Preparation Of Molybdenum Disulfide Modified By Phenylalkyne And Research On Its Optoelectrronic Device

Molybdenum disulfide?MoS₂?,whose structure is similar to the graphite,is a layed material.It has been served as car lubricant.This application is like the graphite.Recent years,due to the exfoliation of graphite into graphene,more much attention has been paid on two-dimensional materials.It has been reported that when MoS₂ is transformed from multiple layers into single layer,its bandgap changes from indirect bandgap into direct bandgap which is from 1.29 eV to 1.8 eV.The monolayer MoS₂,due to its special electronic structure,has excellent magnetic,electrical and optical properties and can be widely used in various fields.However,MoS₂ is chemical inertness and insoluble in common solvents,which extensively limits its applications,so the researchers begin to modify its structure by physical and chemical methods to change the properties of MoS₂.Physical modifications are mainly the combination of MoS₂ and some carbon materials?such as graphene and carbon nanotubes?and surface adsorption of some organic?such as amino acids?;chemical modification is that S atoms of MoS₂ combine with other atoms to form stable chemical bond,and then the properties of the modified MoS₂ were studied.MoS₂ was synthesized by hydrothermal method and characterized by SEM,XRD and Raman,which can analyze surface morphology and composition.In the experiment,MoS₂ was modified with alkynyl organometallic compound.The prepared MoS₂ was first separated into lamellas by ultrasonic method.After the ultrasonic treatment,the product was reacted with the organometallic silver compound containing alkynyl group.When reaction finished,the product was analyzed by a series of characterization methods,which showed that the surface modification of PAS was the best.We were aimed to solve the soluble problem of MoS₂,so we employed different solvents in the reaction of MoS₂ and phenyl acetylene silver.It has been found that when the solvent is N,N-dimethylformamide?DMF?,the effect of redispersion is better.The molar ratio of MoS₂ and phenyl acetylene silver was set to 1:1,1:1.5,1:2 during the experiment,respectively.It demonstrated when the molar ratio of MoS₂ and silver phenyl acetylene was 1:1.5,the surface modification effect is the best.The modified MoS₂ was combined with poly?3,4-ethylenedioxythiophene?-polyphenylene sulfonic acid?PEDOT:PSS?,which was used in the perovskite solar cell as hole transport layer.Since MoS₂-PAS is a new material,its application is still at the exploratory stage,the effect may not be obvious.