The effect of a gas atmosphere on the formation of colloidal platinum nanoparticles in liquid phase synthesis

• Published in: Colloid and polymer science 2023-05, Vol.301 (5), p.433-443
• Main Authors: Danilenko, M. V., Guterman, V. E., Novomlinskiy, I. N., Pankov, I. V.
• Format: Article
• Language: English
• Subjects: Acids; Argon; Carbon; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Food Science; Formic acid; Gases; Liquid phases; Methods; Morphology; Nanomaterials; Nanoparticles; Nanotechnology and Microengineering; Original Contribution; Physical Chemistry; Platinum; Polymer Sciences; Soft and Granular Matter; Spatial distribution; Synthesis
• ISSN: 0303-402X; 1435-1536
• DOI: 10.1007/s00396-023-05077-2

This article demonstrates how purging the reaction medium with argon, oxygen, or CO during the liquid-phase synthesis affects the transformation dynamics of the Pt(IV) into Pt(0) x as well as the morphology of the Pt/C obtained. The reaction media studied are typical for the polyol and formic acid synthesis methods. The real-time monitoring of the Pt(0) x formation in these systems has been studied by the potentiometric and colorimetric measurements. The nature of a gas has been shown to affect the size of the small Pt particles formed as well as their different spatial distribution over the carbon support surface. Therefore, a gas is supposed to provide an additional control over both the formation of colloidal Pt and the microstructure of the Pt/C obtained. Moreover, this study illustrates a novel approach to using a platinum indicator electrode for the estimation of the reaction system’s redox state during the synthesis of Pt nanoparticles. Graphical Abstract