Hydrothermal synthesis and controlled growth of group-VIB W metal compound nanostructures from tungsten oxide to tungsten disulphide. Issue 39 (27th September 2022)

• Record Type: Journal Article
• Authors: Wang, Xue; Yao, Cheng-Bao; Wang, Li-Yuan; Wang, Ze-Miao; Jiang, Cai-Hong; Liu, Xiao-Jie
• Is Part Of: Nanoscale. Volume 14:Issue 39(2022)
• Page Start: 14670
• Page End: 14682
• Publication Date: 2022-09-27
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr03786f
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A new method was developed for the construction of 2D WS2 based on an emerging synthetic route (W-O-S). The photocurrent response of WS x O y with abundant planar defects was improved ascribed to the mismatched lattice spacing between WS2 and WO3 induced strain effect. Abstract : Two-dimensional lateral group-VIB transition metal dichalcogenides (TMDs) have attracted much attention in the fast evolving field of advanced photoelectric functional materials, but their controllable fabrication is challenging. Herein, an emerging synthetic route for sulfurization of tungsten oxide was developed. During the hydrothermal reaction, the optimization of the precursor selection and synthesis parameters led to the tunable properties of WO3 –WS x O y –WS2 nanostructures. The vulcanization was thermodynamically favorably at low temperatures and in an environment with a sufficient S source, wherein WO3 was reduced by H atoms to WO3− x, and S atoms were preferentially adsorbed on O vacancies. The WS x O y nanostructures have a narrow band-gap attributed to the effect of S on the valence band top and electronic density of states by density functional theory. The photocurrent response and charge transfer properties of WS x O y were improved due to the charge transport between WS2 and WO3 . Understanding the formation and transformation of WS2 nanostructures in solution contributes to the discovery of the important structure-efficiency relationship, which may be extended to other TMDs systems. Hence, extensive research efforts are still needed to develop safer and more efficient synthesis and modification methods to fully utilize the distinctive advantageous properties of TMDs in the photoelectric field.