Ag@alpha-Fe2O3 nanocomposite having a core-shell structure was synthesized by a two-step reduction-sol gel approach, including Ag nanoparticles synthesis by sodium borohydride as the reducing agent in a first step and the subsequent mixing with a Fe+3 sol for alpha-Fe2O3 coating. The synthesized Ag@alpha-Fe2O3 nanocomposite has been characterized by various techniques, such as SEM, TEM and UV-Vis spectroscopy. The electrical and gas sensing properties of the synthesized composite towards low concentrations of ethanol have been evaluated. The Ag@alpha-Fe2O3 nanocomposite showed better sensing characteristics than the pure alpha-Fe2O3. The peculiar hierarchical nano-architecture and the chemical and electronic sensitization effect of Ag nanoparticles in Ag@alpha-Fe2O3 sensors were postulated to play a key role in modulating gas-sensing properties in comparison to pristine alpha-Fe2O3 sensors.

Synthesis, characterization and gas sensing properties of Ag@α-Fe2O3 core–shell nanocomposites

Mirzaei, A.
Primo
;
Bonavita, A.;Bonyani, M.;Leonardi, S. G.
Penultimo
;
Neri, G.
Ultimo
2015-01-01

Abstract

Ag@alpha-Fe2O3 nanocomposite having a core-shell structure was synthesized by a two-step reduction-sol gel approach, including Ag nanoparticles synthesis by sodium borohydride as the reducing agent in a first step and the subsequent mixing with a Fe+3 sol for alpha-Fe2O3 coating. The synthesized Ag@alpha-Fe2O3 nanocomposite has been characterized by various techniques, such as SEM, TEM and UV-Vis spectroscopy. The electrical and gas sensing properties of the synthesized composite towards low concentrations of ethanol have been evaluated. The Ag@alpha-Fe2O3 nanocomposite showed better sensing characteristics than the pure alpha-Fe2O3. The peculiar hierarchical nano-architecture and the chemical and electronic sensitization effect of Ag nanoparticles in Ag@alpha-Fe2O3 sensors were postulated to play a key role in modulating gas-sensing properties in comparison to pristine alpha-Fe2O3 sensors.
2015
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/3121970
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