Abstract
Polycrystalline molybdenum disulphide has been grown by high pressure (about 54.88 × 10 6 N m −2) reduction of molybdenum trisulphide and characterized by various physicochemical methods. The chemical analysis of the compound established a sulphur to molybdenum ratio of 2, which was also confirmed by thermogravimetric analysis in air. The X-ray data was found to be consistent with 2H-MoS 2, n-type conductivity ( S = −275 μV °C −1) and diamagnetic behaviour ( χ m = −0.049 × 10 −6 c.g.s. e.m.u.). It is a semiconducting material with a room temperature conductivity of of 1.2 × 10 −4 Ω −1 cm −1 and an activation energy of 0.124 eV in the temperature range 150–300 K. A band gap of 0.95 ± 0.02 eV was found from optical absorption studies on a thin MoS 2 film. Thermal studies of MoS 2 in an argon atmosphere has shown its stability up to 1200 °C and thereafter it decomposes to Mo 2S 3. A model has been proposed which describes the thermal behaviour of MoS 2 when heated at various temperatures up to 1200 °C and is based on the appearance of lines in X-ray powder diffractogram of the product resulting from the crystallization of MoS 2. Scanning electron microscope studies have also been made.
Published Version
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