Grating-coupled surface plasmon resonance gas sensing based on titania anatase nanoporous films

Enrico Gazzola; Michela Cittadini; Laura Brigo; Giovanna Brusatin; Massimo Guglielmi; Filippo Romanato; Alessandro Martucci

doi:10.1117/12.2186662

28 August 2015 Grating-coupled surface plasmon resonance gas sensing based on titania anatase nanoporous films

Enrico Gazzola, Michela Cittadini, Laura Brigo, Giovanna Brusatin, Massimo Guglielmi, Filippo Romanato, Alessandro Martucci

Author Affiliations +

Proceedings Volume 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII; 95471D (2015) https://doi.org/10.1117/12.2186662
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

Nanoporous TiO₂ anatase film has been investigated as sensitive layer in Surface Plasmon Resonance sensors for the detection of hydrogen and Volatile Organic Compounds, specifically methanol and isopropanol. The sensors consist of a TiO₂ nanoporous matrix deposited above a metallic plasmonic grating, which can support propagating Surface Plasmon Polaritons. The spectral position of the plasmonic resonance dip in the reflectance spectra was monitored and correlated to the interaction with the target gases. Reversible blue-shifts of the resonance frequency, up to more than 2 THz, were recorded in response to the exposure to 10000 ppm of H₂ in N₂ at 300°C. This shift cannot be explained by the mere refractive index variation due to the target gas filling the pores, that is negligible. Reversible red-shifts were instead recorded in response to the exposure to 3000 ppm of methanol or isopropanol at room temperature, of magnitudes up to 14 THz and 9 THz, respectively. In contrast, if the only sensing mechanism was the mere pores filling, the shifts should have been larger during the isopropanol detection. We therefore suggest that other mechanisms intervene in the analyte/matrix interaction, capable to produce an injection of electrons into the sensitive matrix, which in turn induces a decrease of the refractive index.

Conference Presentation

Citation Download Citation

Enrico Gazzola, Michela Cittadini, Laura Brigo, Giovanna Brusatin, Massimo Guglielmi, Filippo Romanato, and Alessandro Martucci "Grating-coupled surface plasmon resonance gas sensing based on titania anatase nanoporous films", Proc. SPIE 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, 95471D (28 August 2015); https://doi.org/10.1117/12.2186662

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