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Triboelectrification of Two-Dimensional Chemical Vapor Deposited WS₂ at Nanoscale.

ABSTRACT: Triboelectric properties of chemical vapor deposited WS₂ 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 WS₂ 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 WS₂ 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) WS₂ triboelectrically controllable nanodevices.

SUBMITTER: Wang H

PROVIDER: S-EPMC6715710 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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Triboelectrification of Two-Dimensional Chemical Vapor Deposited WS2 at Nanoscale.

Wang He H Huang Chung-Che CC Polcar Tomas T

Scientific reports 20190829 1

Triboelectric properties of chemical vapor deposited WS2 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 WS2 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 f ...[more]

PMID: 31467397

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