Abstract            Volume:5  Issue-12  Year-2017         Original Research Articles

Online ISSN : 2347 - 3215 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcret@gmail.com

This work reports the synthesized plasmonic silver nanoparticles (Ag-NPs)by SILAR (successive ionic layer adsorption and reaction)technique on glass substrates with 5, 8, 11, 14 and 17 SILAR cycles and effect on the optical properties of the thin films (TFs). The absorbance data of the as-synthesized Ag-NPs thin films were obtained using UV-Vis (Ultraviolet visible) spectroscopy at room temperature in the wavelength range of 250nmto 900nm. The transmittance, absorption coefficient, optical bandgap, refractive index and extinction coefficient were experimentally measured. The absorption peaks of(450, 455, 470, 455, 500) nm, and optical energy band gaps of (2.20, 2.16, 2.12, 2.11, 1.84) eV with absorption coefficient approximately 10^-12 cm^-1were identified for the SILAR cycles, which agree to a particular characteristics of the silver nanoparticles surface plasmon resonance band. The results showed a red shift from 450nm to 500nm by increasing the SILAR cycles from 5 to 17 cycles, which is attributed to coalescence of Ag nanoparticles at higher SILAR deposition cycles. An increase in the refractive index of the films from 1.55 to 2.51 observed, with approximate average value of 1.92, may be due to the optical properties of silver nanoparticles. This study revealed that Ag-NPs synthesized by SILAR technique gives good optical properties with excellent absorption bands in the visible region, which has potential applications in technology.

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