UV plasmonic properties of colloidal liquid-metal eutectic gallium-indium alloy nanoparticles

TL;DR

This paper demonstrates strong UV plasmonic resonances in colloidal liquid-metal eutectic gallium-indium nanoparticles suspended in ethanol, supported by experimental results and Mie theory modeling, advancing UV plasmonics applications.

Contribution

It provides the first experimental evidence of UV plasmonic resonances in colloidal liquid-metal EGaIn nanoparticles and offers a theoretical framework for understanding these phenomena.

Findings

Strong UV plasmonic resonances observed in EGaIn nanoparticles

Experimental results supported by Mie theory modeling

Potential applications in biomedical imaging and sensing

Abstract

Nanoparticles made of non-noble metals such as gallium have recently attracted significant attention due to promising applications in UV plasmonics. To date, experiments have mostly focused on solid and liquid pure gallium particles immobilized on solid substrates. However, for many applications, colloidal liquid-metal nanoparticle solutions are vital. Here, we experimentally demonstrate strong UV plasmonic resonances of eutectic gallium-indium (EGaIn) liquid-metal alloy nanoparticles suspended in ethanol. We rationalise experimental results through a theoretical model based on Mie theory. Our results contribute to the understanding of UV plasmon resonances in colloidal liquid-metal EGaIn nanoparticle suspensions. They will also enable further research into emerging applications of UV plasmonics in biomedical imaging, sensing, stretchable electronics, photoacoustics, and electrochemistry.