Alloy nanostructures unveil extraordinary plasmonic phenomena that supersede the mono-metallic counterparts. Here we report silver-gold (Ag-Au) alloy nanohole arrays (α-NHA) for ultra-sensitive plasmonic label-free detection of (). Large-area α-NHA were fabricated by using nanoimprint lithography and concurrent thermal evaporation of Ag and Au. The completely miscible Ag-Au alloy exhibits an entirely different dielectric function in the near infra-red wavelength range compared to mono-metallic Ag or Au. The α-NHA demonstrate substantially enhanced refractive index sensitivity of 387 nm/RIU, surpassing those of Ag or Au mono-metallic nanohole arrays by approximately 40%. Moreover, the α-NHA provide highly durable material stability to corrosion and oxidation during over one-month observation. The ultra-sensitive α-NHA allow the label-free detection of in various concentration levels ranging from 10 to 10 cfu/ with a calculated limit of detection of 59 cfu/. This novel alloy plasmonic material provides a new outlook for widely applicable biosensing and bio-medical applications.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8176792 | PMC |
| http://dx.doi.org/10.1364/BOE.420828 | DOI Listing |
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