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Title: Temperature- and phase-dependent phonon renormalization in 1T '-MoS2
Authors: Tan, SJR
Sarkar, S
Zhao, XX
Luo, X 
Luo, YZ
Poh, SM
Abdelwahab, I
Zhou, W
Venkatesan, T
Chen, W
Quek, SY
Loh, KP
Keywords: MoS2
Raman spectroscopy
Phase engineering
Temperature coefficient
Issue Date: 2018
Publisher: American Chemical Society
Source: ACS nano, May 2018, v. 12, no. 5, p. 5051-5058 How to cite?
Journal: ACS nano 
Abstract: Polymorph engineering of 2H-MoS2, which can be achieved by alkali metal intercalation to obtain either the mixed 2H/1T ' phases or a homogeneous IT ' phase, has received wide interest recently, since this serves as an effective route to tune the electrical and catalytic properties of MoS2. As opposed to an idealized single crystal-to-single crystal phase conversion, the 2H to IT ' phase conversion results in crystal domain size reduction as well as strained lattices, although how these develop with composition is not well understood. Herein, the evolution of the phonon modes in Li-intercalated 1T '-MoS2 (LixMoS2) are investigated as a function of different 1T '-2H compositions. We observed that the strain evolution in the mixed phases is revealed by the softening of four Raman modes, B-g (J(1)), A(g) (J(3)), E-2g(1), and A(1g), with increasing IT ' phase composition. Additionally, the first-order temperature coefficients of the 1T ' phonon mode vary linearly with increasing IT ' composition, which is explained by increased electron phonon and strain phonon coupling.
ISSN: 1936-0851
EISSN: 1936-086X
DOI: 10.1021/acsnano.8b02649
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