Triboelectrification of Two-Dimensional Chemical Vapor Deposited WS2 at Nanoscale

Triboelectric properties of chemical vapor deposited WS 2 nanoflakes have been characterized in nano-range by atomic force microscopy (AFM) and Kelvin force microscopy (KFM). The triboelectric process is dependent on the thickness of WS 2 nanoflakes, and it is sensitive to the adsorbates like water...

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Bibliographic Details
Published in:Scientific reports 2019-08, Vol.9 (1), p.1-8, Article 12570
Main Authors: Wang, He, Huang, Chung-Che, Polcar, Tomas
Format: Article
Language:English
Subjects:
140/133
140/146
639/925/357/1018
639/925/357/995
639/925/927/1007
Atomic force microscopy
Humanities and Social Sciences
Microscopy
multidisciplinary
Science
Science (multidisciplinary)
Vapors
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Summary:Triboelectric properties of chemical vapor deposited WS 2 nanoflakes have been characterized in nano-range by atomic force microscopy (AFM) and Kelvin force microscopy (KFM). The triboelectric process is dependent on the thickness of WS 2 nanoflakes, and it is sensitive to the adsorbates like water molecules, as well as transferred Pt from the tip on the sample. The density of tribo-charge can be modified by applying various biases to the conductive Pt-coated tip during the frictional process. Tunneling of the tribo-charge into the gap between WS 2 and the underlying substrate results in a long lifetime, which is about 100 times longer than conventional triboelectric charges. Moreover, we observe a positive correlation between the layer number and resistance to charge dissipation. Our finding can become the driving force for a new category of two-dimensional (2D) WS 2 triboelectrically controllable nanodevices.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-49107-y