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Microporous Ni@NiO nanoparticles prepared by chemically dealloying Al 3 Ni 2 @Al nanoparticles as a high microwave absorption material

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Abstract The Al 3 Ni 2 @Al nanoparticles (NPs) were prepared from Ni 45 Al 55 master alloy by hydrogen plasma-metal reaction method, and were subsequently dealloyed to produce porous… Click to show full abstract

Abstract The Al 3 Ni 2 @Al nanoparticles (NPs) were prepared from Ni 45 Al 55 master alloy by hydrogen plasma-metal reaction method, and were subsequently dealloyed to produce porous Ni@NiO NPs of 36 nm. The pore size ranges from 0.7 to 1.6 nm, leading to large specific surface area of 69.5 m 2 /g and big pore volume of 0.507 cc/g. The saturation magnetization ( M S ) and coercivity ( H C ) of the microporous Ni@NiO NPs are 11.5 emu/g and 5.2 Oe. They exhibit high microwave absorption performance with a minimum reflection coefficient (RC) of −86.9 dB and an absorption bandwidth of 2.6 GHz (RC≤−10 dB) at thickness of 4.5 mm. The enhanced microwave absorption properties are attributed to the synergistic effect of the magnetic Ni core and dielectric NiO shell, and the micropore architecture. The NPs with micropore morphology and core/shell structure open a new way to modify the microwave absorption performance.

Keywords: absorption; microwave absorption; microporous nio; nio nanoparticles; high microwave; nanoparticles prepared

Journal Title: Journal of Magnetism and Magnetic Materials
Year Published: 2017

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