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We obtained sphere-like nanoparticles Ni/Au with a core-shell structure. They are variable in size (7–14 nm of Ni nuclei) and have a narrow-size particle distribution. It was done by means of stepwise (sequential) reduction of the calibrated portions of tetrahydroborate sodium and nickel sulfate solutions. It was done under the presence of sodium citrate as a stabilizer and the combination with a...