Polyol Mediated Synthesis of Ag Nanowires Applied to Transparent Conductive Films and Ag Nanowires-TiO2 Composite Photoanodes for Dye-Sensitized Solar Cells
| Autor: | Li, Ke-Zhong, 李可中 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 Among the many metal nanomaterials, the development of silver nanowire is the most vigorous, the stability of silver is stable and the surface is not easy to be oxidized. Especially in the application of silver nanowire, it is widely studied in emerging fields. We used the polyol method to synthesize silver nanowire, and the size of the silver nanowire was controlled to obtain better optical, electrical and thermal properties. In this study, the silver nanowire was prepared by polyol synthesis. The silver nitrate was first dissolved in ethylene glycol to form a silver nitrate-ethylene glycol solution. Under heating, the silver nitrate-ethylene glycol solution was added to the PVP-ethylene glycol solution. The silver ions are reduced to silver nanoparticles, and PVP is used as a blocking agent, passivated the (100) plane of the silver causes silver to grow into a silver nanowire. The results show that when the reaction temperature is 170 ℃ and the molar ratio of silver nitrate: PVP = 1:3, the diameter of silver nanowires can be controlled below 50 nm, and the length above 25 μm, respectively, and the aspect ratio is 460. In this study, a synthetic one-dimensional silver nanowire was applied to transparent conductive films and a dye-sensitized solar cells. In the silver nanowire transparent conductive films, the silver nanowire forms a mesh-shaped conductive network in an overlapping manner, and the mesh structure hole can penetrate the light to achieve the effect of transparency and conductivity. In addition, in this study, the silver nanowire was coated on a transparent substrate by spin coating, the concentration was reduced and the coating was repeated to increase the light transmittance and conductivity, then filling the holes in the network structure of silver nanowire with PEDOT:PSS, and the conductive film has a light transmittance of 80% and having a resistance of 10 Ω. The addition of silver nanowires increases the photoelectric conversion efficiency of dye-sensitized solar cells. Due to the surface Plasmon Resonance (SPR), the surface of the silver nanowires can expand the wavelength of light absorption, increase the use of light, and excited more electrons of dye molecules, one-dimensional structure can provide electron directionality. The results show that the optimized electron transport when adding 0.3 wt% silver nanowire in titanium dioxide increases the short-circuit current density to 14.83 mA/cm2 and the photoelectric conversion efficiency reaches 7.92%. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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