Surface Design: Exploiting the Instability of Small Nanoparticles on Metallic Substrates

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Thiolated Au nanoparticles have been shown to undergo fast redistribution of the capping layer and subsequently of the metal core, when in contact with bare Au substrates. This is the result of an intricate interplay of entropic and enthalpic factors, which are likely affected by the choice of core metal and capping chemistry. This raises interesting questions, for example whether such a process could be used to modify and functionalize electrode substrates in a well-defined and controlled manner. Here, we report results for Pt and Au nanoparticles on Au and Pt substrates, based on the electrochemical response of the modified electrodes towards the oxidation of glycerol in alkaline media. Our study provides evidence that Pt nanoparticles on Au substrates remain relatively stable, while Au nanoparticles on Pt substrates readily decompose. This is in accordance with initial expectations based on the energetics of the thiol/metal bond.

Original languageEnglish
JournalECS Meeting Abstracts
Publication statusPublished - 1 May 2020

Bibliographical note

Publisher Copyright:
© 2020 ECS - The Electrochemical Society.

ASJC Scopus subject areas

  • General Engineering


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