粒径のそろったPdおよびNi被覆Pdナノ粒子の合成と磁気特性

概要

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Monodispersed Pd nanoparticles with a mean diameter of 25A corresponding to the "magic atom number"of 561 atoms (five-shell nanoparticles) and with mean diameters of less than 25A (22 and 23A) were success-fully synthesized. Two broad absorption peaks corresponding to ΔS = 1 and 2, and a sharp one with ΔS = 1, were observed in the ESR spectra of Pd nanoparticles, which indicates that the five-shell Pd nanoparticles with the magic number have an electron-closed shell, that is, they are in spin-singlet state. Ni ions were reduced to Ni atoms in the presence of Pd nanoparticles, to produce Ni-covered Pd nanoparticles. Their magnetic moment was abnormally increased by increasing the number of Ni atoms covering the Pd nano-particles, as if almost all the atoms consisting of the nanoparticles were Ni atoms.
社団法人日本磁気学会の論文
1997-10-01