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Journal of Sol-Gel Science and Technology

, Volume 81, Issue 1, pp 95–104 | Cite as

Ethanol–water co-condensation into hydrophobic mesoporous thin films: example of a photonic ethanol vapor sensor in humid environment

  • Mickael Boudot
  • Andrea Cattoni
  • David Grosso
  • Marco Faustini
Original Paper: Sol-gel and hybrid materials for catalytic, photoelectrochemical and sensor applications

Abstract

In this work, we report a new generation of sol–gel photonic vapor sensor based on water-repellent methyl-functionalized mesoporous silica thin films for the detection of alcohol vapors. Relative humidity, generally accountable for sensor performance deterioration, was demonstrated as a key parameter to detect and enhance sensor sensitivity concerning ethanol. The ethanol-assisted water vapor capillary condensation into hydrophobic mesopores was observed and investigated as an innovative sensing mechanism. We showed that water condensation was triggered by the surfactant-like behavior of alcohol molecules whose alkyl moieties preferentially interact with the hydrophobic walls and reversibly switch the surface energy from hydrophobic to hydrophilic. Influence of the ethanol and water pressure conditions for which the capillary condensation occurs were studied by in situ ellipsometry. This study revealed a synergic mechanism of co-adsorption where the minimum ethanol concentration allowing water capillary adsorption decreases when humidity increases. Nanopatterned diffraction gratings films, fabricated via a nanoimprinting process, were demonstrated to be efficient transductor to transform the capillary-induced nanoscale variations of refractive index of the porous materials into optical signals easily measurable by conventional camera. Sensing results exhibited an ethanol vapor pressure threshold limit of detection of P/P 0 EtOH  = 0.07 at 100 % relative humidity and typical response and regeneration times are below one minute.

Graphical Abstract

Keywords

Hydro-alcoholic capillary co-condensation Sol–gel nanoimprinting Optical sensor Ethanol sensing 

Notes

Acknowledgments

We are grateful for funding provided by CIFRE fund granted by ANRT and the AVATAR project which is supported by Polyrise SAS, and DGA. M. Boudot et al. thanks D. Montero for SEMFEG microscopy conducted on a Hitachi Su-70 + Oxford XMax facilited by the IMPC (FR2482) financially supported by the C’Nano projects of the Region Ile-de-France.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Institute for Materials Chemistry and EngineeringKyushu UniversityKasugaJapan
  2. 2.Laboratoire de Photonique et de Nanostructure, CNRSUniversité Paris-SaclayMarcoussisFrance
  3. 3.UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574Sorbonne UniversitésParisFrance

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