An Insight into the Phase Transformation of WS2 upon Fluorination
Abstract
The transformation from semiconducting to metallic phase, accompanied by a structural transition in 2D transition metal dichalcogenides has attracted the attention of the researchers worldwide. The unconventional structural transformation of fluorinated WS2 (FWS2) into the 1T phase is described. The energy difference between the two phases debugs this transition, as fluorination enhances the stability of 1T FWS2 and makes it energetically favorable at higher F concentration. Investigation of the electronic and optical nature of FWS2 is supplemented by possible band structures and bandgap calculations. Magnetic centers in the 1T phase appear in FWS2 possibly due to the introduction of defect sites. A direct consequence of the phase transition and associated increase in interlayer spacing is a change in friction behavior. Friction force microscopy is used to determine this effect of functionalization accompanied phase transformation.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 21, 2018
- Source ID
- 10.1002/adma.201803366
Entities
People
- Abhishek K Singh
- Angel A MartÃ
- Carlos A. de los Reyes
- Chandra Sekhar Tiwary
- Ching Wu Chu
- Deya Das
- Guillaume Colas
- Liangzi Deng
- Parambath M. Sudeep
- Pulickel Ajayan
- Sadegh Yazdi
- Sruthi Radhakrishnan
- Tobin Filleter
Organizations
- Air Force Office of Scientific Research
- Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada
- Department of Science and Technology
- Indian Institute of Science, Bengaluru
- Indian Institutes of Technology
- Lawrence Berkeley National Laboratory
- National Science Foundation
- Rice University
- University of Colorado
- University of Houston
- University of Toronto