Sol–Gel for Gas Sensing Applications

Gaspera, Enrico Della; Guglielmi, Massimo; Martucci, Alessandro

doi:10.1002/9783527670819.ch38

Cited by 5 publications

(3 citation statements)

References 151 publications

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“…of a metal oxide or organic (polymer, graphene, carbon nanotube, etc.) material induced by the interaction with the targeted molecule at its surface [3][4][5][6]. Resistive electrical-type gas sensors have been the most studied in the past years, probably due to their relative ease to be integrated in electronic devices, but they suffer some drawbacks as cross-sensitivity, electromagnetic noise dependence, or response drift [7].…”

Section: Introductionmentioning

confidence: 99%

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

Boudot

Cattoni

Grosso

et al. 2016

J Sol-Gel Sci Technol

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In this work, we report a new generation of solgel photonic vapor sensor based on water-repellent methylfunctionalized 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 coadsorption 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

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Section: Introductionmentioning

confidence: 99%

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

Boudot

Cattoni

Grosso

et al. 2016

J Sol-Gel Sci Technol

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“…Within this context, there is a clear need to diversify the solvent compatibility of inorganic nanocrystals and develop methods to handle ITO and other metal oxides in water and solvents of low toxicity. This is particularly relevant to deposition techniques that involve large quantities of vapor effluents such as spray coating, 8,23,24 which is one of the leading candidates for the economically scalable and high throughput fabrication of optical quality nanocrystal thin films. So far, the primary strategy to disperse nanocrystals in aqueous solvent is to functionalize their surface with hydrophilic molecules.…”

Section: ■ Introductionmentioning

confidence: 99%

Aqueous Processing and Spray Deposition of Polymer-Wrapped Tin-Doped Indium Oxide Nanocrystals as Electrochromic Thin Films

et al. 2020

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Plasmonic metal oxide nanocrystals are interesting electrochromic materials because they display high modulation of infrared light, fast switching kinetics, and durability. Nanocrystals facilitate solution-based and high-throughput deposition, but typically require handling hazardous nonaqueous solvents and further processing of the as-deposited film with energy-intensive or chemical treatments. We report on a method to produce aqueous dispersions of tin-doped indium oxide (ITO) by refunctionalizing the nanocrystal surface, previously stripped of its native hydrophobic ligands, with a hydrophilic poly(acrylic acid) polymer featuring a low density of methoxy-terminated poly(ethylene oxide) grafts (PAA-mPEO4). To determine conditions favoring the adsorption of PAA-mPEO4 on ITO, we varied the pH and chemical species present in the exchange solution. The extent of polymer wrapping on the nanocrystal surface can be tuned as a function of the pH to prevent aggregation in solution and deposit uniform, smooth, and optical quality spray coated thin films. We demonstrate the utility of polymer-wrapped ITO nanocrystal thin films as an electrochromic material and achieve fast, stable, and reversible near-infrared modulation without the need to remove the polymer after deposition provided that a wrapping density of ∼20% by mass is not exceeded.

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“…The sol-gel technique has been widely used to prepare functional materials for gas sensing applications [ 32 , 33 ]. In particular, LSPR sensors based on sol-gel film has been extensively studied by Ohodnicki and co-workers.…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Thin Films for Plasmonic Gas Sensors

Gaspera

Martucci

2015

Sensors

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Plasmonic gas sensors are optical sensors that use localized surface plasmons or extended surface plasmons as transducing platform. Surface plasmons are very sensitive to dielectric variations of the environment or to electron exchange, and these effects have been exploited for the realization of sensitive gas sensors. In this paper, we review our research work of the last few years on the synthesis and the gas sensing properties of sol-gel based nanomaterials for plasmonic sensors.

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Sol–Gel for Gas Sensing Applications

Cited by 5 publications

References 151 publications

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

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

Aqueous Processing and Spray Deposition of Polymer-Wrapped Tin-Doped Indium Oxide Nanocrystals as Electrochromic Thin Films

Sol-Gel Thin Films for Plasmonic Gas Sensors

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