Antioxidant Triggered Metallic 1T' Phase Transformations of Chemically Exfoliated Tungsten Disulfide (WS2) Nanosheets. Issue 12 (10th February 2022)

• Record Type: Journal Article
• Authors: Kim, Jun Yeob; Chae, Soosang; Jang, Woosun; Besford, Quinn A.; Oh, Jin Young; Lee, Tae Il
• Is Part Of: Small. Volume 18:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-10
• Subjects: antioxidants -- chemically exfoliated nanosheets -- lithium -- phase transformations -- thermoelectrics -- tungsten disulfide (WS 2); Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202107557
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Developing facile methods for inducing phase transformation between metallic and semiconducting 2D transition metal dichalcogenide (TMDC) materials is crucial toward leveraging their use in cutting‐edge energy devices. Herein, 2H‐to‐1T' phase transformations in chemically exfoliated Tungsten Disulfide (WS2 ) nanosheet films, triggered by antioxidants toward highly conductive 2D TMDC electrode materials, are introduced. It is found that antioxidants cause residual LiOx compounds to reduce to Li metal, subsequently inducing 1T' phase transformations in layered WS2 nanosheets, resulting in significantly enhanced conductivity across the overall films. Both thermoelectric devices and supercapacitors are fabricated utilizing the highly conductive 1T' phase WS2 nanosheet films as a working electrode, allowing for outstanding performance due to the increased conductivity of the WS2 nanosheet films. The method constitutes a facile approach toward the use of chemically exfoliated 1T' TMDC nanosheets for highly efficient energy device applications. Abstract : Highly conductive and stable 2D 1T´ phase WS2 films are realized by a simple chemical, and eco‐friendly l ‐ascorbic acid treatment. The l ‐ascorbic acid reduces residual LiOx compounds to Li metal, subsequently inducing 1T´ phase transformations in layered WS2 nanosheets, resulting in significantly enhanced conductivity across the overall films. This method shows potential for fabricating highly efficient energy management devices.