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Sulfur Segregation and Surface Site Vacancy Compensation During Methanol to Methoxy Reactions on MoS2

Published online by Cambridge University Press:  27 December 2018

Prescott E. Evans ,
Hae-Kyung Jeong  and
Peter A. Dowben
Prescott E. Evans*
Affiliation:
Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE68588-0299, U.S.A
Hae-Kyung Jeong
Affiliation:
Department of Physics, Institute of Basic Science, Daegu University, Gyeongsan712-714, Korea
Peter A. Dowben
Affiliation:
Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE68588-0299, U.S.A
*
*(Email: prescott.evans@huskers.unl.edu)
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Abstract

Sulfur loss from the surface of MoS2(0001) is observed following the adsorption of methanol on MoS2 at 86 K and subsequent annealing of MoS2 near 300 K. This sulfur loss, at the MoS2 surface, leads to suppression of inverse photoemission features characteristic of the unoccupied states associated with MoS2. This sulfur loss is counteracted by further annealing to 350 K, as is evident in the temperature dependent sulfur to molybdenum integrated X-ray photoemission intensity ratios near 300 to 350 K. Upon further annealing to 350 K, inverse photoemission additionally indicates a reestablishment of characteristic features associated with the unoccupied states of MoS2. These results are indicative of sulfur segregation to the surface and compensation of surface vacancy sites.

Keywords

catalytic2D materialselectronic structurex-ray photoelectron spectroscopy (XPS)defects
Type
Articles
Information
MRS Advances , Volume 4 , Issue 15: Energy-Transfer, Storage and Conversion , 2019 , pp. 873 - 878
Copyright
Copyright © Materials Research Society 2018 

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