Preventing Aluminum Photocorrosion for Ultraviolet Plasmonics
Ultraviolet plasmonics is a burgeoning scientific field where the strong molecular absorption bands in the UV range are combined with the intense electromagnetic fields of plasmonic nanostructures. This powerful combination is highly promising to promote surface-enhanced spectroscopy and catalysis. However, in a recent J Phys Chem Lett article, we find that the photocorrosion of aluminum can severely hamper UV plasmonics applications but appropriate protection solutions can circumvent this issue.
- We highlight the occurrence of the aluminum photocorrosion effect and explain its origin by the nonlinear absorption of water in the UV leading to the production of hydroxyl radicals.
- Different protection strategies are developed to prevent the photocorrosion based on scavengers for reactive oxygen species and additional polymer layers, achieving a 10-fold increase in the UV power range with no visible corrosion effect.
Also freely available on ArXiv 1907.11003