Atomic scale study for the structural transformation of single layered MoS2

• Published in: CrystEngComm Vol. 2; no. 41; pp. 6482 - 6489
• Main Authors: Dahanayake, Damayanthi, Gunasekara, Sunanda, Jayaweera, Vimukthi, Sandaruwan, Chanaka, Karunarathne, Veranja, Amaratunga, Gehan A. J
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 2018
• Subjects: Chemical composition; Electron energy loss spectroscopy; Energy dissipation; Honeycomb construction; Honeycomb structures; Molybdenum disulfide; Organic chemistry; Phase transitions; Raman spectroscopy; Spectrum analysis
• ISSN: 1466-8033
• DOI: 10.1039/c8ce01136b

The structural transformation of single and few layered molybdenum disulfide (MoS 2 ) from 2H to 1T phase was studied at the atomic scale. Single layered MoS 2 was prepared via ultrasonication of an ethanolic dispersion. Bulk MoS 2 was in the 2H phase, which was confirmed via XRD. The reduction of the difference between the characteristic peaks of MoS 2 was observed through Raman spectroscopy for the exfoliated MoS 2 . Without adding any other atoms, a phase transformation of MoS 2 was observed. The transformation of the 2H phase MoS 2 to the 1T phase was studied under a high resolution transmission electron microscope (HRTEM). The characteristic honeycomb structure together with the specific pattern of the back-folded edge of MoS 2 confirm the structural transformation. Electron energy loss spectroscopy (EELS) was performed to ascertain the chemical composition of MoS 2 . The structural transformation of single and few layered molybdenum disulfide (MoS 2 ) from 2H to 1T phase was studied at the atomic scale.