研究目的
The aim of this work is to study the effect of MoS2 flakes size on its optical and electrochemical properties.
研究成果
The optical band gap and areal capacitance of MoS2 increase with decreasing flakes size. The small flake size samples showed lower number of layers, indicating higher surface area and more electrochemical active edges. These findings recommend that MoS2 can be the excellent electrode material for supercapacitor.
研究不足
The study focuses on the effect of flakes size on optical and electrochemical properties, but does not explore the potential effects of other factors such as temperature or pressure during exfoliation.
1：Experimental Design and Method Selection:
MoS2 with different flakes sizes were prepared by exfoliation method. The exfoliation was performed by sonication of MoS2 powder in N,N-Dimethylformamide followed by different centrifugation speeds.
2：Sample Selection and Data Sources:
Commercial MoS2 powder (99%, <2 μm, Sigma-Aldrich) was used.
3：List of Experimental Equipment and Materials:
Ultrasonic bath (Branson 3800 Ultrasonic), UV-Vis spectrometer (Thermo Fisher Scientific; model 4001/4), potentiostat/galvanostat (AUTOLAB; PGSTAT101).
4：1). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The dispersion was centrifuged at different speeds to separate MoS2 flakes of different sizes. UV-Vis spectroscopy and cyclic voltammetry were used to study the optical and electrochemical properties.
5：Data Analysis Methods:
The optical band gap values were calculated from Tauc plots. The areal capacitance was calculated by integration of the area under CV curves.
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