Study On The Preparation And Application Of 1T Phase Molybdenum Disulfide

As a graphene-like material,molybdenum disulfide has received great attention due to its unique structure and properties.It is currently widely used in energy storage,sensing,optoelectronics and other fields.The 1T-phase molybdenum disulfide（1T-MoS₂）has better conductivity and hydrophilicity than the 2H-phase molybdenum disulfide（2H-MoS₂）,enabling it to be used in electrochemical energy storage,gas/humidity sensing,etc.Greater potential.In this thesis,1T-MoS₂ and 1T-MoS₂ composite materials were synthesized by hydrothermal method and applied to humidity-sensitive sensing and supercapacitors.The main research work and results are as follows:（1）Using ammonium molybdate tetrahydrate as the source of molybdenum and thiourea as the source of sulfur,1T-MoS₂ was prepared by hydrothermal method at 180℃,12 h,and the molar ratio of molybdenum to sulfur of 1:5.Its morphology and structure were characterized by scanning electron microscopy（SEM）and X-ray diffraction spectroscopy（XRD）;its 1T phase was characterized by Raman spectroscopy and X-ray photoelectron spectroscopy（XPS）;The water contact angle test characterizes its hydrophilicity;the results show that the content of 1T-MoS₂ is about 83%;the hydrophilicity of 1T-MoS₂ is better than that of 2H-MoS₂.（2）Using 1T-MoS₂ as a moisture-sensitive material,a moisture-sensitive sensor with a Teslin paper base as a flexible substrate was fabricated.The humidity sensitivity characteristics of the sensor were tested,and the results showed that the humidity sensor is a resistance type,has a wide humidity range（11%RH-95%RH）,has a faster response-recovery speed,and has good device stability.Combined with its AC impedance spectroscopy under high,middle and low humidity,the humidity sensing mechanism is analyzed.（3）In order to improve the electrochemical performance of 1T-MoS₂,it is compounded with Carbon Cloth（CC）.Using a three-factor three-level orthogonal test,with the specific capacitance value as the evaluation index,the system explored the effects of temperature,reaction time,and molybdenum-sulfur molar ratio on the capacitance performance of the hydrothermally synthesized MoS₂/CC composite material.The results showed that the optimized reaction conditions It is:180℃,12 h,1:5.Under this reaction condition,1T-MoS₂/CC composite material was successfully prepared by one-step hydrothermal method.The morphology and structure were characterized by SEM,XRD,and Raman spectroscopy.By observing the characteristic peaks of the Raman spectrum,it was confirmed that the crystalline phase of MoS₂ in the composite material was 1T phase.The SEM test results show that under the optimized reaction conditions,1T-MoS₂ grows uniformly on the surface of the carbon cloth without stacking.1T-MoS₂/CC was directly applied to supercapacitor electrodes,and its electrochemical performance was tested.Under 1A/g current density,its mass specific capacitance can reach 386.4 F/g,after 1000 cycles,its capacitance retention rate is 75.1%.Tested its rate characteristics under different current densities（1 A/g,2 A/g,3 A/g,5 A/g,8 A/g）,the shape of the GCD curve is still triangular,basically unchanged,Indicates that the energy storage mechanism is still an electric double layer capacitor.