Temperature dependent Raman spectroscopy of chemically derived few layer MoS2 and WS2 nanosheets
M ThripuranthakaPhysical and Materials Chemistry Division, CSIR-National Chemical Laboratory 1 , Dr. Homi Bhabha Road, Pashan, Pune 411008, IndiaRanjit V. KashidPhysical and Materials Chemistry Division, CSIR-National Chemical Laboratory 1 , Dr. Homi Bhabha Road, Pashan, Pune 411008, IndiaChandra Sekhar RoutSchool of Basic Sciences, Indian Institute of Technology Bhubaneswar 2 , Bhubaneswar 751013, IndiaDattatray J. LatePhysical and Materials Chemistry Division, CSIR-National Chemical Laboratory 1 , Dr. Homi Bhabha Road, Pashan, Pune 411008, India
2014en
ABI
Annotatsiya
We have systematically investigated the temperature dependent Raman spectroscopy behavior of a few layered MoS2 and WS2 nanosheets synthesized using simple hydrothermal method. Our result reveals A1g and E12g modes soften as temperature increases from 77 K to 623 K. This behavior can be explained in terms of a double resonance process which is active in single- and few layer thick nanosheets. The frequency shifts and peak broadening can provide unambiguous, nondestructive, and accurate information of a few layered MoS2 and WS2. This mechanism can also be applicable in characterizing the structural, optical, electronic, and vibrational properties of other emerging layered materials.
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