Abstarct: Transition mextal Dichalcogenide (TMDC) such as MoS2, MoSe2, NbS2, NbSe2, WS2 and WSe2 have attracted special attention due to unique electronic and optical properties. These materials have wide bandgaps and it changes from direct to indirect when the material was synthesized in single laxyers. Some of the important applications of these materials are in the fabrication of gas sensors, solar cells, photodetectors devices. Tungsten disulfide (WS2) has a higher heat constant and a higher heat capacity than other chalcogenides. WS2 has Van der Waals bonding between laxyers, and in a laxyer-type, structure has been crystallized. WS2 has a direct bandgap in the visible light spectrum. The purpose of this thesis is the synthesis and characterization of WS2 nanostructures. For this purpose, after a brief introduction of nanostructures, the structure and properties of tungsten disulfide nanostructure are investigated. Then RF sputter coater grew polycrystalline WS2 films and a thin laxyer of a thickness of 200 nm was formed on the glass substrate at 350 ˚C. In order to investigate the characteristics of the formed laxyer, XRD, FESEM, Raman spectroscopy, UV-Vis have been used. XRD analysis of the sample with the power of 80 and 100 W revealed the amorphous structure of the material, while mextal oxide crystallization occurred in the sample with the power of 120 W. The EDX analysis revealed the presence of W and S elements in the synthesized samples. The gas sensing results showed that the response time and recovery time decreased with increasing power. The highest sensitivity to ethanol gas is 34.17%, in the sample with the power of 120 W. The response and recovery time of the sample are 7 and 3 seconds, respectively.