TY - JOUR
T1 - Paramagnetic Defects in Hydrothermally Grown Few-Layered MoS2 Nanocrystals
AU - Martinez, Luis M.
AU - Chinnathambi, Karthik
AU - Kongara, Madhu
AU - Singamaneni, Srinivasa Rao
N1 - Publisher Copyright:
© 2018 Materials Research Society.
PY - 2018/6/13
Y1 - 2018/6/13
N2 - In the recent past, two-dimensional (2D) nanocrystalline (NC) transition metal dichalcogenides such as MoS 2 received a great deal of attention due to their extraordinary physical properties. There has been a great interest to study the defects present in MoS 2 NCs, which alter the material’s catalytic, electrical, and magnetic properties. This work reports paramagnetic point defects present in the hydrothermally grown 2H–MoS 2 NCs. X-band electron spin resonance (ESR) spectroscopy has been used to identify the defects which contain unpaired electron spins in the as-prepared and Ar-annealed MoS 2 NCs. At least seven ESR signals were detected originating from four inequivalent paramagnetic defect sites such as adsorbed oxygen species, sulfur vacancies, thio-, and oxo-Mo 5+ . Upon Ar-annealing, most of these defects did not survive, instead conduction ESR signal was observed. This work signifies the importance of employing ESR spectroscopy and broadens the knowledge in identifying the atomic defects in MoS 2 NCs.
AB - In the recent past, two-dimensional (2D) nanocrystalline (NC) transition metal dichalcogenides such as MoS 2 received a great deal of attention due to their extraordinary physical properties. There has been a great interest to study the defects present in MoS 2 NCs, which alter the material’s catalytic, electrical, and magnetic properties. This work reports paramagnetic point defects present in the hydrothermally grown 2H–MoS 2 NCs. X-band electron spin resonance (ESR) spectroscopy has been used to identify the defects which contain unpaired electron spins in the as-prepared and Ar-annealed MoS 2 NCs. At least seven ESR signals were detected originating from four inequivalent paramagnetic defect sites such as adsorbed oxygen species, sulfur vacancies, thio-, and oxo-Mo 5+ . Upon Ar-annealing, most of these defects did not survive, instead conduction ESR signal was observed. This work signifies the importance of employing ESR spectroscopy and broadens the knowledge in identifying the atomic defects in MoS 2 NCs.
KW - MoS2 nanocrystals
KW - electron spin resonance
KW - paramagnetic point defects
UR - https://scholarworks.boisestate.edu/mse_facpubs/357
UR - https://doi.org/10.1557/jmr.2018.149
U2 - 10.1557/jmr.2018.149
DO - 10.1557/jmr.2018.149
M3 - Article
SN - 0884-2914
VL - 33
SP - 1565
EP - 1572
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 11
ER -