Nickel/Nickel Phosphide Core−Shell Structured Nanoparticles: Synthesis, Chemical, and Magnetic Architecture

Discrete, magnetically recyclable, and oxidation-resistant nanoparticles with nickel/nickel phosphide core−shell structure were synthesized through surface-phosphatizing Ni nanoparticles using triphenylphosphine as the phosphorus source. The Ni 2 P shell thickness was tunable by changing the reaction time in the mild temperature organic solution. And it was shown that the chemical architecture of core−shell can be useful to prepare Ni 3 P nanogranular films through the chemical combination of Ni 2 P shell with inner Ni during annealing. The core−shell magnetic architecture can also be helpful in improving the magnetically thermal stability through the effective influence of surface anisotropy after magnetic surface modification. The mechanism could be used to guide the synthesis and application of similar core−shell structured nanomaterials.