Abstract
Ultrafine Ag/Co nano-alloys have been prepared successfully using silver(I)-bis(oxalato)cobaltat(II) complex and 1,3-diaminopropane (DAP), which is a typical phase-separation system in a bulk phase diagram, in diethyl ether/aqueous solution. The product's morphology depends on the pH of the reaction solution. The use of an oxalate complex, in which two metal ions exist in one complex, is found to be effective in preventing unfavorable silver halide formation and thus is suitable for the formation of Ag/Co bimetallic nanoparticles. The crystal structure and lattice constant of the Ag/Co nano-alloys obtained were investigated by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission-electron microscopy (TEM), and UV-vis spectroscopy. These results show that DAP plays a key role in the determination of particle morphology. The results in the present study demonstrated the differences on alloying behavior between bulk and nanoscopic materials.
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