| 题名 | 用于蓝光激光直写的聚乙烯醇/银纳米复合材料的制备和光学性能研究 |
| 作者 | 宋晶 |
| 学位类别 | 硕士 |
| 答辩日期 | 2012 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 耿永友 |
| 关键词 | 激光直写 复合材料 银纳米颗粒 聚乙烯醇 紫外光辐照 |
| 其他题名 | Preparation and 0ptical Property of Polyvinyl Alcohol (PVA) / Siver (Ag) Nanocomposite Film for Laser Direct Write |
| 中文摘要 | 聚乙烯醇/银纳米复合材料结合了金属的特性和聚合物的加工性能，为发展性能改进的新型激光直写材料开辟一条新的路径。 本文首先系统介绍了纳米材料的基本效应、制备方法和一些光谱性质，然后介绍了贵金属纳米银的发展史、等离子共振特性和一些应用，重点综述了纳米银化学还原和光还原的制备方法。最后介绍了激光直写技术和材料，以及非线性光学效应。 本文利用紫外光诱导还原金属前躯体硝酸银（AgNO3），直接在聚乙烯醇(PVA)薄膜中生长银纳米颗粒，成功制备出 PVA/Ag纳米复合材料薄膜。利用紫外可见吸收光谱分析了银离子浓度，紫外光辐照功率和辐照时间对薄膜光谱的影响趋势。通过优化硝酸银浓度、辐照条件来调节薄膜中银纳米颗粒的尺寸和空间分布密度，成功地将此复合薄膜的等离子共振吸收峰位调节为406 nm，并用于蓝光（405nm）激光直写光刻。原子力显微镜（AFM）分析显示薄膜光刻后获得了表面清晰、光滑、规整的图形。 扫描电子显微镜（SEM）表明，该材料中纳米颗粒分布均匀，粒径分布较窄。X射线光电子谱（XPS）证实了合成的纳米颗粒为单质银，元素成分分析表明材料经紫外光辐照后发生了脱氧反应；X射线衍射分析（XRD）表明紫外光降低了聚乙烯醇的结晶度。 热分析表明，材料内部存在7.7%的水，玻璃化转变温度在82℃左右，200℃发生热分解，以此分析了热分解机理。红外光谱和拉曼光谱表明紫外光辐照后聚乙烯醇基体有碳碳双键和羰基生成，并存在共轭结构，由此分析了光还原反应机理；利用拉曼光谱研究了聚乙烯醇/银纳米复合材料的拉曼增强效应。 研究了材料的非线性吸收特性，发现其非线性吸收系数很大，在10-3到10-2m/W数量级，且随着银量的增加显著增大。 |
| 英文摘要 | Polyvinyl Alcohol/Siver Nanocomposite, combining the advantages of the metal particles and the processability of the polymers, opened a new gateway in developing new materials with improved performances for laser direct write. This dissertation first introduces the basic effects, the preparaton method and some optical spectrum properties of nanomaterials systemly. Then it inroduces the development history , surface plasmon resonance and some applycation of noble metal nano-silver. The chemical-reduction method and photoreduction method to prepare nano-silver，laser direct write technique and material and optical nonlinear effects are reviewed. Polyvinyl alcohol (PVA)/Ag hybrid nanocomposite films are successfully prepared. Silver nanoparticles are generated directly in PVA matrix by reduction of metallic precursor silver nitrate (AgNO3) with UV-irradiation. UV–visible spectra of the films shows effects of silver ion concentration, irradiation power and irradiation time on preparation of silver nanoparticles. Size and space distribution density of the Ag nanoparticles can be controlled by varing irradiation condition conbined with adjusting concentration of Ag+ ion. So surface plasmon resonance peak of the film can be shifted to 406nm, matching very well with laser wavelength of 405nm in optical writing system. AFM scans reveal that laser direct write carries out successfully on the films. The clear slick and concinnous pattern is written on the surface of the films by laser. SEM images show narrowsize distribution and uniform, intensive, relatively independent dispersion of the obtained nanoparticles. XPS analysis reveals the nano particles are the pure silver and deoxidation reaction occurred in the nanocomposite after UV light. XRD reveals that the degree of crystallinity of PVA decreased with the enhancement of UV light irradiant time and power. Thermal analysis tells us that the nanocomposite cntains 7.7 w.t.% water. The glass-transition temperature is about 82 ℃. Thermolysis occures at 200℃. Infrared spectrum and laman Raman spectrum demonstrate that carbodouble bond and carbonyl group are generated after UV light irradiation,meanwhile which can exist as a form of conjugate structure. Photoreduction mechanism is discussed. Surface enhancement laman effect of the PVA/Ag nanocomposite is studied with using laman spectrum. Non-linear absorbance coefficient of this nanocoposite is studied and shows large value at the range of 10-2 m/W to 10-3 m/W, which is increased dramatically with the rising of silver amount. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16731]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 宋晶. 用于蓝光激光直写的聚乙烯醇/银纳米复合材料的制备和光学性能研究[D]. 中国科学院上海光学精密机械研究所. 2012. |
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