In this letter, the authors report the observation of metal-enhanced fluorescence emission from fluorophores deposited on copper (Cu) substrates. Different thicknesses of Cu particulate films (from 1 to 5nm) were deposited onto glass slides using thermal vapor deposition. Fluorophores positioned in close proximity to the Cu films show fluorescence enhancement as a function of the Cu thickness increases, reaching a maximum (2.5-fold) at ≈3nm. The findings strongly suggest that surface plasmons from Cu can radiate and therefore enhance a fluorophore’s spectral properties, similar to observations reported for both silver and gold nanoparticle deposited substrates.
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Zhang et al. (2007) studied this question.
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