Room temperature ethanol sensor with SUB-PPM detection limit improving the optical response by using mesoporous silica foam /
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 La...
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| Dokumentumtípus: | Könyv része |
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2016
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| Sorozat: | Proceedings of the International Symposium on Analytical and Environmental Problems
22 |
| Kulcsszavak: | Fizikai kémia |
| Online Access: | http://acta.bibl.u-szeged.hu/56132 |
| Tartalmi kivonat: | 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. |
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| Terjedelem/Fizikai jellemzők: | 407-411 |
| ISBN: | 978-963-306-507-5 |