Surfactant-Free Colloidal Syntheses of Gold-Based Nanomaterials in Alkaline Water and Mono-alcohol Mixtures

Jonathan Quinson*, Olivia Aalling-Frederiksen, Waynah L Dacayan, Joachim D Bjerregaard, Kim D. Jensen, Mads R V Jørgensen, Innokenty Kantor, Daniel R Sørensen, Luise Theil Kuhn, Matthew S Johnson, María Escudero-Escribano, Søren B Simonsen, Kirsten M Ø Jensen*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Gold nanoparticles (Au NPs) and gold-based nanomaterials combine unique properties relevant for medicine, imaging, optics, sensing, catalysis, and energy conversion. While the Turkevich-Frens and Brust-Schiffrin methods remain the state-of-the-art colloidal syntheses of Au NPs, there is a need for more sustainable and tractable synthetic strategies leading to new model systems. In particular, stabilizers are almost systematically used in colloidal syntheses, but they can be detrimental for fundamental and applied studies. Here, a surfactant-free synthesis of size-controlled colloidal Au NPs stable for months is achieved by the simple reduction of HAuCl4 at room temperature in alkaline solutions of low-viscosity mono-alcohols such as ethanol or methanol and water, without the need for any other additives. Palladium (Pd) and bimetallic Au x Pd y NPs, nanocomposites and multimetallic samples, are also obtained and are readily active (electro)catalysts. The multiple benefits over the state-of-the-art syntheses that this simple synthesis bears for fundamental and applied research are highlighted.

Original languageEnglish
JournalChemistry of Materials
Volume35
Issue5
Pages (from-to)2173-2190
Number of pages18
ISSN0897-4756
DOIs
Publication statusPublished - Mar 2023

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