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.

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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: Conference or Workshop Item
Journal or Publication Title: Proceedings of the International Symposium on Analytical and Environmental Problems
Date: 2016
Volume: 22
ISBN: 978-963-306-507-5
Page Range: pp. 407-411
Event Title: International Symposium on Analytical and Environmental Problems (22.) (2016) (Szeged)
Related URLs: http://acta.bibl.u-szeged.hu/55893/
Uncontrolled Keywords: Fizikai kémia
Additional Information: Bibliogr.: 411. p. ; összefoglalás angol nyelven
Date Deposited: 2018. Dec. 13. 11:14
Last Modified: 2022. Aug. 08. 15:48
URI: http://acta.bibl.u-szeged.hu/id/eprint/56132

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