Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
Publication date: 28th August 2024
Liquid metals (LMs) are an interesting class of materials that possess a lower melting point compared to conventional metals. Thus, LMs combine the properties of a liquid with those of a metal, such as electrical and thermal conductivity, low vapor pressure, low melting point, and fluidity.[1]
Among LMs, Ga stands out due to its non-toxicity and near-room temperature melting point (29.6 oC), and subsequently, Ga is finding applications in drug delivery systems, soft robotics, printable devices, and catalysis.[1.2] Synthesis of Ga NPs as colloidal nanoparticles is desirable for convenient processability and maximizing surface-to-material ratio.[3] Tunability of size and composition can lead to interesting observations for plasmonic and catalytic properties.[4,5,6,7] Yet the library of these nanoparticles is currently limited.
Herein, we expand the chemistry of colloidal Ga NPs by synthesizing Ga NPs decorated with different metals. In particular, we focus on Fe, Ni, and Sn which are interesting for potential electrocatalytic applications. We use a seeded growth approach wherein a combination of heterogeneous nucleation and galvanic replacement reaction is involved in the formation of Ga NPs decorated with metal islands. The current synthesis scheme is powerful in realizing a low amount of the second metal (<1 w/w Fe: Ga %) and this second metal is mostly in the form of an oxide. Initial results demonstrate the possibility of using these NPs as electrocatalysts for the CO2 reduction reaction.
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