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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.
Bibliographical noteFunding Information:
We thank the Nanostructural Materials and Processes (NMP) program at the University of Minnesota for financial support. Parts of this work was carried out in the Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program.
© 2019 American Chemical Society.