Post-graduate theses
Current Record: 26 of 124
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Identifier |
000446395 |
Title |
3D laser lithography with applications in photocatalysis |
Alternative Title |
Τρισδιάστατη λιθογραφία λέιζερ με εφαρμογές στην φωτοκατάλυση |
Author
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Συγγελάκης, Ιωάννης
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Thesis advisor
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Τζωρτζάκης, Στυλιανός
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Reviewer
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Φαρσάρη, Μαρία
Κενανάκης, Γεώργιος
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Abstract |
In this work three-dimensional (3D) structures covered by titanium dioxide
(TiO2) nanorods were designed and developed. These devices were designed for
photocatalytic applications due to the properties of this material and the increase in
active surface through the 3D structuring. Although in past, 3D scaffolds covered by
zinc oxide (ZnO) nanorods have been realized, the photocatalytic performance of the
new TiO2 hybrid 3D devices have shown showing promising results. As a consequence,
the implementation of the same idea but with different and more efficient photocatalytic
material would further enhance the photocatalytic performance.
Five important steps were realized for the accomplishment of this work. First,
hybrid 3D structures were fabricated via the MultiPhoton Lithography (MPL) method.
Then, the hybrid structures underwent a Post-Thermal Treatment (PTT) in order to be
transformed into 3D structures consisting of a ceramic-like material. The next step was
the deposition of a seed layer of TiO2 on the 3D structures by the Pulsed Laser
Deposition (PLD) method. Next, the hydrothermal synthesis of TiO2 nanorods was
achieved using an Aqueous Chemical Growth (ACG) technique. Finally, the
photocatalytic performance of new 3D devices was characterized via photocatalytic
degradation of organic pollutants such as methylene blue (MB) and stearic acid. The
photocatalytic performance of the 3D structures covered by TiO2 nanorods was
compared to the performance of TiO2 nanorods grown on 2D surfaces. Also, the hybrid
3D structures performance was compared with photocatalytic films. Τhe expected
increase of photocatalytic efficiency of the new 3D devices has been confirmed
showing a dramatic decrease of organic pollutants concentration with a decomposition
coefficient of k = 0.059min−1.
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Language |
English |
Issue date |
2022-03-18 |
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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Permanent Link |
https://elocus.lib.uoc.gr//dlib/f/7/1/metadata-dlib-1646731234-865508-15339.tkl
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