Issue 33, 2014
From the journal:

Physical Chemistry Chemical Physics

Observing Pt nanoparticle formation at the atomic level during polyol synthesis

Jocenir Boita,a   Lucas Nicolao,a   Maria C. M. Alvesb  and  Jonder Morais*a  

* Corresponding authors

a Laboratório de Espectroscopia de Elétrons (LEe−), Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Avenida Bento Gonçalves, 9500, Bairro Agronomia, CP 15051, CEP 91501-970, Porto Alegre, RS, Brazil
E-mail: jonder@if.ufrgs.br
Tel: +55 51 33086525

b Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), Avenida Bento Gonçalves, 9500, Bairro Agronomia, CP 15003, CEP 91501-970, Porto Alegre, RS, Brazil

Abstract

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.

Graphical abstract: Observing Pt nanoparticle formation at the atomic level during polyol synthesis

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Article information

DOI
https://doi.org/10.1039/C4CP01925C
Article type
Paper
Submitted
05 May 2014
Accepted
07 Jul 2014
First published
10 Jul 2014

Phys. Chem. Chem. Phys., 2014,16, 17640-17647

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Observing Pt nanoparticle formation at the atomic level during polyol synthesis

J. Boita, L. Nicolao, M. C. M. Alves and J. Morais, Phys. Chem. Chem. Phys., 2014, 16, 17640 DOI: 10.1039/C4CP01925C

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