Innovative approach to controlled Pt-Rh bimetallic nanoparticle synthesis

M Jensen; B Gonano; W Kierulf-Vieira; P J Kooyman; A O Sjåstad

doi:10.1039/d2ra03373a

Innovative approach to controlled Pt-Rh bimetallic nanoparticle synthesis

RSC Adv. 2022 Jul 6;12(31):19717-19725. doi: 10.1039/d2ra03373a.

Authors

M Jensen¹, B Gonano¹, W Kierulf-Vieira¹, P J Kooyman², A O Sjåstad¹

Affiliations

¹ Center for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo P.O. Box 1033 Blindern N-0315 Oslo Norway a.o.sjastad@kjemi.uio.no martin.jensen@kjemi.uio.no.
² Department of Chemical Engineering, University of Cape Town Private Bag X3, Rondebosch 7701 South Africa.

Abstract

Precise control of the elemental composition and distribution in bimetallic nanoparticles is of great interest for both fundamental studies and applications, e.g. in catalysis. We present a new innovative and facile synthesis strategy for the production of true solid solution Pt_1-x Rh _x nanoparticles. This constitutes a development of the established heat-up method, where undesired shell formation is fully suppressed, despite utilizing metal precursors with different reaction rates. The concept is demonstrated through synthesis of selected Pt_1-x Rh _x solid solution compositions via the polyalcohol reduction approach. In addition, we provide modified procedures, using the same surface stabilizing agent/metal precursors reaction matrix yielding controlled model Rh(core)-Pt(shell) and Pt(core)-Rh(shell) nanoparticles. Tunable bimetallic solid solution and core-shell nanoparticles with the same capping agent are of key importance in systematic fundamental studies, as functional materials properties may be altered by modifying the surface termination.