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Identifier 000446395
Title 3D laser lithography with applications in photocatalysis
Alternative Title Τρισδιάστατη λιθογραφία λέιζερ με εφαρμογές στην φωτοκατάλυση
Author Συγγελάκης, Ιωάννης
Thesis advisor Τζωρτζάκης, Στυλιανός
Reviewer Φαρσάρη, Μαρία
Κενανάκης, Γεώργιος
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.
Language English
Issue date 2022-03-18
Collection   School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/f/7/1/metadata-dlib-1646731234-865508-15339.tkl Bookmark and Share
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