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An Insight into the Phase Transformation of WS 2 upon Fluorination
Author(s) -
Radhakrishnan Sruthi,
Das Deya,
Deng Liangzi,
Sudeep Parambath M.,
Colas Guillaume,
los Reyes Carlos A.,
Yazdi Sadegh,
Chu Ching Wu,
Martí Angel A.,
Tiwary Chandra Sekhar,
Filleter Tobin,
Singh Abhishek K.,
Ajayan Pulickel M.
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201803366
Subject(s) - materials science , phase (matter) , band gap , phase transition , transformation (genetics) , transition metal , chemical physics , atomic force microscopy , nanotechnology , structural stability , condensed matter physics , crystallography , optoelectronics , chemistry , physics , biochemistry , organic chemistry , structural engineering , engineering , gene , catalysis
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 WS 2 (FWS 2 ) into the 1T phase is described. The energy difference between the two phases debugs this transition, as fluorination enhances the stability of 1T FWS 2 and makes it energetically favorable at higher F concentration. Investigation of the electronic and optical nature of FWS 2 is supplemented by possible band structures and bandgap calculations. Magnetic centers in the 1T phase appear in FWS 2 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.