Silver gold alloys are widely used in a wide variety of applications. They can be plated on various substrates and are also used in high-temperature brazing alloys. The oxidation resistance of these materials is improved when they are alloyed with gold.
Several studies have been conducted to characterize and determine the atomic distribution of these materials. In order to achieve a precise characterization, energy dispersive X-ray spectroscopy (EDX) was employed to examine the crystal structure of the materials. Moreover, Fourier transform infrared spectroscopy was applied to study the functional groups of the PVP.
The morphology and size distribution of the alloy nanoparticles were studied by transmission electron microscopy (TEM). However, the results showed that the synthesized Ag, Au, Ag/Au alloy NPs had no obvious changes in their color within six months. Moreover, the size of the NPs was remarkably uniform.
Optical absorption spectra of the alloy nanoparticles show only one plasmon absorption band. However, the maximum of the plasmon band blue-shifts with increasing silver content. This phenomenon is similar to that observed in pure PVP.
Besides the XPS results, transmission electron microscopy was performed to examine the lattice constants of the samples. In addition, the composition of the bimetallic nanoparticles was determined by EDX.
Among the many factors influencing the ion release of silver, the elemental Ag:Au ratios of the bimetallic nanoparticles were consistent with the feeding solution’s Ag:Au molar ratios. Therefore, these nanocomposites showed promising properties in the study of silver ion release.