Ag-TiO2和VO2/Ag-TiO2薄膜的制备及光致阻热性能研究
文献类型：学位论文
| ; | |
| 作者 | Zheng JY(郑金玉) |
| 学位类别 | 硕士 |
| 答辩日期 | 2007-06-08 |
| 授予单位 | 中国科学院广州能源研究所 |
| 授予地点 | 广州能源研究所 |
| 导师 | 李新军 |
| 关键词 | 智能窗 半导体薄膜 TiO2 VO2 光生载流子分离 |
| 其他题名 | The preparation of Ag-TiO2 and VO2/Ag-TiO2 films and investigation of their photo-driven heat-preventing performance |
| 中文摘要 | Smart window is a very important part of the green energyefficient architecture. Because the most quantity of solar radiation passes though a window resulting in the enhanced room temperature in summer, which cause the higher expenses in air-condition. The defects of the traditional heat preventing films are inability to adjust smartly and low transmittance of the visible light. So, many researches have been done in order to find new energyefficient smart window. Recently, the application of VO2 films in temperature-driven smart window has been reported. Although, there are still some technical difficulties, it also gets abroad attentions. In this paper, we base on the separation of photo-generated carries to achieve the photo-driven semiconductor-metal transition of the semiconductor films in order to control the transmittance of these films. The silver-modified nano-structured TiO2 films were prepared by a layer-by-layer dip-coating sol-gel technique. The structure of the films was characterized by SEM and XRD. The separation efficiency of the photo-generated carriers was studied by the electrochemical workstation and photocatalytic degradation experiments. And the optical influence of the films by the separation of the carries was evaluated by UV-vis and FTIR spectrophotometer. VO2 films were prepared by aqueous sol-gel method and were composite with TiO2 films. Under the UV illumination, the phase transition of the composite VO2/TiO2 films was tested by four probe instrument. The results are as follows: (1) For the Ag-modifying films, the separation efficiency of the photo-generated carries can be evidently enhanced by the TA and AT modes. And furthermore, the enhanced separation of carries can reduce the transmittance of the infrared ray slightly. (2) The Ag loading content also has an important effect on the carries separation efficiency, and the optimal concentrations of TA and AT modes are both 0.5at%. (3) For the VO2/TiO2 films, under the UV illumination, the composite film of VO2 with bottom non-uniform doped TiO2 has the most evident reduction of the phase transition temperature. The mechanism for enhanced separate efficiency of photo-generated carries of Ag-modifying TiO2 films was based on the formation of the Schottky barriers and their non-uniform distribution. The mechanism for the effect of the phase transition of the composite VO2/TiO2 films by UV illumination was discussed. |
| 语种 | 中文 |
| 公开日期 | 2011-07-10 ; 2011-07-15 |
| 页码 | 71 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/4023]  |
| 专题 | 中国科学院广州能源研究所 |
| 推荐引用方式 GB/T 7714 | 郑金玉. Ag-TiO2和VO2/Ag-TiO2薄膜的制备及光致阻热性能研究, The preparation of Ag-TiO2 and VO2/Ag-TiO2 films and investigation of their photo-driven heat-preventing performance[D]. 广州能源研究所. 中国科学院广州能源研究所. 2007. |
入库方式： OAI收割
来源：广州能源研究所
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