Study on One-dimensional Zinc-based-Metal Oxides Nanostructures of Photoresponsive and Photocatalystic Properties
| Autor: | Guo-Kai Hsu, 徐國凱 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Vapor transport synthesis was used to synthesize one-dimensional zinc-based metal oxides, including zinc oxide nanorods and composite zinc stannate (i.e., ZnSnO3 and Zn3SnO4) nanowires. Investigate this two materials surface morphology, optical properties and photodetector, photocatalytic properties, respectively. A filed emission scanning electron microscope (FESEM) was used to analyze its surface morphology. A thin film X-ray diffractometer (TFXRD) was used to analyze its crystal structure and composition. A high-resolution transmission electron microscope (HRTEM) was used to analyze its crystallization and atomic arrangement. Photoluminescence (PL) was used to analyze the energy gap and internal defect of the material. An X-ray photoelectron microscope (XPS) was used to analyze the type of internal atom binding. A Photodetector was used to study the nanodevice`s properties, and a photocatalytic was used to examine the system of photodegradation properties. The synthetic ZnO nanorods have vertival preferred orientation [0001] in this study under a variety of temperatures of PL (300 K to 100 K) with energy gaps from 3.23 eV to 3.34 eV. Photodetector properties, zinc stannnate complex with perovskit phase with orthorhombic structure, under ultraviolet (UV-A, 315 nm < λ < 400 nm, I = 2.33 mWcm-2) had the highest sensitivities of 2666.67. The fast corresponding response and recovery times are 1 and 1.5 sec, respectively. The photocatalytic properties under 1 hour of UV-A (315 nm < λ < 400 nm, I = 2.33 mWcm-2) showed a photodegradation of 77.5 %, whereas under 6 hours of visible light (λ < 550 nm), the photodegradation was only 60.5 %. Composite Zinc stannate nanowires have the high efficiency photocatalytic properties because of the electron-hole pairs with a low recombination rate. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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