Au-Ag nanostructures have been posited as potential room temperature, ambient pressure superconductors in past studies. These nanostructures comprise of discrete ~1 nm Ag nanocrystals embedded at specific loading densities into an Au matrix. This motif is nontrivial to produce through standard colloidal techniques that rely upon spherically or axially symmetric growth around a central nucleus. I will present methods to produce nanostructured Au-Ag films. These techniques enable a simplified route for the study and evaluation of the unconventional properties of these materials. The structural properties of materials produced through this method will be described. This presentation will further provide an overview of the unconventional optical and electrical properties of these materials. In particular, we will describe the suppression of plasmon resonances within these materials along with the emergence of a broad non-dissipative resonance over the visible. We will further describe the observation of zero resistance in films of these materials. In certain samples, these states with resistivity below 10<sup>-10</sup> ohm-m are also observed at temperature as large as 400 K. Other aspects including stability, and sensitivity of these materials towards air exposure will be discussed.

Simplified colloidal route for preparation of nanostructured Au-Ag films with superconductivity in the ambient

ACS Spring Meeting 2021

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