Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.326
Publication date: 7th February 2022
Nanocrystals (NCs) of intermetallic compounds (IMCs, long-range ordered alloys) are a large family of emerging materials. They offer attractive characteristics originating from well-defined crystallinity, synergistically combined properties of the incorporated metals and unique size- and surface-related physical and chemical phenomena exhibited by NCs. Intermetallic NCs have recently acquired a large amount of research interest due to their extensive applications in catalysis, electronics, e.g. thermoelectric devices and memory technologies, superconductivity, energy storage and conversion technologies, photonics and in life sciences and medicine. Nevertheless, a general synthetic method towards uniform intermetallic nanocrystals was still lacking.
We have developed a wet-chemical colloidal synthesis method towards uniform intermetallic nanocrystals based on the amalgamation of monometallic nanocrystal seeds with low-melting point metals [1]. 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 both compositional tunability across the phase spaces (e.g. AuGa2, AuGa, Au7Ga2 and Ga-doped Au), size tunability (e.g. 14.0, 7.6 and 3.8 nm AuGa2) and size uniformity (e.g. 5.4 % size deviations). In summary, the developed amalgamation seeded growth approach makes it possible to systematically achieve size and composition controlled intermetallic nanocrystals of excellent quality, opening up a multitude of possibilities for these materials.
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