Sol-gel TiO 2 nanoimprinted metasurface combined to hybrid-silica sensitive layers for selective VOC detection with high refractive index sensitivity
Résumé
TOC VOC detection at sub-ppm levels, associated to a high RI variation sensitivity, was achieved by direct reflection on a surface composed of sol-gel organic-inorganic microporous sensitive layers embedding an array of 140 nm TiO2 pillar antennas prepared by sol-gel nanoimprint. Such a performance was attributed to the electromagnetic confinement within the Titania pillars, enhancing the interaction of the radiation with the sensitive media. The system also shows a relatively good selectivity by comparing the adsorption of five different VOCs with various polarity indexes within six different sensitive sol-gel layers.
Domaines
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