Structural, optical and electrostatic properties of single and fewlayers MoS2:effect of substrate

Robinson, Benjamin and Giusca, Cristina and Gonzalez, Yurema and Kay, Nicholas and Kazakova, Olga and Kolosov, Oleg (2015) Structural, optical and electrostatic properties of single and fewlayers MoS2:effect of substrate. 2D Materials, 2 (1). ISSN 2053-1583

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Abstract

We have decoupled the intrinsic electrostatic effects arising in monolayer and few-layer MoS2 from those influenced by the flake-substrate interaction. Using ultrasonic force microscopy nanomechanical mapping, we identify the change from supported to suspended flake regions on a trenched substrate. These regions are correlated with the surface potential as measured by scanning Kelvin probe microscopy. Relative to the supported region, we observe an increase in surface potential contrast due to suppressed charge transfer for the suspended monolayer. Using Raman spectroscopy we observe a red shift of the E12g mode for monolayer MoS2 deposited on Si, consistent with a more strained MoS2 on the Si substrate compared to the Au substrate.

Item Type:
Journal Article
Journal or Publication Title:
2D Materials
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Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2210
Subjects:
ID Code:
73079
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Deposited On:
27 Feb 2015 10:26
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Nov 2020 02:52