Issue 42, 2024

Photo-induced microfluidic production of ultrasmall platinum nanoparticles

Abstract

We describe here the synthesis of ultrasmall Pt nanoparticles (NPs) obtained by a robust and reliable protocol using UV-Vis photoreduction of a platinum salt precursor, under continuous flow conditions. These ligand-free Pt NPs were rapidly dispersed onto a solid support or stabilized towards aggregation as a colloidal solution by the addition of an appropriate ligand in the reaction mixture. The proposed protocol exploits a microfluidic platform where the Pt4+ precursor is photo-reduced to small Pt0 NPs (1.3 nm) at room temperature in the presence of ethanol, without any additional reducing agent. We apply the protocol to prepare Pt NPs highly dispersed on carbon support (Pt/C) proven to be a very efficient heterogeneous catalyst for both the hydrosilylation of terminal alkynes and hydrogenation of nitroaromatic compounds, selected as model reactions. Furthermore, we exploit the versatility of this microfluidic approach to produce stabilized aqueous/ethanol colloidal solutions of Pt NPs, employing a ligand of choice (e.g., PVP or a thiol-ligand). These colloids offer long-term storage and further ligand modification. We showcase the synthesis of biocompatible glycol-stabilized Pt nanoparticles as an exemplary application.

Graphical abstract: Photo-induced microfluidic production of ultrasmall platinum nanoparticles

Supplementary files

Article information

Article type
Communication
Submitted
17 Jul 2024
Accepted
30 Sep 2024
First published
30 Sep 2024
This article is Open Access
Creative Commons BY-NC license

Nanoscale, 2024,16, 19669-19674

Photo-induced microfluidic production of ultrasmall platinum nanoparticles

M. Marelli, P. Perez Schmidt, X. T. Nguyen, E. Pitzalis, L. Poggini, L. Ragona, K. Pagano, L. A. Aronica, L. Polito and C. Evangelisti, Nanoscale, 2024, 16, 19669 DOI: 10.1039/D4NR02971B

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