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Title: Temperature dependent Raman spectroscopy of chemically derived few layer MoS{sub 2} and WS{sub 2} nanosheets

We have systematically investigated the temperature dependent Raman spectroscopy behavior of a few layered MoS{sub 2} and WS{sub 2} nanosheets synthesized using simple hydrothermal method. Our result reveals A{sub 1g} and E{sup 1}{sub 2g} 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 MoS{sub 2} and WS{sub 2}. This mechanism can also be applicable in characterizing the structural, optical, electronic, and vibrational properties of other emerging layered materials.
Authors:
; ;  [1] ;  [2]
  1. Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune 411008 (India)
  2. School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar 751013 (India)
Publication Date:
OSTI Identifier:
22293029
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; HYDROTHERMAL SYNTHESIS; MOLYBDENUM SULFIDES; NANOSTRUCTURES; RAMAN SPECTROSCOPY; RESONANCE; SHEETS; TEMPERATURE DEPENDENCE; TUNGSTEN SULFIDES