Engineering gold-platinum core-shell nanoparticles by self-limitation in solution

Marc Ledendecker, Paul Paciok, Wojciech T. Osowiecki, Marc Pander, Marc Heggen, Daniel Göhl, Gaurav A. Kamat, Andreas Erbe, Karl J.J. Mayrhofer, A. Paul Alivisatos

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Core-shell particles with thin noble metal shells represent an attractive material class with potential for various applications ranging from catalysis to biomedical and pharmaceutical applications to optical crystals. The synthesis of well-defined core-shell architectures remains, however, highly challenging. Here, we demonstrate that atomically-thin and homogeneous platinum shells can be grown via a colloidal synthesis method on a variety of gold nanostructures ranging from spherical nanoparticles to nanorods and nanocubes. The synthesis is based on the exchange of low binding citrate ligands on gold, the reduction of platinum and the subsequent kinetically hindered growth by carbon monoxide as strong binding ligand. The prerequisites for homogeneous growth are low core-binding ligands with moderate fast ligand exchange in solution, a mild reducing agent to mitigate homonucleation and a strong affinity of a second ligand system that can bind to the shell’s surface. The simplicity of the described synthetic route can potentially be adapted to various other material libraries to obtain atomically smooth core-shell systems.

Original languageEnglish
Article number71
JournalCommunications Chemistry
Volume5
Issue number1
DOIs
StatePublished - Dec 2022
Externally publishedYes

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