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In the search for novel nanostructured materials for UV plasmonics a limitednumber of choices can be done. Materials such as aluminum, rhodium, gallium andfew others can be used. One of the most interesting application for UVplasmonics is Surface Enhanced Raman Spectroscopy. It can be extended to thisspectral range to explore spectral properties of biomolecules that have only asmall cross section in the visible spectral range. We have recently reported ona functional substrates based on nanoporous aluminum decorated with rhodiumnanoparticles. This system showed an interesting behavior for UV excitation at266 nm, with an unexpected decreasing Raman intensity for increasing rhodiumnanoparticles concentrations. We proposed that this effect can be due to thedifficult access to the hot spots for the molecules deposited via thermalevaporation. Here we extend this study exploring the performance of the systemat another UV excitation wavelengths (325 nm) reporting on experimental resultsobtained using a deposition process that can bring the molecules at thehot-spots in a more efficient way. Extensive spectroscopic acquisitions,combined with 3D maps, allow to shade a more clear view on the performance ofthis plasmonic platform. In particular, the photodegration and the potentialoxidation of biomolecules driven by the hot-electron/hot-holes produced by therhodium nanoparticles will be reported.

UV-SERS monitoring of plasmons photodegradation of biomolecules on Aluminum platforms decorated with Rhodium nanoparticles