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 t

SUBMITTER: Wang H 

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

REPOSITORIES: biostudies-literature