Few-Layer and Two-dimensional MoS2 Nanosheets Stripped by Molybdenite and Its Gas Sensing Properties Study for NH3
In order to explore the gas sensitive characteristics of two-dimensional MoS2 nanosheets to NH3,few-layer and two-dimensional MoS2 nanosheets were prepared by liquid phase ultrasonic stripping method with molybdenite as raw material and ethanol aqueous solution as the stripping solvent.The phase composition and microstructure of MoS2 nanosheets were char-acterized and analyzed by XRD,UV-vis,SEM and AFM,and NH3 gas sensitive characteristics of MoS2 nanosheets were studied by static gas distribution method.The result showed that:① the irregular and lamellar MoS2 nanosheets were 4~5 layers in lay-er number,about 200 nm in size,and about 5 nm in thickness,demonstrating a large specific surface area.② It illustrated that MoS2 nanosheets had good response and recovery characteristics to NH3 and the maximum sensor response was achieved at 100℃.Meanwhile,MoS2 nanosheets showed excellent reproducibility and stability.③ The reaction between NH3 gas and adsorbed oxygen on the surface of MoS2 nanosheets resulted in the change in thickness of hole accumulation layer,leading to a change in resistance of the obtained MoS2 nanosheets and realizing the gas sensing response.The results showed that the MoS2 nanosheets prepared by liquid phase ultrasonic stripping method have fewer layers and better dispersion,and have good gas sensing proper-ties for NH3 gas.
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