCNTs showed an optimal microwave absorption property with a minimum RL value of −37.9 dB occurring at 12.8 GHz. This work provides effective guidelines for devising and synthesizing highly efficient microwave-absorbing materials.

Graphical abstract: Rambutan-like Ni/MWCNT heterostructures: Easy synthesis, formation mechanism, and controlled static magnetic and microwave electromagnetic characteristics

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Publication details

The article was received on 08 Jan 2014, accepted on 21 Feb 2014 and first published on 21 Feb 2014


Article type: Paper
DOI: 10.1039/C4TA00117F
Citation: J. Mater. Chem. A, 2014,2, 7373-7382
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    Rambutan-like Ni/MWCNT heterostructures: Easy synthesis, formation mechanism, and controlled static magnetic and microwave electromagnetic characteristics

    G. Tong, F. Liu, W. Wu, F. Du and J. Guan, J. Mater. Chem. A, 2014, 2, 7373
    DOI: 10.1039/C4TA00117F

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