Abstract
Plasmonically active nanocrystalline silver (Ag) films of mass thickness ∼1 nm were fabricated using thermal evaporation followed by air annealing process temperature varying from 50 °C to 250 °C. The effect of air annealing on surface morphology and optical absorbance of quasi-amorphous and nanocrystalline Ag films was studied. The possibility of formation of silver oxide (AgO) at the surface level of Ag nanostructures due to air annealing was studied using a confocal Raman spectrometer. Surface enhanced Raman scattering (SERS) enhancement and its reverse mechanism known as fluorescence quenching corresponding to Rhodamine-6G (Rh6G) molecules were studied on Ag films through altering crystallinity, interparticles distance, size distribution and number density of Ag nanopartices (NPs).
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