The Optical Properties of Individual Silver Nanoparticles in Ag/Ag 2 O Composites Synthesized by Oxygen Plasma Treatment
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The Optical Properties of Individual Silver Nanoparticles in Ag/Ag2O Composites Synthesized by Oxygen Plasma Treatment of Silver Thin Films Kamal Kayed 1 Received: 22 January 2020 / Accepted: 31 March 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this work, we present a more complete description of the optical properties of the silver nanoparticles formed in silver oxide thin films. Ag/Ag2O composites were synthesized by treating silver thin films manufactured by thermal evaporation method with oxygen plasma afterglow. The results showed that exposing silver thin films to oxygen plasma afterglow leads to a monocrystalline structure of silver oxide. Consequently, the relationship between the crystal size and the characteristics of the plasmon optical absorption peaks was studied. A slight degradation of plasmon peaks of the individual silver nanoparticles was observed. We suggested that this degradation might be due to the mutual interaction between the individual silver nanoparticles located near the Ag2O grain shell and the larger silver nanoparticles in neighboring grains. We found that the degree of degradation is related to the Ag2O grain size. On the other hand, the origin of each fluorescence peak in the Raman spectra of the prepared films was determined. Keywords Silver oxide . Thin film . Plasmons . Thermal evaporation . Oxygen plasma afterglow . Raman spectroscopy
Introduction The increased interest in the synthesis and characterization of plasmonic silver nanoparticles (AgNPs) loaded semiconductor films (AgNPs/semiconductor composites) is due to the unique modifications to the optical properties of the semiconductor material caused by the silver nanoparticles that are mainly related to the surface plasmon resonance (SPR) of silver nanoparticles. In this direction, the use of silver is promising because of its tunable and strong SPR from the visible to near infrared spectral regions [1–3]. The resonance effect occurs due to light-driven collective oscillations of conduction electrons in metallic Ag nanoparticles [4–7], or in other words, due to the interaction of the incident light with the electron density surrounding AgNPs [8]. AgNP doping systems find various applications in many fields such as surface plasmon, optics, electronic devices, photonics, catalysis, photography, biosensing, photocatalytic technique, catalyst, surface-enhanced Raman scattering, solar * Kamal Kayed [email protected] 1
Department of Physics, Faculty of Science, Damascus University, Damascus, Syria
cells, sensor, optical data storage medium, and plasmon circuitry [9–28]. Each of these applications requires special engineering of AgNPs plasmonic response that depends on their shape, size, dielectric environment, and on mutual electromagnetic interactions among adjacent particles [29]. In Ag/Ag2O composites, any agglomeration in the Ag plasmonic system due to the nature of material processes used can have an effect on the measured fluorescence emission. Many previous works [30, 31] confi
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