刺激响应性光子晶体材料的制备
发布时间：2019-04-21 12:51
【摘要】：光子晶体是一种超材料,其独特的结构可以形成光子带隙,对电磁波进行调控。利用此原理我们可以将功能材料通过分子印迹技术与光子晶体结合,制备出具有响应功能的光子晶体材料,把刺激响应材料在应答过程中发出的化学信号或者体积等变化转化为光学信号,便于检测,这在传感和检测领域有着十分广阔的应用前景。光子晶体的特殊结构还可以对量子点的荧光性能进行调控,孔穴结构可以使荧光过程的热交换效率变高,从而增强量子点的荧光性能,这对于生物标记和半导体器件领域也有重要的意义。本文具体的研究内容和结果如下:采用stober法在氨水提供的碱性条件下水解TEOS形成SiO_2微球,得到的微球单分散性好、粒径可控,采用乳液聚合法聚合苯乙烯单体制备聚苯乙烯微球,得到的微球单分散性好、球形度高,采用垂直沉降自组装法使微球在溶剂挥发的过程中自组装于基片上,形成蛋白石结构光子晶体结构,光子晶体的表面完整、无明显缺陷、结构色明显,适合作为反蛋白石结构光子晶体的模板材料。将分子印迹技术引入光子晶体材料,制备出甲基丙烯酸反蛋白石结构的光子晶体。经测试,反蛋白结构光子晶体对温度、溶剂浓度和盐离子浓度都具有响应功能,随着温度的升高衍射峰红移,强度增高;随着乙醇溶剂浓度的升高衍射峰强度变高;随着盐离子浓度增加衍射峰蓝移。以丙烯酰胺为功能单体制备出光子晶体水凝胶,凝胶作为骨架材料在发生膨胀及收缩时会直接影响微球的晶格间距,从而改变结构色,经测试其对温度以及PH具有响应效果,并且衍射峰的变化较大,颜色变化肉眼可以识别。采用水溶液合成法制备CdTe量子点水溶液,量子点的粒径大小随着回流时间增加而变大,并且发射光谱红移。调节到不同的浓度得到了最佳荧光效果浓度为1mmol/L。将量子点与光子晶体结合形成复合薄膜,比较荧光性能发现光子晶体的结构可以提升量子点的荧光强度。综上所述,本文成功制备出了SiO_2和聚苯乙烯蛋白石结构光子晶体,优化了反应条件,进行了性能研究;制备出甲基丙烯酸反蛋白结构光子晶体,并对其进行了刺激响应测试;制备出了CdTe量子点并将其与光子晶体的特殊结构结合,对其荧光性能的调控进行研究。希望我们的工作可以在光子晶体领域提供借鉴方法,并拓展其在检测传感领域的应用。
[Abstract]:Photonic crystal is a kind of supermaterial. Its unique structure can form photonic band gap and regulate electromagnetic wave. Based on this principle, we can combine functional materials with photonic crystals by molecular imprinting technology to prepare photonic crystal materials with response function. The change of chemical signal or volume of stimulus response material in response process can be transformed into optical signal, which is easy to detect, which has a very broad application prospect in the field of sensing and detection. The special structure of photonic crystal can also regulate the fluorescence properties of quantum dots. The hole structure can increase the heat exchange efficiency of the fluorescence process, thus enhancing the fluorescence properties of quantum dots. This is also of great significance in the field of biomarkers and semiconductor devices. The specific contents and results of this paper are as follows: the stober method was used to hydrolyze TEOS to form SiO_2 microspheres under the alkaline condition provided by ammonia. The obtained microspheres have good monodispersity and controllable particle size. Polystyrene microspheres were prepared by emulsion polymerization of styrene monomer. The microspheres were prepared with good monodispersity and high sphericity. The microspheres were self-assembled on the substrate in the process of solvent volatilization by vertical deposition self-assembly method. The photonic crystal with opal structure has complete surface, no obvious defect and obvious color, so it is suitable to be used as template material for anti-opal photonic crystal. The molecular imprinting technique was introduced into the photonic crystal material to prepare the photonic crystal with anti-opal structure of methacrylic acid. The results show that the anti-protein photonic crystal has the response function to temperature, solvent concentration and salt ion concentration, and the diffraction peak intensity increases with the increase of temperature, and the intensity of diffraction peak increases with the increase of ethanol solvent concentration, and the anti-protein structure photonic crystal has the function of response to temperature, solvent concentration and salt ion concentration. With the increase of salt ion concentration, the diffraction peaks shift blue. Photonic crystal hydrogels were prepared by using acrylamide as a functional monomer. As a skeleton material, photonic crystal hydrogels can directly affect the lattice spacing of microspheres when they expand and contract, thus changing the structure color. The results show that the hydrogels can respond to temperature and PH. And the change of diffraction peak is larger, the color change can be recognized by the naked eye. The aqueous solution of CdTe quantum dots was prepared by aqueous solution synthesis. The particle size of quantum dots increased with the increase of reflux time, and the emission spectra were red-shifted. The optimal concentration of fluorescence was 1 mmol / L 路L-1 路mol 路L-1. By combining quantum dots with photonic crystals to form composite films, it is found that the structure of photonic crystals can enhance the fluorescence intensity of quantum dots. In conclusion, SiO_2 and polystyrene opal photonic crystals have been successfully prepared in this paper. The reaction conditions have been optimized and the properties of the crystals have been studied. The anti-protein structure photonic crystal of methacrylic acid was prepared and its stimulus response was tested, and the CdTe quantum dot was prepared and combined with the special structure of photonic crystal, and the regulation of its fluorescence performance was studied. We hope that our work can be used for reference in the field of photonic crystals and expand its application in the field of sensing.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O734
本文编号：2462218
[Abstract]:Photonic crystal is a kind of supermaterial. Its unique structure can form photonic band gap and regulate electromagnetic wave. Based on this principle, we can combine functional materials with photonic crystals by molecular imprinting technology to prepare photonic crystal materials with response function. The change of chemical signal or volume of stimulus response material in response process can be transformed into optical signal, which is easy to detect, which has a very broad application prospect in the field of sensing and detection. The special structure of photonic crystal can also regulate the fluorescence properties of quantum dots. The hole structure can increase the heat exchange efficiency of the fluorescence process, thus enhancing the fluorescence properties of quantum dots. This is also of great significance in the field of biomarkers and semiconductor devices. The specific contents and results of this paper are as follows: the stober method was used to hydrolyze TEOS to form SiO_2 microspheres under the alkaline condition provided by ammonia. The obtained microspheres have good monodispersity and controllable particle size. Polystyrene microspheres were prepared by emulsion polymerization of styrene monomer. The microspheres were prepared with good monodispersity and high sphericity. The microspheres were self-assembled on the substrate in the process of solvent volatilization by vertical deposition self-assembly method. The photonic crystal with opal structure has complete surface, no obvious defect and obvious color, so it is suitable to be used as template material for anti-opal photonic crystal. The molecular imprinting technique was introduced into the photonic crystal material to prepare the photonic crystal with anti-opal structure of methacrylic acid. The results show that the anti-protein photonic crystal has the response function to temperature, solvent concentration and salt ion concentration, and the diffraction peak intensity increases with the increase of temperature, and the intensity of diffraction peak increases with the increase of ethanol solvent concentration, and the anti-protein structure photonic crystal has the function of response to temperature, solvent concentration and salt ion concentration. With the increase of salt ion concentration, the diffraction peaks shift blue. Photonic crystal hydrogels were prepared by using acrylamide as a functional monomer. As a skeleton material, photonic crystal hydrogels can directly affect the lattice spacing of microspheres when they expand and contract, thus changing the structure color. The results show that the hydrogels can respond to temperature and PH. And the change of diffraction peak is larger, the color change can be recognized by the naked eye. The aqueous solution of CdTe quantum dots was prepared by aqueous solution synthesis. The particle size of quantum dots increased with the increase of reflux time, and the emission spectra were red-shifted. The optimal concentration of fluorescence was 1 mmol / L 路L-1 路mol 路L-1. By combining quantum dots with photonic crystals to form composite films, it is found that the structure of photonic crystals can enhance the fluorescence intensity of quantum dots. In conclusion, SiO_2 and polystyrene opal photonic crystals have been successfully prepared in this paper. The reaction conditions have been optimized and the properties of the crystals have been studied. The anti-protein structure photonic crystal of methacrylic acid was prepared and its stimulus response was tested, and the CdTe quantum dot was prepared and combined with the special structure of photonic crystal, and the regulation of its fluorescence performance was studied. We hope that our work can be used for reference in the field of photonic crystals and expand its application in the field of sensing.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O734
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