Chemical Modification And Spectral Performance Regulation Of Monolayer Molybdenum Disulfide

In recent years,two-dimensional materials have gradually become a hot research area because of their excellent optoelectronic properties.Since the appearance of layered graphene,many two-dimensional materials with different properties have been found.Among them,transition metal sulfur compounds are one of the most important materials.Due to the special structure of molybdenum disulfide,the number of layers in layered structure will change from indirect band gap to direct band gap,which makes this material have great research space in photovoltaic devices.In this paper,the optical properties of molybdenum disulfide are investigated and the optical properties of molybdenum disulfide are regulated by chemical modification.In this paper,a variety of chemical modification methods are used,including doping of precursors in growth,desulphurization under hydrogen annealing,direct reaction of iron and doping of iron salts.And the photoexcitation of benzoyl peroxide on the surface of molybdenum disulfide.Firstly,a chemical vapor deposition method was used to prepare a single layer of molybdenum disulfide with a size of 20-100 ?m.On the basis of the basic conditions of the reaction temperature,the growth base,the source of molybdenum hair and the promotion of the perylene four formic acid two potassium were studied.The whole process was analyzed,and the monolayer two sulfur was obtained.Molybdenum is directly characterized by scanning electron microscope and atomic force microscope,and the change rule of Raman and fluorescence spectra of single layer molybdenum disulfide is mainly studied.The results show that the use of perylene potassium tetrachloride and other salts as growth precursors will affect the spectral properties of molybdenum disulfide,by analyzing spectral data,It is confirmed that the change of the position and the half maximum width of the Raman peaks A1 g and E2 g of molybdenum disulfide is caused by the n-type doping of electrons.The reason why the hydrogen desulfurization reaction differs between doped and undoped samples is explained.The spectra of iron and molybdenum disulfide modified by iron salt were obtained.Finally,the patterning reaction of molybdenum disulfide monolayer was carried out by photoexcitation of benzoyl peroxide,and the conclusion that molybdenum disulfide promoted the decomposition of benzoyl peroxide was obtained.The patterned Raman and fluorescence spectra were obtained by microscanning.