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      • Simultaneous Electrochemical Reduction and Delamination of Graphene Oxide Films

        Wang, Xiaohan,Kholmanov, Iskandar,Chou, Harry,Ruoff, Rodney S. American Chemical Society 2015 ACS NANO Vol.9 No.9

        <P>Here we report an electrochemical method to simultaneously reduce and delaminate graphene oxide (G-O) thin films deposited on metal (Al and Au) substrates. During the electrochemical reaction, interface charge transfer between the G-O thin film and the electrode surface was found to be important in eliminating oxygen-containing groups, yielding highly reduced graphene oxide (rG-O). In the meantime, hydrogen bubbles were electrochemically generated at the rG-O film/electrode interface, propagating the film delamination. Unlike other metal-based G-O reduction methods, the metal used here was either not etched at all (for Au) or etched a small amount (for Al), thus making it possible to reuse the substrate and lower production costs. The delaminated rG-O film exhibits a thickness-dependent degree of reduction: greater reduction is achieved in thinner films. The thin rG-O films having an optical transmittance of 90% (λ = 550 nm) had a sheet resistance of 6390 ± 447 Ω/□ (ohms per square). rG-O-based stretchable transparent conducting films were also demonstrated.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-9/acsnano.5b03814/production/images/medium/nn-2015-03814x_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b03814'>ACS Electronic Supporting Info</A></P>

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