Jensen M, Gonano B, Kierulf-Vieira W, Kooyman P J, Sjåstad A O
Center for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo P.O. Box 1033 Blindern N-0315 Oslo Norway
Department of Chemical Engineering, University of Cape Town Private Bag X3, Rondebosch 7701 South Africa.
RSC Adv. 2022 Jul 6;12(31):19717-19725. doi: 10.1039/d2ra03373a.
Precise control of the elemental composition and distribution in bimetallic nanoparticles is of great interest for both fundamental studies and applications, in catalysis. We present a new innovative and facile synthesis strategy for the production of true solid solution Pt Rh 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 Rh solid solution compositions 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.
精确控制双金属纳米颗粒中的元素组成和分布，对于基础研究和催化等应用领域都具有极大的吸引力。我们提出了一种全新的、创新且简便的合成策略，用于制备真正的固溶体PtRh纳米颗粒。这是对已有的加热方法的改进，尽管使用了具有不同反应速率的金属前驱体，但能完全抑制不期望的壳层形成。通过采用多元醇还原法合成选定的PtRh固溶体组成，验证了这一概念。此外，我们还提供了改进的方法，使用相同的表面稳定剂/金属前驱体反应体系，制备出可控的模型Rh（核）-Pt（壳）和Pt（核）-Rh（壳）纳米颗粒。具有相同封端剂的可调双金属固溶体和核壳纳米颗粒，在系统的基础研究中至关重要，因为通过改变表面终止结构可能会改变功能材料的性能。
