Synthesis and Optical Characterization of Silver Nanoparticles (Ag-NPs) Thin Films (TFs) Prepared by Silar Technique

Abstract

Article InfoThis 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 UVVis (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 -1 were 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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“…As can be seen from Figure c, the results confirm a direct band gap with an energy value of 2.36 eV, and this indicates that the prepared sample needs less energy to facilitate the electron transitions within the energy bands. Further, the band gap energy ( E g ) value is lower than that of AgO and consistent with the previously reported literature. , The optical conductivity (σ opt ) was calculated by employing eq where α, n , and c are the absorption coefficient, refractive index, and speed of light in vacuum, respectively. A material’s optical conductivity (σ opt ) shows the relationship between the magnitude of the induced electric field ( E ) and the density of the resultant current when exposed to a specific frequency.…”

“…Further, the band gap energy (E g ) value is lower than that of AgO and consistent with the previously reported literature. 44,45 The optical conductivity (σ opt ) was calculated by employing eq 14…”

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