Room temperature ethanol sensor with SUB-PPM detection limit : improving the optical response by using mesoporous silica foam

Sebők, Dániel and Janovák, László and Sápi, András and Dobó, Dorina G. and Kukovecz, Ákos and Kónya, Zoltán and Dékány, Imre: Room temperature ethanol sensor with SUB-PPM detection limit : improving the optical response by using mesoporous silica foam. Proceedings of the International Symposium on Analytical and Environmental Problems, (22). pp. 407-411. (2016)

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Abstract

In this paper a low ppm-range ethanol sensor - operating at room temperature - is presented. The three types of ZnO2 based hybrid thin films as sensor surfaces consist of semiconductor nanoparticles, polyelectrolyte (polyacrylic acid, PAA) and/or mesoporous silica. The thin films were prepared by Layer-by-Layer (LbL) self-assembly method and were subjected to reflectometric interference measurements (RIfS) for testing sensorial application. The sensor investigation showed that the detection limit of the thin films is in the sub-ppm range. Applying mesoporous silica as surface coating or interlayers in the sandwich-structured thin film (ZnO/SF) improved the optical response, but the sensitivity showed non-linear characteristic. The thin film with mixed structure (ZnO/PAA/ZnO/SF) showed linear response in the 0.5-12 ppm range with 0.6 nm /ppm sensitivity and acceptable selectivity.

Item Type: Article
Journal or Publication Title: Proceedings of the International Symposium on Analytical and Environmental Problems
Date: 2016
Volume: 22
Page Range: pp. 407-411
ISBN: 978-963-306-507-5
Uncontrolled Keywords: Fizikai kémia
Additional Information: Bibliogr.: 411. p. ; összefoglalás angol nyelven
Date Deposited: 2018. Dec. 13. 11:14
Last Modified: 2018. Dec. 13. 11:14
URI: http://acta.bibl.u-szeged.hu/id/eprint/56132

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