石墨烯基金属卟啉复合材料的结构形貌表征及其光电化学性能

发布时间：2018-05-01 20:21

本文选题：石墨烯 + 金属卟啉配合物　；参考：《南京理工大学》2015年硕士论文

【摘要】：石墨烯作为一种新颖的纳米碳材料在许多领域得到了广泛的关注,并且有潜力应用于染料敏化太阳能电池、储能材料与锂离子电池等诸多领域。金属卟啉衍生物与叶绿素在结构上十分类似,同样具有较高的光电转化效率。将金属卟啉配合物和石墨烯进行复合制备,有望成为高性能的光电转换材料。在本论文中我们采用了一种新颖的化学方法制备了石墨烯基金属四苯基卟啉复合材料,并对此以石墨烯为基体、金属四苯基卟啉为增强体的新颖复合材料进行了结构形貌表征与光电化学性能测试。整个实验环节与步骤的具体内容如下所示：1.石墨烯基金属四苯基卟啉复合材料的设计与制备金属四苯基卟啉由毗咯与苯甲醛直接缩合再和各种金属盐(Zn, Fe, Cu, Co)进行配合而制得。最后利用金属四苯基卟啉与石墨烯之间的共轭作用力,通过改进的溶剂热法去除氧化石墨烯上大量的含氧基团制得复合材料。结构形貌测试表明石墨烯有效地控制了金属四苯基卟啉纳米粒子形成的尺寸与形貌。2.石墨烯基金属四苯基卟啉复合材料的光电性能的探究通过对复合材料光电流、光伏响应与材料阻抗特性的研究。我们发现石墨烯显著地提高了金属四苯基卟啉在紫外可见光波段的光吸收度,降低了复合材料的阻抗特性,提高了光电流响应。此现象主要归因于石墨烯与金属四苯基卟啉之间的协同作用,提高了光生电子与空穴的有效分离与电子迁移能力。
[Abstract]:Graphene, as a novel nano-carbon material, has received extensive attention in many fields, and has the potential to be used in many fields such as dye sensitized solar cells, energy storage materials and lithium-ion batteries. The metalloporphyrin derivatives are similar to chlorophyll in structure and have high photoelectric conversion efficiency. The metalloporphyrin complex and graphene are prepared, which is expected to be a high performance photoelectric conversion material. In this paper, a novel chemical method was used to prepare graphene based metal tetraphenylporphyrin composites, and graphene was used as matrix. The structure and morphology of a novel composite reinforced by tetraphenylporphyrin were characterized and its photochemical properties were tested. The details of the whole experiment and the steps are as follows: 1. Design and preparation of Graphene based Metal Tetraphenylporphyrin Composites the Tetraphenylporphyrin was synthesized by the direct condensation of pyrrolidine with benzaldehyde and the coordination of various metal salts ZnFeCuCo. Finally, by using conjugate force between tetraphenylporphyrin and graphene, the composites were prepared by a modified solvothermal method to remove a large number of oxygen-containing groups from graphene oxide. The structure and morphology test showed that graphene could effectively control the size and morphology of tetraphenylporphyrin nanoparticles. Study on the photoelectric Properties of Graphene based Metal Tetraphenylporphyrin Composites the photocurrent, photovoltaic response and impedance characteristics of the composites were studied. It is found that graphene can significantly increase the light absorption of tetraphenylporphyrin in the ultraviolet and visible band, decrease the impedance characteristics of the composites, and improve the photocurrent response. This phenomenon is mainly attributed to the synergism between graphene and tetraphenylporphyrin, which improves the effective separation and electron migration of photogenerated electrons and holes.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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