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Illustration of the coating process; (A) Au(CH3COO-)3 is reduced by 1,2- hexadecanediol in the presence of oleic acid and oleylamine at a temperature of 180–190 °C, (B) thermally active partial desorption of the capping layer occurs, (C) the reduction of Au(CH3COO-)3 results in deposition of Au on the surface of the exposed surface of the magnetic nanoparticles, and (D) the re-encapsulation of the Au shell with oleylamine and oleic acid.
