Utilizing the Connors-Wright Equation to Prepare an Appropriate Binary Solution in order to Use in LPE Process
Paper ID : 1441-ICNS
Authors:
Najme Sadat Taghavi *, Reza Afzalzadeh
K. N. Toosi University of Technology
Abstract:
Molybdenum Disulfide (MoS2) is one of Transition Metal Dichalcogenides (TMDs). These are one of the most studied families of layered materials. Because of the simplicity and cheapness, ultrasonication in a liquid is an important technique for the exfoliation of 2D materials. The obtained nanoflakes should be characterized by different methods (like UV-Visible and Raman Spectroscopy). In this work, we prepared the 2D nanosheets of MoS2 via Liquid Phase Exfoliation (LPE) method in various solutions. Our findings from UV-Visible spectroscopy show that the minimum thickness of MoS2 nanoflakes is obtained for the solution with the surface tension of γ=40mN/m. For a 2-component (binary) solution (like water/ethanol solution), calculating the surface tension of the mixture is an important step of the study. We successfully utilized the Connors-Wright equation to find the proper amount of each component to get γ=40mN/m. The Raman spectra confirmed that we obtained the few- (and even mono-) layers of MoS2.
Keywords:
MoS2 nanoflakes; LPE method; surface tension; bandgap; thickness of layers.
Status : Abstract Accepted (Poster Presentation)