Abstract
From recent investigations, these compounds of transition-metal dichalcogenides, TX2 where T=W or Mo and X=S or Se have been attractive in a variety of important technologies such as solid lubricants, photovoltaic solar cells, hydrosulphurization catalysts etc. Despite their various technological applications, the theoretical and experimental understanding of the solid-state properties of WS2 are still relatively incomplete.Our current effort has been on the effect of WS2 properties. Single crystals of WS2 are grown using the chemical vapor transport method with Br2 as the transport agent. The XPS spectra of W 4f and S 2p core electron are defined and the chemical states of tungsten and sulfide are discussed for the WS2 single crystal.
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