Abstract
ABSTRACT Surface differential reflectance spectroscopy (SDRS), an optical characterization technique, is sensitive enough to observe the minute changes in the surface plasmon resonance (SPR) of noble metal nanoparticles (NPs). This SPR, which causes a sharp absorption of light in the visible range, is extremely sensitive not only to the morphology and organization of the NPs, but also to the chemical atmosphere surrounding them. Hence, taking SPR as a signature phenomenon, we have studied the reactivity of Ag NPs using a dedicated in situ SDRS set-up mounted on a magnetron sputtering machine. Real-time optical characterizations were possible not only during the deposition of Ag NPs, but also during their exposure to gases such as O 2 , N 2 , Ar, either non-ionized or partially i onized. This optical study reveals that Ag NPs are reactive to non-ionized O 2 exposure, which induces modifications in the SPR characteristics (width, amplitude and position of the absorption band) in contrast to N
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