Issue 67, 2018
From the journal:

RSC Advances

Synthesis and biological characterization of alloyed silver–platinum nanoparticles: from compact core–shell nanoparticles to hollow nanoalloys

Viktoria Grasmik,a   Marina Breisch,b   Kateryna Loza,a   Marc Heggen,c   Manfred Köller,b   Christina Sengstockb  and  Matthias Epple ORCID logo *a  

* Corresponding authors

a Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), Universitaetsstr. 5-7, 45117 Essen, Germany
E-mail: matthias.epple@uni-due.de

b Bergmannsheil University Hospital/Surgical Research, Ruhr-University of Bochum, Bürkle-de-la-Camp-Platz 1, 44789 Bochum, Germany

c Ernst Ruska-Center and Peter Gruenberg Institute, Forschungszentrum Juelich GmbH, 52425 Juelich, Germany

Abstract

Bimetallic nanoparticles consisting of silver and platinum were prepared by a modified seeded-growth process in water in the full composition range in steps of 10 mol%. The particles had diameters between 15–25 nm as determined by disc centrifugal sedimentation (DCS) and transmission electron microscopy (TEM). Whereas particles with high platinum content were mostly spherical with a solid silver core/platinum shell structure, mostly hollow alloyed nanoparticles were observed with increasing silver content. The internal structure and the elemental distribution within the particles were elucidated by high-resolution transmission electron microscopy (HRTEM) in combination with energy-dispersive X-ray spectroscopy (EDX). The particles were cytotoxic for human mesenchymal stem cells (hMSC) above 50 mol% silver. This was explained by dissolution experiments where silver was only released at and above 50 mol% silver. In contrast, platinum-rich particles (less than 50 mol% silver) did not release any silver ions. This indicates that the presence of platinum inhibits the oxidative dissolution of silver.

Graphical abstract: Synthesis and biological characterization of alloyed silver–platinum nanoparticles: from compact core–shell nanoparticles to hollow nanoalloys

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Article information

DOI
https://doi.org/10.1039/C8RA06461J
Article type
Paper
Submitted
31 Jul 2018
Accepted
11 Nov 2018
First published
15 Nov 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 38582-38590

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Synthesis and biological characterization of alloyed silver–platinum nanoparticles: from compact core–shell nanoparticles to hollow nanoalloys

V. Grasmik, M. Breisch, K. Loza, M. Heggen, M. Köller, C. Sengstock and M. Epple, RSC Adv., 2018, 8, 38582 DOI: 10.1039/C8RA06461J

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