DOI: https://doi.org/10.29363/nanoge.incnc.2021.031
Publication date: 8th June 2021
Nanocrystals of intermetallic compounds are a large family of emerging materials with highly promising catalytic, plasmonic, magnetic, and energy storage and conversion applications. However, generalized synthetic approaches for intermetallic nanocrystals are lacking. Here we report the development of a colloidal synthesis based on amalgamation of monometallic nanocrystal seeds with low-melting point metals. We use this approach to achieve crystalline and compositionally uniform intermetallic nanocrystals of Au-Ga, Ag-Ga, Cu-Ga, Ni-Ga, Pd-Ga, Pd-In and Pd-Zn compounds. We demonstrate a compositional tunability across phases (e.g., AuGa2, AuGa, Au7Ga2, and Ga-doped Au nanocrystals for the bimetallic Au-Ga system), while each phase can be prepared with accurate size control and excellent size uniformity. TOC Graphic shows monodisperse and compositionally uniform Pd-bimetallic nanocrystals, illustrating the applicability of amalgamation seeded growth towards intermetallic nanocrystals with unprecedented quality and flexibility of materials design. Our new synthetic method is simple, predictive, and generalizable, giving access to a large family of size and composition controlled intermetallic nanocrystals, thus opening up a multitude of possibilities for these materials.
This work has been accepted to the publication (Science Advances) on 20. May 2021.
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