Abstract
Silver nanoparticles (Ag NPs) can serve as seeds in the polyol synthesis of silver nanostructures. However, when heating suspensions of Ag NP seeds up to commonly employed reaction temperatures (e.g., 90 °C or higher for reactions in ethylene glycol), the size distribution of the product Ag NPs can broaden dramatically through a combination of oxidative dissolution, aggregation, and ripening. Results demonstrate that judicious selection of capping agent and pH can protect Ag NP seeds from these reactions, which prevents broadening of the size distribution. Further, polycrystalline seeds can be selectively dissolved, leaving single crystal seeds largely unaltered.
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