| Title: | Method To Detect Ethanol Vapor in High Humidity by Direct Reflection on a Xerogel Coating |
| Author(s): | Dalstein O; Tabo M; Alvarez E; Roux L; Garuz R; Pasquinelli M; Azzi L; Bendahan M; Aguir K; Loizillon J; Abbarchi M; Grosso D; |
| Address: | "Institut Materiaux Microelectronique et Nanosciences de Provence, (IM2NP)-UMR CNRS 7334, Aix-Marseille Universite, Faculte des Sciences de Saint Jerome , 13397 Marseille Cedex 20, France" |
| Journal Title: | ACS Appl Mater Interfaces |
| ISSN/ISBN: | 1944-8252 (Electronic) 1944-8244 (Linking) |
| Abstract: | "A simple double thin-film coating-based device is proposed to quantify the ethanol content in humid air featuring a 10 ppm resolution and spanning a dynamic range from 0 to 1000 ppm. The transduction involves the measurement of the direct optical reflection intensity, changing upon refractive index variations induced by water and ethanol adsorption within the coatings. The first thin-film coating is a microporous methyl-functionalized, silica xerogel material more sensitive to alcohol, and the second one is a microporous pure silica xerogel material more sensitive to water. The precision of the sensor is achieved through a mathematical treatment applied on the time resolved adsorption period. Reflection signals of both the ethanol- and water-sensitive coatings are taken into account in the treatment to correct for differences in ambient conditions (temperature, relative humidity, presence of volatile organic compounds) within the same chamber previous to data analysis, which corresponds to realistic operating conditions. As the adsorption mechanism is governed by molecular dynamic equilibrium, these sensors are fast and instantaneously regenerated in ambient air. The sensor is easy to assemble and was reusable for a period exceeding 1 year (maximal tested time)" |
| Keywords: | coatings ethanol sensing humidity optical transduction sol-gel; |
| Notes: | "PubMed-not-MEDLINEDalstein, Olivier Tabo, Maxime Alvarez, Elsa Roux, Lucas Garuz, Richard Pasquinelli, Marcel Azzi, Lhoucine Bendahan, Marc Aguir, Khalifa Loizillon, Jerome Abbarchi, Marco Grosso, David eng 2019/01/11 ACS Appl Mater Interfaces. 2019 Jan 30; 11(4):4439-4446. doi: 10.1021/acsami.8b20479. Epub 2019 Jan 18" |
