Reduced Water Vapor Transmission Rate of Graphene Gas Barrier Films for Flexible Organic Field-Effect Transistors

Title
Reduced Water Vapor Transmission Rate of Graphene Gas Barrier Films for Flexible Organic Field-Effect Transistors
Authors
장재영
Keywords
bending cycles; graphene barrier; OFETs; water vapor transmittance rate
Issue Date
2015-06
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v. 9, NO 6, Page. 5818-5824
Abstract
Preventing reactive gas species such as oxygen or water is important to ensure the stability and durability of organic electronics. Although inorganic materials have been predominantly employed as the protective layers, their poor mechanical property has hindered the practical application to flexible electronics. The densely packed hexagonal lattice of carbon atoms in graphene does not allow the transmission of small gas molecules. In addition, its outstanding mechanical flexibility and optical transmittance are expected to be useful to overcome the current mechanical limit of the inorganic materials. In this paper, we reported the measurement of the water vapor transmission rate (WVTR) through the 6-layer 10 x 10 cm(2) large-area graphene films synthesized by chemical vapor deposition (ND). The WVTR was measured to be as low as 10(-4) g/m(2). day initially, and stabilized at similar to 0.48 g/m(2). day, which corresponds to 7 times reduction in WVTR compared to bare polymer substrates. We also showed that the graphene-passivated organic field-effect transistors (OFETs) exhibited excellent environmental stability as well as a prolonged lifetime even after 500 bending cycles with strain of 2.3%. We expect that our results would be a good reference showing the graphene's potential as gas barriers for organic electronics.
URI
http://pubs.acs.org/doi/abs/10.1021/acsnano.5b01161http://hdl.handle.net/20.500.11754/25457
ISSN
1936-0851; 1936-086X
DOI
http://dx.doi.org/10.1021/acsnano.5b01161
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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