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Proceedings Paper

Grating-coupled surface plasmon resonance gas sensing based on titania anatase nanoporous films
Author(s): Enrico Gazzola; Michela Cittadini; Laura Brigo; Giovanna Brusatin; Massimo Guglielmi; Filippo Romanato; Alessandro Martucci
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Paper 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.

Paper Details

Date Published: 28 August 2015
PDF: 8 pages
Proc. SPIE 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, 95471D (28 August 2015); doi: 10.1117/12.2186662
Show Author Affiliations
Enrico Gazzola, Univ. degli Studi di Padova (Italy)
Michela Cittadini, Univ. degli Studi di Padova (Italy)
Laura Brigo, Univ. degli Studi di Padova (Italy)
Fondazione Bruno Kessler (Italy)
Giovanna Brusatin, Univ. degli Studi di Padova (Italy)
Massimo Guglielmi, Univ. degli Studi di Padova (Italy)
Filippo Romanato, Univ. degli Studi di Padova (Italy)
Institute for Materials Manufacturing, CNR (Italy)
Alessandro Martucci, Univ. degli Studi di Padova (Italy)


Published in SPIE Proceedings Vol. 9547:
Plasmonics: Metallic Nanostructures and Their Optical Properties XIII
Allan D. Boardman; Din Ping Tsai, Editor(s)

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