Whiskey-phase exfoliation: exfoliation and printing of nanosheets using Irish whiskey
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Journal ArticleDate:
2019Access:
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Adam G Kelly, VictorVega-Mayoral, John B Boland and Jonathan N Coleman, Whiskey-phase exfoliation: exfoliation and printing of nanosheets using Irish whiskey, 2D Materials, 6, 045036, 2019, 1 - 8Abstract:
Recent advances in the liquid-phase exfoliation (LPE) of layered materials have facilitated significant
progress in the creation of functional inks. While ethanol/water blends have been shown to
yield reasonable nanosheet dispersions with the potential for refinement into printable inks, the
exfoliated mass is typically too low for practical use. Here, we show that Irish whiskey can be used as
a dispersant for nanosheets of graphene, BN and WS2, yielding stable dispersions at reasonably high
concentrations. We see some benefits compared to exfoliation in simple ethanol/water mixtures
which we attribute to the presence of organic compounds in the whiskey. Size selection yields
nanosheets which are relatively thin, with photoluminescence spectroscopy confirming the presence
of monolayer tungsten disulfide (WS2). We also show that whiskey-dispersed nanosheets of graphene
and WS2 can be printed into networks. These can be combined in heterostructures to produce thinfilm transistors whose current can be modulated using ionic liquid (IL) gating. These devices show
on:off ratios up to 340 and mobilities up to 1.5 × 10−3
cm2
V−1
s−1
. The fact that these networks can
be gated at all demonstrates the robustness of nanosheet networks against external additives while
the mobility reported here should represent a performance-floor for future devices.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
SFI/12/RC/2278
European Commission
604391
European Commission
785219
Author's Homepage:
http://people.tcd.ie/colemajhttp://people.tcd.ie/jboland
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PUBLISHED
Author: Coleman, Jonathan; Boland, John
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Journal ArticleCollections
Series/Report no:
2D Materials6
045036
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Full text availableKeywords:
two dimensional materialsSubject (TCD):
Nanoscience & MaterialsDOI:
http://dx.doi.org/10.1088/2053-1583/ab3892Metadata
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