Using Polyvinylpyrrolidone and Citrate Ions to Modify the Stability of Ag NPs in Ethylene Glycol

Suyue Chen, Hong Bok Lee, Lee Penn

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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.

Original languageEnglish (US)
Pages (from-to)12444-12450
Number of pages7
JournalJournal of Physical Chemistry C
Volume123
Issue number19
DOIs
StatePublished - May 16 2019

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