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Changes in the Raman spectra of monolayer MoS 2 upon thermal annealing
Author(s) -
Kim HoJong,
Kim Daehee,
Jung Suyong,
Bae MyungHo,
Yun Yong Ju,
Yi Sam Nyung,
Yu JeongSeon,
Kim JongHyun,
Ha Dong Han
Publication year - 2018
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5476
Subject(s) - raman spectroscopy , annealing (glass) , monolayer , materials science , spectral line , doping , analytical chemistry (journal) , molecule , chemistry , nanotechnology , optoelectronics , optics , composite material , physics , organic chemistry , astronomy , chromatography
Defects have crucial effects on the electronic and optoelectronic properties of two‐dimensional materials. In this work, we measured the changes in the Raman spectra and electrical conductance of monolayer molybdenum disulfide (MoS 2 ) with increasing defects via thermal annealing in a reducing atmosphere. Raman spectra of the basal plane MoS 2 on SiO 2 differed from those of the edge and revealed intricate changes upon annealing up to 550°C due to the substitution of adsorbed molecules and the creation of highly concentrated defects. On the other hand, MoS 2 on hexagonal boron nitride (h‐BN) presented homogenous Raman spectra over the entire area and showed no noticeable changes in its Raman spectra upon annealing. For MoS 2 on h‐BN, the charge transfer between MoS 2 and adsorbed molecules and the number of defects created by annealing up to 550°C are not sufficient to change the Raman spectra. The distinct behaviors of the two sample spectra are ascribed to different substrate‐induced doping and interfacial adhesion strengths.