Surface-enhanced Raman scattering (SERS) is a quick and highly sensitive analytical technique for molecules detection at trace level. Copper as a SERS substrate has the advantages of low-cost and stability. In this work, we designed and characterized an Ag-Cu-based dendritic periodic array substrate. The ordered dendritic silver-copper on silicon substrate was fabricated through photolithography and electrodeposition. The performance of the structure as a SERS substrate was assessed using rhodamine 6G (R6G) as the probe molecule at concentrations ranging from 1.0×10-5 to 1.0×10-10 mol/L. Through optimization of the period length and deposition parameters, the substrate has shown an enhancement factor (EF) up to 107, demonstrating excellent SERS activity. We also discovered Cu-only substrate demonstrates similar performance. The proposed method provides new pathways for designing various alloyed SERS substrates.
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