阳离子卟啉—石墨烯复合物的制备及光谱性质研究
发布时间：2019-05-12 17:45
【摘要】：因石墨烯具有高度的共轭结构和优良的导电性能,使之成为研究者高度关注的电子接受体。卟啉是一种光化学稳定的染敏材料,具有极强的可见光吸收和富电子特性,是一种良好的电子供体。近年来,将石墨烯与卟啉通过π-π堆积制备成复合物成为研究热点,这类复合物在光电材料、分析传感、光动力疗法等方面具有广泛的应用前景,因此,深入研究这类复合物的光谱性质,对于探明其形成机理、影响因素等具有重大的意义。在前人研究的基础上,我们在以下三方面进行了探索:第一,探究了氧化石墨烯的可控还原对石墨烯-卟啉复合物光谱性质的影响,并利用X射线衍射仪、傅里叶红外、X射线电子能谱、紫外可见吸收光谱等方法对梯度还原的氧化石墨烯及其复合物进行表征。实验结果表明:氧化石墨烯是可以梯度还原的;复合物是卟啉堆积到石墨烯上形成的。同时,研究了可控还原对复合物光谱性质的影响及复合物与不同金属离子作用的变化,揭示了梯度还原的氧化石墨烯对卟啉平面化的调节规律,并探明了梯度还原的氧化石墨烯与卟啉形成的复合物与金属离子配位难易程度。第二,通过改变卟啉衍生物的取代基证明电子效应(π-π共轭)是造成石墨烯与卟啉复合物紫外吸收红移的关键影响因素之一。由此说明静电作用、阳离子吡啶环扭曲、电子效应三者的共同作用使石墨烯-卟啉复合物紫外吸收大幅度红移。第三,初步探索了掺杂对石墨烯-卟啉复合物光谱性质的影响,发现氮的掺入量不同使得石墨烯-卟啉作用强度不同。
[Abstract]:Graphene has become an electron receptor of great concern because of its high conjugated structure and excellent electrical conductivity. Porphyrin is a kind of photochemical stable dye sensitive material, which has strong visible light absorption and electron rich properties, and is a good electron donor. In recent years, the preparation of graphene and porphyrin complexes by 蟺-蟺 stacking has become a research focus. This kind of composites have a wide range of applications in optoelectronic materials, analysis and sensing, photodynamic therapy and so on. Therefore, It is of great significance to study the spectral properties of this kind of complex in order to find out its formation mechanism and influencing factors. On the basis of previous studies, we have explored the following three aspects: first, the effect of controllable reduction of graphene oxide on the spectral properties of graphene-porphyrin complex was investigated, and X-ray diffractometer, Fourier transform infrared spectroscopy (FTIR) was used. Graphene oxide and its complexes were characterized by X-ray electron spectroscopy and UV-vis absorption spectroscopy. The experimental results show that graphene oxide can be reduced by gradient and the complex is formed by the accumulation of porphyrin on graphene. At the same time, the effect of controllable reduction on the spectral properties of the complex and the change of the interaction between the complex and different metal ions were studied, and the regulation of gradient reduced graphene oxide on the planarization of porphyrin was revealed. It is found that the complex formed by gradient reduction of graphene oxide and porphyrin is difficult to coordinate with metal ions. Secondly, it is proved that the electron effect (蟺-蟺 conjugated) is one of the key factors affecting the red shift of ultraviolet absorption of graphene and porphyrin complexes by changing the substitution groups of porphyrin derivatives. It is shown that the UV absorption of graphene-porphyrin complex shifts greatly by electrostatic interaction, distortion of cationic pyridine ring and electron effect. Thirdly, the effect of doping on the spectral properties of graphene-porphyrin complex was investigated. It was found that the interaction intensity of graphene-porphyrin was different due to the different amount of nitrogen.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
本文编号：2475575
[Abstract]:Graphene has become an electron receptor of great concern because of its high conjugated structure and excellent electrical conductivity. Porphyrin is a kind of photochemical stable dye sensitive material, which has strong visible light absorption and electron rich properties, and is a good electron donor. In recent years, the preparation of graphene and porphyrin complexes by 蟺-蟺 stacking has become a research focus. This kind of composites have a wide range of applications in optoelectronic materials, analysis and sensing, photodynamic therapy and so on. Therefore, It is of great significance to study the spectral properties of this kind of complex in order to find out its formation mechanism and influencing factors. On the basis of previous studies, we have explored the following three aspects: first, the effect of controllable reduction of graphene oxide on the spectral properties of graphene-porphyrin complex was investigated, and X-ray diffractometer, Fourier transform infrared spectroscopy (FTIR) was used. Graphene oxide and its complexes were characterized by X-ray electron spectroscopy and UV-vis absorption spectroscopy. The experimental results show that graphene oxide can be reduced by gradient and the complex is formed by the accumulation of porphyrin on graphene. At the same time, the effect of controllable reduction on the spectral properties of the complex and the change of the interaction between the complex and different metal ions were studied, and the regulation of gradient reduced graphene oxide on the planarization of porphyrin was revealed. It is found that the complex formed by gradient reduction of graphene oxide and porphyrin is difficult to coordinate with metal ions. Secondly, it is proved that the electron effect (蟺-蟺 conjugated) is one of the key factors affecting the red shift of ultraviolet absorption of graphene and porphyrin complexes by changing the substitution groups of porphyrin derivatives. It is shown that the UV absorption of graphene-porphyrin complex shifts greatly by electrostatic interaction, distortion of cationic pyridine ring and electron effect. Thirdly, the effect of doping on the spectral properties of graphene-porphyrin complex was investigated. It was found that the interaction intensity of graphene-porphyrin was different due to the different amount of nitrogen.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33
【参考文献】
相关期刊论文 前1条
1 李早英,谢征,朱训进,付世涛,刘义;水溶性季铵盐卟啉化合物与牛血清白蛋白的相互作用[J];武汉大学学报(理学版);2002年06期
，本文编号：2475575
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