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Title: Superior field emission properties of layered WS2-RGO nanocomposites
Authors: Rout C.S.
Joshi P.D.
Kashid R.V.
Joag D.S.
More M.A.
Simbeck A.J.
Washington M.
Nayak S.K.
Late D.J.
Issue Date: 2013
Citation: 126
Abstract: We report here the field emission studies of a layered WS2-RGO composite at the base pressure of ?1 � 10 -8 �...mbar. The turn on field required to draw a field emission current density of 1�...?A/cm 2 is found to be 3.5, 2.3 and 2�...V/?m for WS 2, RGO and the WS2-RGO composite respectively. The enhanced field emission behavior observed for the WS2-RGO nanocomposite is attributed to a high field enhancement factor of 2978, which is associated with the surface protrusions of the single-to-few layer thick sheets of the nanocomposite. The highest current density of ?800�...?A/cm 2 is drawn at an applied field of 4.1�...V/?m from a few layers of the WS2-RGO nanocomposite. Furthermore, first-principles density functional calculations suggest that the enhanced field emission may also be due to an overalp of the electronic structures of WS2 and RGO, where graphene-like states are dumped in the region of the WS 2 fundamental gap.
Appears in Collections:Research Publications

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