Gamma irradiation induced synthesis of electromagnetic functionalized aligned CoxNi1−x alloy nanobundles

Abstract

Gamma irradiation induced synthesis of metal or metal oxides has received increasing attention due to its mild reaction conditions. Here, we demonstrate the synthesis of aligned Co_xNi_1−x (x = 0.25, 0.33, 0.5, 0.67, 0.75) alloy nanobundles via a gamma irradiation induced simultaneous reduction of Co²⁺ and Ni²⁺ ions with the assistance of an external magnetic field. The formation of alloy structures was confirmed by element mapping and X-ray absorption studies. Natural ferromagnetic resonance and dielectric loss mainly contribute to the electromagnetic wave absorption of the Co_xNi_1−x alloy materials, and the composition also has great influence. Co₁Ni₂ (x = 0.33) has the strongest absorption of −10.5 dB at 13.6 GHz at a thickness of 2 mm, and the electromagnetic absorption properties can be tuned by the thickness of the Co_xNi_1−x alloys. We believe synthesis of metal alloys through the gamma irradiation induced reduction technique will be appealing to other areas.