Synthesis Of Nitrogen-doped Graphene And Its Composite With Molybdenum Disulfide

In the eyes of many researchers, graphene is a super star. Due to its excellent performance, graphene is widely used in various fields. However, graphene is a zero band gap semiconductor. It is different from the traditional semiconductor, graphene can not be controlled by its conductive type. And it is difficult to combine graphene with other metal particles. All of these limit the use of graphene. It can be a useful way to change the crystal structure and properties of graphene that modified the graphene in chemical method, especially the chemical doping. The main doping atoms are nitrogen atoms and boron atoms, because they are the most similar in grain size with graphene. This paper choose the nitrogen doping for the modification of graphene.First, this paper used the modified Hummers method to prepare the oxide graphene(GO), and then the GO used as the precursor, and the urea and thiourea used as the source of nitrogen to prepare the nitrogen-doped oxide graphene(NGO). The method to prepare the NGO is hydrothermal synthesis method. At last the SEM, XRD, Raman and FT-IR were used to character the NGO.The method used in this paper to dope nitrogen is hydrothermal synthesis method. The SEM diagram of NGO which doped by urea represents the crumpled layer structure, and it can be known that with the increase of the reaction temperature and the increase of the urea content, the effect of nitrogen incorporation was better through the XRD, Raman, and FT-IR characterization methods. At the same time, the reunion phenomenon of the nitrogen-doped oxide graphene aggravate gradually. The surface morphology of NGO which doped by thiourea was a type of card of stack structure. And with the increase of the thiourea content, the effect of nitrogen incorporation was better. The experiment also proved that time was not the import factor for this experiment. The reunion phenomenon of the nitrogen-doped oxide graphene was also appeared in the NGO which doped by thiourea.Due to the similarities in structure and the complementarity in electrical performance between molybdenum disulfide and graphene, molybdenum disulfide and oxide graphene was expected to be used for this compound experiment. This experiment was also used the method of hydrothermal synthesis. The surface morphology of the final composite products presented the uniform distribution. And the molybdenum disulfide became grain refinement, and improved the reunion phenomenon of the nitrogen-doped oxide graphene. In the analysis of XRD, the amorphous structure of Mo S2 particles was got.At last, the nitrogen-doped oxide graphene was applied in photodetector, By measuring the external quantum efficiency analysis, dark current and response time of photodetector, it is concluded that the use of the nitrogen-doped oxide graphene to modify ITO can make the properties of photodetector improved.