Preparation And Properties Characterization Of Rhenium Disulfide Nanofilm And Nanopowder On Si Substrate

Since the advent of graphene materials,more and more researchers pay attention to the two-dimensional materials because of their excellent properties such as high electrical conductivity and high thermal conductivity.Nowadays,optoelectronic devices are developing in the direction of high integration and high performance,which puts forward higher requirements for the existing two-dimensional nano materials.however,the traditional graphene material is a zero-band gap structure,which makes it unable to meet the application requirements in the field of optoelectronics.Due to the limitations of the performance of traditional materials,new transition metal chalcogenides?TMDs?have many unique and electrical properties,and gradually become a new research hotspot.Among them,rhenium disulfide?ReS₂?has a direct band gap because of its unique layered structure and also,it has a wide range of applications and prospects in photovoltaics.However,it is difficult to achieve controlled growth,the currently prepared ReS₂ is too small in size and uneven in thickness.Therefore,this article takes ReS₂ film and ReS₂ powder as the research object.First ReS₂ film was prepared on the Si O₂/Si substrate,further the controllable preparation and growth mechanism of ReS₂ film were studied.then ReS₂ powder was prepared by hydrothermal method,and the properties of the powder before and after calcination was characterized;and finally the electrocatalytic hydrogen evolution performance of ReS₂was tested.The main research contents and results are as follows:ReS₂ thin films were prepared by chemical vapor deposition.The experiment uses silica/silicon as the substrate,rhenium powder and sulfur powder as the rhenium source and sulfur source,and tellurium powder as the auxiliary agent.It is mixed with rhenium powder to reduce the melting point of metal rhenium.Under argon atmosphere,rhenium powder and sulfur powder sublime into the gas phase,react to form ReS₂,and deposit on the target substrate.Scanning Electron Microscopy found that the average thickness of ReS₂ nanosheets is 0.2?m,the average length is 20?m,and the area of a single nanosheet is about 20?m×20?m.X-ray Diffraction,Raman spectroscopy,X-ray Photoelectron Spectroscopy and other characteristics prove that the product is rhenium disulfide,and the product contains no Te element,and the sample thickness is well-distributed.Finally,by controlling the rhenium-tellurium specific gravity,substrate type,growth temperature,substrate placement and other experimental parameters,the effects of the above experimental parameters on the growth of the ReS₂ film were explored,and the optimal growth conditions of the ReS₂ film were summarized and analyzed.The ReS₂ powder was prepared by hydrothermal method.The experiment selected ammonium perrhenate and thiourea as the rhenium source and sulfur source.Hydroxylamine hydrochloride as the reducing agent was added to the mixed solution.Scanning electron microscopy showed that the morphology of the prepared ReS₂ powder was nano-flowered and nano-spherical,with a diameter between 30?m and 50?m.After calcination,the morphology of the sample was close to pine and thick flakes with a diameter of about 1?m to 2?m.Finally,it was tested for electrocatalytic performance.The experiment showed that the initial overcharge of ReS₂ was about-177 m V vs.RHE and the slope of Tafel was about 184.6 m V/dec,indicating that ReS₂ has certain electrocatalytic performance.