Figure 3
Stability of graphene-protected SPR.
(a) Spectral dependence of the SPR measured at 49° in air for freshly fabricated unprotected Cu (black curve), Cu protected with a single graphene layer (red) and Cu with a double layer protection (blue). The Cu thickness d = 43.5 nm. The inset shows results of our modelling for this experiment. (b) Fresh unprotected sample in contact with water. (c) Same as (b) after 24 hours in water. (d) Graphene-protected sample in water after half a year. A large SPR shift compared to (b) is connected with the usage of SPR resonance of longer wavelengths which becomes more pronounced after graphene transfer. (e) SPR ellipsometric reflection for a fresh unprotected silver film (d = 60 nm). (f) The same film covered with graphene.
