期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 21, 期 45, 页码 25139-25147出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cp01890e
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The oxidation behaviour of tungsten disulphide (WS2) nanosheet powder with an average thickness of about 10 nm was studied in the temperature range of 25-700 degrees C. The samples were subjected to exposure in air in a short continuous mode as well as extended isothermal holding. It was observed that WS2 nanosheets were stable below 350 degrees C in air for short exposure times. A two-dimensional WS2/WO3 heterostructure evolved at 350 degrees C on short exposures to the oxidising atmosphere. Complete oxidation of WS2 nanosheets was observed at a temperature of about 450 degrees C in the continuous heating mode and at 350 degrees C under isothermal holding for an extended exposure time. During oxidation, WS2 nanosheets were initially transformed to 2D-WO3 nanosheets with an average thickness of about 10 nm. Significant distortion in the monoclinic structure of 2D-WO3 was observed. At higher temperatures, the WO3 nanosheets disintegrated initially to rod-shaped WO3 particles, which were subsequently transformed to thermodynamically stable spherical shaped WO3 nanoparticles.
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