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SEM micrographs of NPG synthesized by means of free corrosion for 5 min (a) and 24 h (b). (c) UV-Vis extinction spectra and (d) the resonant peak position of and of NPG with the pore sizes of 10–50 nm in water. For comparison, the dashed line represents the size dependence resonant band of gold nanoparticles.
UV-Vis extinction spectra of porous gold films with (a) 10 nm; (b) 30 nm, and (c) 50 nm are recorded by immersing them into various dielectric environments. Refractive index of these solution increases from left to right: water , ethanol , 3:1 ethanol/toluene , 1:1 ethanol/toluene , 1:3 ethanol/toluene , and toluene . (d) Dependence of resonance (, empty symbols) and LSPR (, solid symbols) peaks of NPG films on refractive index.
(a) UV-Vis extinction spectra and (b) pore size dependence of plasmon peak of bare NPG in air (dashed lines), in water (short dashed lines) and NPG coated with HSA monolayer (solid lines).
(a) DDA simulated SPR spectra of NPG with various nanopore sizes. (b) The relationship between the SPR band of NPG and dielectric index of a surrounding medium.
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