Oxidation of 2D-WS2 nanosheets for generation of 2D-WS2/WO3 heterostructure and 2D and nanospherical WO3
- Resource Type
- Authors
- Joydip Joardar; Balaji Padya; L. Venkatesh; Venkata Sai Kiran Chakravadhanula; Ajoy Kumar Pandey; Harish Kumar Adigilli
- Source
- Physical Chemistry Chemical Physics. 21:25139-25147
- Subject
- Materials science
General Physics and Astronomy
Nanoparticle
chemistry.chemical_element
Heterojunction
02 engineering and technology
Continuous mode
Tungsten
Atmospheric temperature range
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Isothermal process
0104 chemical sciences
chemistry
Chemical engineering
Physical and Theoretical Chemistry
0210 nano-technology
Monoclinic crystal system
Nanosheet
- Language
- ISSN
- 1463-9084
1463-9076
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 °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 °C in air for short exposure times. A two-dimensional WS2/WO3 heterostructure evolved at 350 °C on short exposures to the oxidising atmosphere. Complete oxidation of WS2 nanosheets was observed at a temperature of about 450 °C in the continuous heating mode and at 350 °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.