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

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2019年 / 21卷 / 45期

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

页码：25139 / 25147

页数：9

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