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Flakes Size-Dependent Optical and Electrochemical Properties of MoS2

Aboelazm, Eslam A. A. and Ali, Gomaa A. M. and Algarni, H. and K. F., Chong (2018) Flakes Size-Dependent Optical and Electrochemical Properties of MoS2. Current Nanoscience, 14 (5). pp. 416-420. ISSN 1573-4137 (Print); 1875-6786 (Online)

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Abstract

Background: Molybdenum disulfide (MoS2) is a transition metal dichalcogenides and has some interesting and promising properties. MoS2 has direct and indirect band gaps depending on its crystalline structure. In addition, its sheets morphology makes it a good candidate for supercapacitor applications. Objective: The aim of this work is to study the effect of MoS2 flakes size on its optical and electrochemical properties. Method: 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. UV-Vis spectra illustrated the optical energy gap was inversely proportional to the MoS2 flakes size. Results: Absorption coefficient values indicated that the exfoliation reduced the number of layers. Symmetric supercapacitor was made from two MoS2 electrodes and tested in 6 M KOH electrolyte. The specific capacitance was found to be dramatically increased with decreasing flakes size (9.5 and 4.5 mF/cm2 for 0.26 and 0.98 µm flakes size, respectively). Conclusion: These findings recommend that MoS2 can be the excellent electrode material for supercapacitor.

Item Type: Article
Uncontrolled Keywords: Molybdenum disulfide, nanoflakes, optical band gap, supercapacitors, cyclic voltammetry, Transition Metal Dichalcogenides (TMDs)
Subjects: Q Science > QD Chemistry
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Noorul Farina Arifin
Date Deposited: 18 Sep 2018 04:14
Last Modified: 18 Sep 2018 04:14
URI: http://umpir.ump.edu.my/id/eprint/22120
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