抄録
Ternary nickel-cobalt-phosphorus (Ni-Co-P) hollow microfibers could be prepared by electroless deposition on a hydrogen-bonded supramolecular aggregate as a fibrous template, followed by annealing at 600 °C under an argon atmosphere. Their chemical composition, crystallinity, magnetic property and morphology were characterized. The cobalt content in the hollow microfibers could be tuned simply by a choice of an electroless plating bath, mainly composed of NiSO4 and CoSO4 as metal sources and NaH2PO2 as a reducing reagent and containing different cobalt content expressed as [Co2+]/([Ni2+] + [Co2+]). The Ni-P hollow microfiber without cobalt showed ferromagnetism with a small coercive force, while saturated magnetization, residual magnetization and coercive force of the Ni-Co-P hollow microfibers decreased significantly with an increase of the cobalt content. The increase of the cobalt content induced simultaneously an increase of the phosphorus content. so that crystallization temperature to form a ferromagnetic f.c.c nickel phase was increased and thermal stability of the hollow structure could be improved.
