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| - Alloy Formation of Gold−Silver Nanoparticles and the Dependence of the PlasmonAbsorption on Their Composition
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| - Gold−silver alloy nanoparticles with varying mole fractions are prepared in aqueous solution by the co-reduction of chlorauric acid HAuCl4 and silver nitrate AgNO3 with sodium citrate. As the optical absorptionspectra of their solutions show only one plasmon absorption it is concluded that mixing of gold and silverleads to a homogeneous formation of alloy nanoparticles. The maximum of the plasmon band blue-shiftslinearly with increasing silver content. This fact cannot be explained by a simple linear combination of thedielectric constants of gold and silver within the Mie theory. On the other hand, the extinction coefficient isfound to decrease exponentially rather than linearly with increasing gold mole fraction xAu. Furthermore, thesize distribution of the alloy nanoparticles is examined using transmission electron microscopy (TEM). High-resolution TEM (HRTEM) also confirms the formation of homogeneous gold−silver alloy nanocrystals.
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