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Solid-state alloyed gold-silver nanostructures for plasmon resonance tailoring as highly sensitive SERS substrates

This work reports straightforward approach for AuAg alloyed nanostructures with solid-state dewetting. Successive thin films evaporation and thermal annealing enable fabrication of AuAg alloyed nanostructures with well-defined sizes and shapes. The complete miscibility of Au and Ag leads to programmable tailoring of the plasmon resonance over the entire visible wavelength region by varying corresponding film thickness. Such wide-range tuning capability of AuAg alloyed nanostructures is expected to be excellent candidates for highly sensitive surface-enhanced Raman scattering (SERS) substrates.