【摘要】：因石墨烯具有高度的共軛結構和優(yōu)良的導電性能,使之成為研究者高度關注的電子接受體。卟啉是一種光化學穩(wěn)定的染敏材料,具有極強的可見光吸收和富電子特性,是一種良好的電子供體。近年來,將石墨烯與卟啉通過π-π堆積制備成復合物成為研究熱點,這類復合物在光電材料、分析傳感、光動力療法等方面具有廣泛的應用前景,因此,深入研究這類復合物的光譜性質,對于探明其形成機理、影響因素等具有重大的意義。在前人研究的基礎上,我們在以下三方面進行了探索:第一,探究了氧化石墨烯的可控還原對石墨烯-卟啉復合物光譜性質的影響,并利用X射線衍射儀、傅里葉紅外、X射線電子能譜、紫外可見吸收光譜等方法對梯度還原的氧化石墨烯及其復合物進行表征。實驗結果表明:氧化石墨烯是可以梯度還原的;復合物是卟啉堆積到石墨烯上形成的。同時,研究了可控還原對復合物光譜性質的影響及復合物與不同金屬離子作用的變化,揭示了梯度還原的氧化石墨烯對卟啉平面化的調(diào)節(jié)規(guī)律,并探明了梯度還原的氧化石墨烯與卟啉形成的復合物與金屬離子配位難易程度。第二,通過改變卟啉衍生物的取代基證明電子效應(π-π共軛)是造成石墨烯與卟啉復合物紫外吸收紅移的關鍵影響因素之一。由此說明靜電作用、陽離子吡啶環(huán)扭曲、電子效應三者的共同作用使石墨烯-卟啉復合物紫外吸收大幅度紅移。第三,初步探索了摻雜對石墨烯-卟啉復合物光譜性質的影響,發(fā)現(xiàn)氮的摻入量不同使得石墨烯-卟啉作用強度不同。
[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.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB33

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相關期刊論文 前1條

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