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Paramagnetic defects in hydrothermally grown few-layered MoS2 nanocrystals

Published online by Cambridge University Press:  12 June 2018

Luis M. Martinez ,
Chinnathambi Karthik ,
Madhu Kongara  and
Srinivasa Rao Singamaneni
Luis M. Martinez
Affiliation:
Department of Physics, The University of Texas at El Paso, El Paso, Texas 79968, USA
Chinnathambi Karthik
Affiliation:
Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA
Madhu Kongara
Affiliation:
Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, USA; and Department of Physics, Boise State University, Boise, Idaho 83725, USA
Srinivasa Rao Singamaneni*
Affiliation:
Department of Physics, The University of Texas at El Paso, El Paso, Texas 79968, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In the recent past, two-dimensional (2D) nanocrystalline (NC) transition metal dichalcogenides such as MoS2 received a great deal of attention due to their extraordinary physical properties. There has been a great interest to study the defects present in MoS2 NCs, which alter the material’s catalytic, electrical, and magnetic properties. This work reports paramagnetic point defects present in the hydrothermally grown 2H–MoS2 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 MoS2 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-Mo5+. 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 MoS2 NCs.

Keywords

MoS2 nanocrystalselectron spin resonanceparamagnetic point defects
Type
Invited Paper
Information
Journal of Materials Research , Volume 33 , Issue 11 , 13 June 2018 , pp. 1565 - 1572
Copyright
Copyright © Materials Research Society 2018 

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References

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