Determination of temperature-dependent Fermi resonance in acetonitrile–water binary solution by two-dimensional correlation Raman spectroscopy

2021 ◽  
Vol 155 (12) ◽  
pp. 124302
Author(s):  
Xianwen Cao ◽  
Lu Xing ◽  
Ying Wang ◽  
Shenghan Wang ◽  
Chenglin Sun ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Binary Solution ◽  
Fermi Resonance ◽  
Two Dimensional ◽  
Temperature Dependent

scholarly journals Study of Thermometry in Two-Dimensional Sb2Te3 from Temperature-Dependent Raman Spectroscopy

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Manavendra P. Singh ◽  
Manab Mandal ◽  
K. Sethupathi ◽  
M. S. Ramachandra Rao ◽  
Pramoda K. Nayak
Keyword(s):  
Thermal Conductivity ◽  
Raman Spectroscopy ◽  
Temperature Coefficient ◽  
Heat Dissipation ◽  
Peak Position ◽  
Two Dimensional ◽  
Phonon Modes ◽  
Temperature Dependent ◽  
Excellent Candidate ◽  
High Figure

AbstractDiscovery of two-dimensional (2D) topological insulators (TIs) demonstrates tremendous potential in the field of thermoelectric since the last decade. Here, we have synthesized 2D TI, Sb2Te3 of various thicknesses in the range 65–400 nm using mechanical exfoliation and studied temperature coefficient in the range 100–300 K using micro-Raman spectroscopy. The temperature dependence of the peak position and line width of phonon modes have been analyzed to determine the temperature coefficient, which is found to be in the order of 10–2 cm−1/K, and it decreases with a decrease in Sb2Te3 thickness. Such low-temperature coefficient would favor to achieve a high figure of merit (ZT) and pave the way to use this material as an excellent candidate for thermoelectric materials. We have estimated the thermal conductivity of Sb2Te3 flake with the thickness of 115 nm supported on 300-nm SiO2/Si substrate which is found to be ~ 10 W/m–K. The slightly higher thermal conductivity value suggests that the supporting substrate significantly affects the heat dissipation of the Sb2Te3 flake.

Determination of two-dimensional phonon dispersion relation of graphite by Raman spectroscopy

2002 ◽  
Vol 65 (15) ◽  
Author(s):  
A. Grüneis ◽  
R. Saito ◽  
T. Kimura ◽  
L. G. Cançado ◽  
M. A. Pimenta ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Dispersion Relation ◽  
Phonon Dispersion ◽  
Two Dimensional ◽  
Phonon Dispersion Relation

scholarly journals Basic Concepts and Recent Advances of Crystallographic Orientation Determination of Graphene by Raman Spectroscopy

Crystals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 375 ◽  
Author(s):  
Yucheng Lan ◽  
Mobolaji Zondode ◽  
Hua Deng ◽  
Jia-An Yan ◽  
Marieme Ndaw ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Crystallographic Orientation ◽  
Graphene Nanosheets ◽  
Two Dimensional ◽  
Two Dimensional Materials ◽  
Unique Material ◽  
Determination Methods ◽  
Orientation Determination ◽  
Crystallographic Orientations

Graphene is a kind of typical two-dimensional material consisting of pure carbon element. The unique material shows many interesting properties which are dependent on crystallographic orientations. Therefore, it is critical to determine their crystallographic orientations when their orientation-dependent properties are investigated. Raman spectroscopy has been developed recently to determine crystallographic orientations of two-dimensional materials and has become one of the most powerful tools to characterize graphene nondestructively. This paper summarizes basic aspects of Raman spectroscopy in crystallographic orientation of graphene nanosheets, determination principles, the determination methods, and the latest achievements in the related studies.

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