Solid supported 2D assembly of silver nano cubes was fabricated by Langmuir-Blodgett technique and employed to investigate its\nsurface enhanced Raman scattering (SERS) and surface enhance fluorescence (SEF) activities by detecting Rh6G in solution of\nvaried concentrations, that is, 10?12 M, 10?9 M, 10?6 M, and 10?3 M. SERS was detected from a nanomolar concentration of Rh6G\nwhereas SEF was detected from a picomolar concentration. Further, the substrate was subjected to thermal annealing to fabricate\nplasmonic thin film. The formation of thin film was followed by monitoring its surface plasmon resonance spectra and atomic force\nmicroscopic images. It was observed that the characteristic spectral peaks of silver nanocubes merged into a broad spectral band\nas the annealing time was increased and the intensity of the band decreased with the formation of thin film. The obtained result\nimplies that thermal annealing could be a simple approach to create nanoscale gaps in SERS substrate and to engineer continuous\nthin film from the assembly of discrete nano particles.
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