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Inorganics 2017, 5(1), 1; doi:10.3390/inorganics5010001

Modification of Deposited, Size-Selected MoS2 Nanoclusters by Sulphur Addition: An Aberration-Corrected STEM Study

Nanoscale Physics, Chemistry and Engineering Research Laboratory, School of Physics & Astronomy, University of Birmingham, Birmingham B15 2TT, UK
Author to whom correspondence should be addressed.
Academic Editors: Stefan T. Bromley and Scott M. Woodley
Received: 28 October 2016 / Revised: 14 December 2016 / Accepted: 20 December 2016 / Published: 22 December 2016
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Molybdenum disulphide (MoS2) is an earth-abundant material which has several industrial applications and is considered a candidate for platinum replacement in electrochemistry. Size-selected MoS2 nanoclusters were synthesised in the gas phase using a magnetron sputtering, gas condensation cluster beam source with a lateral time-of-flight mass selector. Most of the deposited MoS2 nanoclusters, analysed by an aberration-corrected scanning transmission electron microscope (STEM) in high-angle annular dark field (HAADF) mode, showed poorly ordered layer structures with an average diameter of 5.5 nm. By annealing and the addition of sulphur to the clusters (by sublimation) in the cluster source, the clusters were transformed into larger, crystalline structures. Annealing alone did not lead to crystallization, only to a cluster size increase by decomposition and coalescence of the primary clusters. Sulphur addition alone led to a partially crystalline structure without a significant change in the size. Thus, both annealing and sulphur addition processes were needed to obtain highly crystalline MoS2 nanoclusters. View Full-Text
Keywords: molybdenum disulphide; MoS2; STEM; cluster; crystalline; sulphur addition molybdenum disulphide; MoS2; STEM; cluster; crystalline; sulphur addition

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Niu, Y.; Park, S.J.; Palmer, R.E. Modification of Deposited, Size-Selected MoS2 Nanoclusters by Sulphur Addition: An Aberration-Corrected STEM Study. Inorganics 2017, 5, 1.

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