Oxidation of 2D-WS2 nanosheets for generation of 2D-WS2/WO3 heterostructure and 2D and nanospherical WO3

被引:23
作者
Adigilli, Harish Kumar [1 ]
Padya, Balaji [1 ]
Venkatesh, L. [1 ]
Chakravadhanula, V. S. K. [1 ,3 ]
Pandey, A. K. [2 ]
Joardar, Joydip [1 ]
机构
[1] Int Adv Res Ctr Powder Met & New Mat ARCI, PO Balapur, Hyderabad 500005, Telangana, India
[2] Natl Inst Technol, Warangal 506004, Andhra Pradesh, India
[3] Indian Space Res Org, Vikram Sarabhai Space Ctr, Mat Characterisat Div, Thiruvananthapuram 695022, Kerala, India
关键词
GAS-SENSING PROPERTIES; EFFICIENT ELECTROCATALYST; PHASE-TRANSITIONS; THERMAL-EXPANSION; WS2; NANOSHEETS; MOS2; PERFORMANCE; NANOPARTICLES; STABILITY; COMPOSITE;
D O I
10.1039/c9cp01890e
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:25139 / 25147
页数:9
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