Abstract
The low-temperature alloying of Fe-Ag nanoparticlesentrapped within thermally evaporated fatty acid films by anovel ion exchange technique is described. Nanoparticles ofiron and silver were grown in thermally evaporated stearic acid (StA)films by sequential immersion of the film in solutionscontaining Fe2+ ions and Ag+ ions followed by their in situ reduction at each stage. Entrapment of Fe2+and Ag+ ions in the StA film occurs byselective electrostatic binding with the carboxylate ions inthe fatty acid matrix. Thereafter, the metal ions were reducedin situ to yield nanoparticles of Fe and Ag of ca. 35 nmdiameter within the fatty acid matrix. Thermal treatment of theStA-(Fe + Ag) nanocomposite film at 200 °C resulted inthe formation of an Fe-Ag alloy. Prolonged heat treatment at250 °C resulted in the phase separation of the alloy andthe re-formation of individual Fe and Ag nanoparticles. Theprocess of Fe2+ and Ag+ ion incorporation in the StAmatrix and synthesis of the Fe-Ag alloy were followed by quartzcrystal microgravimetry, Fourier transform infraredspectroscopy, transmission electron microscopy andx-ray diffraction measurements.
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