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| Identifier |
000334745 |
| Title |
Μελέτη της φωτοκαταλυτικής δράσης νανοδομών ZnO και νανοδομημένων υμενίων TiO2 πάνω σε πολυμερικά υποστρώματα |
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Author
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Λυρώνη, Νικολέττα
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Thesis advisor
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Κατσαράκης, Νίκος
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| Abstract |
In this thesis, the growth of ZnO micro-, and nanostructures as well as of TiO2 nanostructured thin films on polymer substrates (PE, PET) by aqueous chemical growth and / or sol-gel at low temperatures (≤95 οC) was studied. In addition, composite polymeric
materials (PE / ZnO ή TiO2) were fabricated by using commercial powders of ZnO and TiO2.
The final goal of this work was the study of the photocatalytic activity of the as-prepared materials by monitoring the degradation of methylene blue.
It can be concluded that, both the micro- and nanostructures of ZnO and the nanostructured TiO2 thin films deposited on polymeric PE and PET substrates with or without the presence of a seed layer, show remarkable photocatalytic activity and decompose
methylene blue. The occurrence though of a ZnO seed layer improves the adhesion of the ZnO nanostructures on PE and leads to the formation of highly oriented ZnO nanorods, which
are grown perpendicular to the substrate and provide excellent photocatalytic efficiency to the samples.
Concerning the nanostructured TiO2 thin films on PE substrates, the presence of a ZnO or TiO2 seed layer leads to an increase of the photocatalytic efficiency of the samples, especially for the longer deposition periods. This could be attributed to the formation of anatase TiO2 on the PE substrates even at those low temperatures (≤95 οC).
Finally, the photocatalytic efficiency of the composite materials that were fabricated by the dispersion of commercial ZnO or TiO2 powders into the polymeric PE phase was increased mainly for the samples having high percentage of the dispersed phase (40%). The
EDX analysis as well as the mapping of the semiconductor elements (either for ZnO or TiO2) gives evidence for the excellent dispersion of the ZnO and TiO2 powders into the polymeric
phase.
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| Language |
Greek |
| Subject |
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Zinc Oxide (ZnO) |
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aqueous |
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hydrothermal synthesis |
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methylene blue |
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nanostructures |
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photocatalysis |
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spherically nanostructured thin films |
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titanium dioxide (TiO2) |
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Διοξείδιο του τιτανίου (TiO2) |
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Οξείδιο του ψευδαργύρου (ZnO) |
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μπλε του μεθυλενίου |
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νανοδομές |
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νανοδομημένα σφαιρικά υμένια |
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φωτοκατάλυση |
| Issue date |
2008-12-04 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
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Type of Work--Post-graduate theses
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| Views |
214 |
Μελέτη της φωτοκαταλυτικής δράσης νανοδομών ZnO και νανοδομημένων υμενίων TiO2 πάνω σε πολυμερικά υποστρώματα
