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Liquid thin film dewetting-driven micropatterning of reduced graphene oxide electrodes for high performance OFETs

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Abstract

We present a novel approach to produce high-resolution reduced graphene oxide (rGO) micropatterns based on a dewetting phenomenon of liquid thin films. The uniform liquid thin film of aqueous graphene oxide (GO) dispersion was formed by the meniscus dragging deposition method on a pre-patterned silanized substrate. Subsequently, selective dewetting of the water layer was induced due to the surface energy gradient on the coating substrates. After drying and chemical reduction, the high-resolution rGO micropatterns with a minimum feature size of 10 μm were realized over a large area substrate by consuming less than 1 μL of GO solution per square centimeter. As a demonstration of the application of this patterning technique, we have successfully fabricated organic field-effect transistors (OFETs) based on rGO pattern arrays as source–drain electrodes. The OFETs with the rGO electrodes exhibited a field effect mobility of 0.6 cm2 (V s)−1 with an on/off ratio of 1.79 × 106, which is higher than that of the devices with Au source–drain contacts.

Graphical abstract: Liquid thin film dewetting-driven micropatterning of reduced graphene oxide electrodes for high performance OFETs

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Publication details

The article was received on 10 Aug 2018, accepted on 25 Nov 2018 and first published on 27 Nov 2018


Article type: Paper
DOI: 10.1039/C8TC03981J
Citation: J. Mater. Chem. C, 2019, Advance Article
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    Liquid thin film dewetting-driven micropatterning of reduced graphene oxide electrodes for high performance OFETs

    S. M. Lee, S. K. Song, S. Yoon, D. S. Chung and S. T. Chang, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C8TC03981J

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