A facile route to carbon-coated nickel-based metal nanoparticles

Ni/Ni3C Core–Shell Nanochains and Its Magnetic Properties: One-Step Synthesis at Low Temperature

“…35 Recently, mild chemical solution methods have been applied to synthesize nanosized nickel carbide. For example, Leng et al prepared pure Ni 3 C nanoparticles by thermal decomposition in solution at 529 K. 36 However, most Ni-based nanomaterials with the core-shell structure were reported with Ni/C 37,38,39 or Ni 3 C/C 39,40 nanoparticles. To our best knowledge, the core-shell Ni/Ni 3 C nanochain structure has never been reported before.…”

Ag3PO4 nanoparticle-decorated Ni/C nanocapsules with tunable electromagnetic absorption properties

“…Ag 3 PO 4, which has complex and rich electronic transport properties with a wide bandgap of 2.45 eV, is regarded as a simple and important type of photocatalytic semiconductor materials. 2 It was recently reported to possess a high relative permittivity of ∼20 in the 100 Hz-10 MHz range at room temperature due to the existence of a strong space charge polarization. 3 By introducing controlled amounts of Ag 3 PO 4 nanoparticles onto/into the Ni/C nanocapsules, it is likely to tune/fine-tune their EM absorption properties and to realize tunable EM absorbers.…”

“…[1][2][3][4][5][6][7] Among various types of core/shell-structured nanocapsules, nickel/carbon (Ni/C) nanocapsules are regarded as a highpotential candidate due to their simple material type, simple preparation process, interesting dielectric and magnetic properties, good EM impedance match, and high EM absorption properties, etc. 1,2,6 For instance, a Ni/C nanocapsule absorber with 2.0 mm thickness exhibits a large reflection loss (RL) of ∼-32 dB at ∼13 GHz and a wide effective absorption bandwidth (for RL<-10 dB) of ∼4.3 GHz (i.e.,11.2-15.5 GHz). 6 However, the major obstacle to widespread use of the core/shell-structured nanocapsules in EM absorbers is their almost untunable EM absorption properties constrained by the a Author to whom correspondence should be addressed.…”

“…1 High-performance EM absorbers, featuring simultaneously strong absorption, wide absorption bandwidth, small thickness, and low density in the gigahertz microwave range, have become increasingly important and demanding. [2][3][4] Core/shell-structured nanocapsules, comprising a magnetic nanoparticle core and a dielectric shell of nanometer size, have attracted considerable attention because of their synergetic effects between dielectric and magnetic losses for absorbing EM waves. [1][2][3][4][5][6][7] Among various types of core/shell-structured nanocapsules, nickel/carbon (Ni/C) nanocapsules are regarded as a highpotential candidate due to their simple material type, simple preparation process, interesting dielectric and magnetic properties, good EM impedance match, and high EM absorption properties, etc.…”

“…[2][3][4] Core/shell-structured nanocapsules, comprising a magnetic nanoparticle core and a dielectric shell of nanometer size, have attracted considerable attention because of their synergetic effects between dielectric and magnetic losses for absorbing EM waves. [1][2][3][4][5][6][7] Among various types of core/shell-structured nanocapsules, nickel/carbon (Ni/C) nanocapsules are regarded as a highpotential candidate due to their simple material type, simple preparation process, interesting dielectric and magnetic properties, good EM impedance match, and high EM absorption properties, etc. 1,2,6 For instance, a Ni/C nanocapsule absorber with 2.0 mm thickness exhibits a large reflection loss (RL) of ∼-32 dB at ∼13 GHz and a wide effective absorption bandwidth (for RL<-10 dB) of ∼4.3 GHz (i.e.,11.2-15.5 GHz).…”