Nanocomposite systems and nanoparticle (NP) films are crucial for many applications and research fields. The structure-properties correlation raises complex questions due to the collective structure of these systems, often granular and porous, a crucial factor impacting their effectiveness and performance. In this framework, we investigate the optical and morphological properties of Ag nanoparticles (NPs) films and of Ag NPs/TiO2porous matrix films, one-step grown by supersonic cluster beam deposition. Morphology and structure of the Ag NPs film and of the Ag/TiO2(Ag/Ti 50-50) nanocomposite are related to the optical properties of the film employing spectroscopic ellipsometry (SE). We employ a simple Bruggeman effective medium approximation model, corrected by finite size effects of the nano-objects in the film structure to gather information on the structure and morphology of the nanocomposites, in particular porosity and average NPs size for the Ag/TiO2NP film. Our results suggest that SE is a simple, quick and effective method to measure porosity of nanoscale films and systems, where standard methods for measuring pore sizes might not be applicable.

Cavaliere, E., Benetti, G., Van Bael, M., Winckelmans, N., Bals, S., Gavioli, L., Exploring the optical and morphological properties of ag and Ag/TiO2nanocomposites grown by supersonic cluster beam deposition, <<NANOMATERIALS>>, 2017; (7): 442-456. [doi:10.3390/nano7120442] [http://hdl.handle.net/10807/110201]

Exploring the optical and morphological properties of ag and Ag/TiO2nanocomposites grown by supersonic cluster beam deposition

Cavaliere, Emanuele;Benetti, Giulio;Gavioli, Luca
2017

Abstract

Nanocomposite systems and nanoparticle (NP) films are crucial for many applications and research fields. The structure-properties correlation raises complex questions due to the collective structure of these systems, often granular and porous, a crucial factor impacting their effectiveness and performance. In this framework, we investigate the optical and morphological properties of Ag nanoparticles (NPs) films and of Ag NPs/TiO2porous matrix films, one-step grown by supersonic cluster beam deposition. Morphology and structure of the Ag NPs film and of the Ag/TiO2(Ag/Ti 50-50) nanocomposite are related to the optical properties of the film employing spectroscopic ellipsometry (SE). We employ a simple Bruggeman effective medium approximation model, corrected by finite size effects of the nano-objects in the film structure to gather information on the structure and morphology of the nanocomposites, in particular porosity and average NPs size for the Ag/TiO2NP film. Our results suggest that SE is a simple, quick and effective method to measure porosity of nanoscale films and systems, where standard methods for measuring pore sizes might not be applicable.
Inglese
http://www.mdpi.com/2079-4991/7/12/442/pdf
Cavaliere, E., Benetti, G., Van Bael, M., Winckelmans, N., Bals, S., Gavioli, L., Exploring the optical and morphological properties of ag and Ag/TiO2nanocomposites grown by supersonic cluster beam deposition, <>, 2017; (7): 442-456. [doi:10.3390/nano7120442] [http://hdl.handle.net/10807/110201]
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