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Controlled preferential oxidation of grain boundaries in monolayer tungsten disulfide for direct optical imaging
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Rong, Youmin, He, Kuang, Pacios, Mercè, Robertson, Alex W., Bhaskaran, Harish and Warner, Jamie H. (2015) Controlled preferential oxidation of grain boundaries in monolayer tungsten disulfide for direct optical imaging. ACS Nano, 9 (4). pp. 3695-3703. doi:10.1021/acsnano.5b00852 ISSN 1936-0851.
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Official URL: http://dx.doi.org/10.1021/acsnano.5b00852
Abstract
Synthetic 2D crystal films grown by chemical vapor deposition are typically polycrystalline, and determining grain size within domains and continuous films is crucial for determining their structure. Here we show that grain boundaries in the 2D transition metal dichalcogenide WS2, grown by CVD, can be preferentially oxidized by controlled heating in air. Under our developed conditions, preferential degradation at the grain boundaries causes an increase in their physical size due to oxidation. This increase in size enables their clear and rapid identification using a standard optical microscope. We demonstrate that similar treatments in an Ar environment do no show this effect, confirming that oxidation is the main role in the structural change. Statistical analysis of grain boundary (GB) angles shows dominant mirror formation. Electrical biasing across the GB is shown to lead to changes at the GB and their observation under an optical microscope. Our approach enables high-throughput screening of as-synthesized WS2 domains and continuous films to determine their crystallinity and should enable improvements in future CVD growth of these materials.
Item Type: | Journal Article | ||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Journal or Publication Title: | ACS Nano | ||||||||||
Publisher: | American Chemical Society | ||||||||||
ISSN: | 1936-0851 | ||||||||||
Official Date: | 28 April 2015 | ||||||||||
Dates: |
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Volume: | 9 | ||||||||||
Number: | 4 | ||||||||||
Page Range: | pp. 3695-3703 | ||||||||||
DOI: | 10.1021/acsnano.5b00852 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Copyright Holders: | American Chemical Society | ||||||||||
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