One Dimensional Metallic Edges in Atomically Thin WSe2 Induced by Air Exposure

  • Authors:
    Rafik Addou (UT/Dallas), Christopher M. Smyth (UT/Dallas), Ji-Youg Noh (UT/Dallas), Yu-Chuan Lin (Penn State), Sarah M. Eichfeld (Penn State), Joshua A. Robinson (Penn State), Robert M. Wallace (UT/Dallas), Randall M. Feenstra (Carnegie Mellon Univ.), Yi Pan (Paul-Drude-Institut für Festkörperelektronik), Stefan Folsch (Paul Drude Institut für Festkörperelektronik), Kyeongjae Cho (Carnegie Mellon Univ.)
    Publication ID:
    P091048
    Publication Type:
    Paper
    Received Date:
    1-Jun-2017
    Last Edit Date:
    22-Feb-2018
    Research:
    2383.001 (University of Texas/Dallas)
    2400.009 (University of Texas/Austin)

Abstract

Using scanning probe microscopy and X-ray photoelectron spectroscopy, we report the observation of metallic edges in atomically thin WSe2 monolayers grown by chemical vapor deposition on epitaxial graphene. Scanning tunneling microscopy shows structural details of WSe2 edges and scanning tunneling spectroscopy reveals the metallic nature of the oxidized edges. Photoemission demonstrates that the formation of metallic sub-stoichiometric tungsten oxide (WO2.7) is responsible for the high conductivity measured along the edges. Ab initio calculations validate the susceptibility of WSe2 nanoribbon edges to oxidation. The zigzag terminated edge exhibits metallic behavior prior the air-exposure and remains metallic after oxidation.

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