Functional metal oxide surfaces: Photocatalytic, self-cleaning andmicro-/nanostructuring applications
Başlık çevirisi mevcut değil.
- Tez No: 759884
- Danışmanlar: PROF. DR. FRANZ FAUPEL, PROF. DR. LORENZ KİENLE, PROF. DR. JOST ADAM
- Tez Türü: Doktora
- Konular: Metalurji Mühendisliği, Mühendislik Bilimleri, Metallurgical Engineering, Engineering Sciences
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2021
- Dil: İngilizce
- Üniversite: Christian-Albrechts-Universität zu Kiel
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 202
Özet
Özet yok.
Özet (Çeviri)
Photocatalysis is the most applicable approach to decompose various organic pollutants due to its high efficiency, low-cost, and eco-friendly nature. Heterogeneous photocatalysis has become a hot topic in the field of green chemistry. Titanium (IV) oxide (TiO2) photocatalyst has been widely investigated in comparison to other metal oxide semiconductors due to its high activity, low cost, and high chemical and physical stability. On the other hand, TiO2 is also preferable materials in some specific applications such as self-cleaning (indoor and outdoor applications). This dissertation covers the development of TiO2 based functional metal oxide surfaces for photocatalytic and self-cleaning applications as well as micro- /nanostructuring of gold (Au) and silver (Ag). This thesis is composed of 14 Chapters: Following Introduction (Chapter 1) and Theoretical Background (Chapter 2), Method and Characterization processes are described in Chapter 3. The Results and Discussion, which are originally based on peer-reviewed nine publications, are presented in corresponding nine chapters (Chapters 4, 5, 6, 7, 8, 9, 10, 11, and 12). Afterward, Summary & Conclusion and Outlook are presented in Chapter 13 and Chapter 14, respectively. Chapter 4 (reprinted version of Publication 1) covers extremely high catalytic activity with Au/ZnOCeO2 hybrid structure in the presence of sodium borohydride (NaBH4), via electron relay process. Systematic studies were carried out to find the optimum ratio between CeO2 and ZnO which yields a high surface area, stable support for Au loading, and a dynamic Ce3+/Ce4+ conversion. We demonstrated that the continuous fluctuation of Ce3+/Ce4+ and the metallic character of Au nanoparticles residing on ZnOCeO2 structures form an effective electron relay system that yields high catalytic degradation rates. Chapter 5 (reprinted version of Publication 2) covers a facile method to synthesize hierarchical Au needle clusters (HAuNCs) on highly active TiO2 thin film. The systematic studies were carried out to control the size and the geometry of deposited HAuNCs by simply altering the photocatalytic activity of the TiO2 target, UV light intensity, and irradiation time. Also, the photocatalytic deposition approach was used for positioning and patterning of HAuNCs on the TiO2 target without using any surfactant or stabilizer. Chapter 6 (based on Publication 3) covers an effective way of preparing a highly active Au nanocluster (NC) decorated TiO2 thin film by a novel photodeposition method. Here, the solvent types were altered as well as the illumination time to control the surface coverage of the Au NCS, which has a direct effect on the photocatalytic activity. Au NCs (at low surface coverage) seem to significantly enhance the optical absorption of TiO2 at UV wavelengths and therefore lead to higher photocatalytic performance. Chapter 7 (reprinted version of Publication 4) covers plasmonic and non-plasmonic contributions of Au nanoparticles (NPs) on the overall photocatalytic activity of the Au-TiO2 hybrid structure. The systematic studies were conducted on the different ratio of the visible (Vis) and ultra-violet (UV) light (Vis/UV) to Page | iv investigate plasmonic and non-plasmonic enhancements. Here, it is shown that a gradual increase of Vis/UV led to a steady enhancement of the photocatalytic performance of the Au-TiO2 hybrid structure. Chapter 8 (reprinted version of Publication 5) covers the photocatalytic deposition of Ag NPs on reactive sputtered columnar TiO2 structures. Here, the morphology and surface coverage of deposited Ag NPs were controlled by altering the UV exposure time. We have demonstrated that optimum surface coverage led to a significant increase in the photocatalytic activity of the Ag-TiO2 hybrid structure. Chapter 9 (reprinted version of Publication 6) covers a facile method, combining sputtering and gas aggregation techniques (GAS), to prepare a photocatalytic TiO2 thin film decorated with stable plasmonic aluminum (Al) NPs. Here, Al NPs show a localized surface plasmon resonance (LSPR) effect on TiO2 photocatalysis under UV irradiation. We have presented the negative and positive influences of LSPR on UV photocatalysis by irradiating Al-TiO2 hybrid structures at two different UV wavelengths: both at and above the plasmonic absorption of Al NPs. Chapter 10 (reprinted version of Publication 7) covers a magnetron sputtering and GAS approaches were combined for the preparation of columnar TiO2 structures decorated with PdO NPs. Here, a totally solventfree synthesis approach was presented for good control of surface coverage, size, morphology, and stoichiometry of PdO NPs in comparison to wet-chemical synthesis methods. We have revealed that a steady equilibrium between PdO and PdO2 phases under UV irradiation seems to provide an efficient electron-hole pair separation, which improves the overall photocatalytic activity of PdO-TiO2 hybrid structure. Chapter 11 (reprinted version of Publication 8) covers a facile approach to synthesize cauliflower-like CeO2–TiO2 hybrid structures by magnetron reactive sputtering, exhibiting an extremely high photocatalytic activity. We have demonstrated that heating and air-quenching of the sputter-deposited TiO2 thin film (first layer) triggered the formation of a nanocrack network, the second heat-treatment led to the transformation of the CeO2 film (second layer) into CeO2 nanoclusters (NCs). Here, dynamic shifting of Ce3+/Ce4+, where at the CeO2-TiO2 interface, enhances the photocatalytic activity as well as self-cleaning properties in air. Chapter 12 (reprinted version of Publication 9) covers a combination of hard‐templating and infiltration processes. Here, the micro-and nanoscale topography were tuned by the 2D assembling of TiO2 nanoparticles on the surface. This overall process can be easily extended to the 3D TiO2 structure. Initiated chemical vapor deposition (iCVD) method was used to deposit an ultrathin and highly conformal polytetrafluoroethylene (PTFE) layer on bulk material (3D PTFE/TiO2). After coating a thin layer of PTFE, 3D TiO2 showed an extraordinary superhydrophobicity. Chapter 13 covers overall Summary & Conclusion for all presented researches in this thesis. Finally, an Outlook (Chapter 14) is provided for future research activities
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