Observing Pt nanoparticle formation at the atomic level during polyol synthesis

This study investigated the synthesis of platinum nanoparticles (Pt NPs) in ethylene glycol using low cost and low toxicity chemicals as reducing (ascorbic acid) and stabilizing agents (polyvinylpyrrolidone and sodium citrate). By monitoring the changes in the local chemical environment of the Pt at...

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Bibliographic Details
Published inPhysical chemistry chemical physics : PCCP Vol. 16; no. 33; pp. 1764 - 17647
Main Authors Boita, Jocenir, Nicolao, Lucas, Alves, Maria C. M, Morais, Jonder
Format Journal Article
LanguageEnglish
Published England 07.09.2014
Subjects
Diffusion
Formations
Nanostructure
Platinum
Sodium
Synthesis
Toxicity
X-rays
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Summary:This study investigated the synthesis of platinum nanoparticles (Pt NPs) in ethylene glycol using low cost and low toxicity chemicals as reducing (ascorbic acid) and stabilizing agents (polyvinylpyrrolidone and sodium citrate). By monitoring the changes in the local chemical environment of the Pt atoms in real time by in situ dispersive X-ray absorption spectroscopy, it is observed that the NP formation kinetics involved three different stages within 3 h 30 min of the reaction: a reduction-nucleation burst, followed by diffusion-limited Ostwald ripening growth and subsequent stabilization of the NPs. The resulting Pt NPs were analyzed by transmission electron microscopy and X-ray diffraction, revealing a monodisperse average size distribution of 2.7 ± 0.5 nm, characterized by highly crystalline and stable Pt clusters, showing no significant aging for at least nine months. Monitoring the local chemical environment of the Pt atoms in real time during Pt nanoparticle synthesis by in situ XAS.
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ISSN:1463-9076
1463-9084
DOI:10.1039/c4cp01925c