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Graphene-protected Cu SPR biosensor. (a) Schematic diagram of flow cell for SLG-protected Cu SPR biosensing. (b) Image of a typical graphene-protected Cu SPR sensor chip. (c,d) Stability of the SPR in buffer solution: The change of Cu SPR ellipsometric parameters (amplitude ψ and phase Δ) of the sensor chip after pumping buffer solution for 15 minutes (the black and red curves). The sensor chip is pre-functionalized with receptor. The buffer solution is 1 mM NaP buffer (pH 7.3).
