Monitoring the reactivity of Ag nanoparticles in oxygen atmosphere by using in situ and real-time optical spectroscopy

Vivek V. Antad; Lionel Simonot; David Babonneau; Sophie Camelio; Frédéric Pailloux; Philippe Guérin

doi:10.1117/1.JNP.6.061502

6 April 2012 Monitoring the reactivity of Ag nanoparticles in oxygen atmosphere by using in situ and real-time optical spectroscopy

Vivek V. Antad, Lionel Simonot, David Babonneau, Sophie Camelio, Frédéric Pailloux, Philippe Guérin

Author Affiliations +

Journal of Nanophotonics, Vol. 6, Issue 1, 061502 (April 2012). https://doi.org/10.1117/1.JNP.6.061502

Abstract

Surface differential reflectance spectroscopy (SDRS) is sensitive enough to observe the minute changes in the surface plasmon resonance (SPR) of noble metal nanoparticles (NP_s), which is extremely dependent on the morphology and organization of the NPs as well as on the chemical atmosphere surrounding them. Taking this SPR as a signature, we have studied the reactivity of Ag NPs using a dedicated in situ SDRS setup adapted on a magnetron sputtering deposition machine. This configuration allowed us to analyze the SPR modifications in real-time, not only during the growth of Ag NPs, but also during their exposure to molecular O₂ and during their capping by a dielectric (Si3N4) matrix. Real-time SDRS analysis reveals that, upon exposure of the Ag NPs to O₂, their SPR characteristics (position, amplitude, and width of the absorption band) alter immediately, indicating the instantaneous reactive interactions between Ag NPs and adsorbed O₂ molecules. In addition, during the deposition of the Si₃N₄ matrix, real-time SDRS reveals possible breaking of Ag-O₂ interactions. Moreover, with increasing Ag NP size, SPR modifications are seen to be reduced in O₂ atmosphere, suggesting the diminution of Ag-O₂ reactive interactions in the bigger NPs compared to the smaller ones.

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Vivek V. Antad, Lionel Simonot, David Babonneau, Sophie Camelio, Frédéric Pailloux, and Philippe Guérin "Monitoring the reactivity of Ag nanoparticles in oxygen atmosphere by using in situ and real-time optical spectroscopy," Journal of Nanophotonics 6(1), 061502 (6 April 2012). https://doi.org/10.1117/1.JNP.6.061502

Published: 6 April 2012

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