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O: Fachverband Oberflächenphysik

O 56: 2D Materials beyond Graphene

O 56.1: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-EG

Effect of different sulfur environment on sulfurization of MoO3 into MoS2 nanoflakes — •Prabhat Kumar, Megha Singh, and Gade B Reddy — Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016

In present work, Molybdenum disulfide (MoS2) nanostructured thin films (NTFs) were synthesized by sulfurizing MoO3 NTFs in three different non-conventional methods (named methods 1-3). Method 1 uses sulfur vapors, second utilizes H2S/Ar gas and third adopts plasma of H2S/Ar gas. The effect of sulfurizing ambient on its efficiency to convert MoO3 into MoS2 has been studied. And parameters such as crystallinity, purity, uniformity and stoichiometry control have been basis of this study. The samples showed uniform nanoflakes (NFs) structures throughout sample, revealed by SEM, same as their precursor MoO3. XRD and Raman disclosed crystalline MoS2 in all three methods, however the degree of crystallinity was greater in case of sulfurization in H2S/Ar plasma ambient. HR-TEM revealed formation of core-shell nanostructures comprising of MoO2 in core and MoS2 making shell. Quantitative analysis of sulfurized films carried out by XPS, shows the presence of MoS2 in methods 1,2 and 3 with percentage found to be 18%, 87% and ~100% respectively. Plasma ambient has resulted in high quality of MoS2 NTFs based on parameters such as crystallinity and stoichiometry control. Hydrogen sulfide plasma provides reducing environment as well as source of reactive sulfur species for sulfurization. The advantage of using plasma is reduced temperature and time.