Triboelectrification of two-dimensional chemical vapor deposited WS2 at nanoscale

Wang, He, Huang, Chung-Che and Polcar, Tomas (2019) Triboelectrification of two-dimensional chemical vapor deposited WS₂ at nanoscale. Scientific Reports, 9, 1-8, [12570]. (doi:10.1038/s41598-019-49107-y).

Record type: Article

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.

Text

Manuscript - Accepted Manuscript

Available under License University of Southampton Accepted Manuscript Licence.

Download (728kB)

Text

Supporting Information - Accepted Manuscript

Available under License University of Southampton Accepted Manuscript Licence.

Download (263kB)

Text

s41598-019-49107-y - Version of Record

Available under License Creative Commons Attribution.

Download (1MB)