Abstract
Deep-ultraviolet surface-enhanced Raman scattering (UV-SERS) is a promising technique for bioimaging and detection because many biological molecules possess UV absorption lines leading to strongly resonant Raman scattering. Here, Al nanovoid substrates are developed by combining nanoimprint lithography of etched polymer/silica opal films with electron beam evaporation, to give a high-performance sensing platform for UV-SERS. Enhancement by more than 3 orders of magnitude in the UV-SERS performance was obtained from the DNA base adenine, matching well the UV plasmonic optical signatures and simulations, demonstrating its suitability for biodetection.
Highlights
Surface-enhanced Raman scattering is a powerful technique to probe small traces of substances via the strong concentration of electric fields on plasmonic substrates
Tuning the Raman excitation laser to an electronic absorption line increases the Raman scattering cross-section dramatically and leads to resonant Raman scattering, which can be amplified by thousands of times over the nonresonant scattering.[7]
Well-defined Al NP patterns can be generated on a developed substrate, which have been utilized as UV SERS substrates.[18]
Summary
Surface-enhanced Raman scattering is a powerful technique to probe small traces of substances via the strong concentration of electric fields on plasmonic substrates. Al supports strong plasmons across a broad spectrum ranging from the deep-UV (244 nm) to the NIR, making it a rather universal plasmonic material, as recently demonstrated by Mogensen et al.[20] So far, it remains challenging to fabricate colloidal Al nanoparticles (NPs).[21−24] Al NPs can be formed by annealing Al films, their size distribution is very broad with irregular spacing.[25] Using interference lithography, well-defined Al NP patterns can be generated on a developed substrate, which have been utilized as UV SERS substrates.[18] such methods are expensive and are not scalable.
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