title: Simultaneous Electrochemical Reduction and Delamination of Graphene Oxide Films.
abstract: 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.
authors.affiliation: Materials Science and Engineering Program, University of Texas at Austin , Austin, Texas 78712, United States.
authors.forename: Xiaohan
authors.initials: X
authors.lastname: Wang
authors.affiliation: Materials Science and Engineering Program, University of Texas at Austin , Austin, Texas 78712, United States.|CNR-INO Brescia, Sensor Lab, Via Branze 45, 25123 Brescia, Italy.
authors.forename: Iskandar
authors.initials: I
authors.lastname: Kholmanov
authors.affiliation: Materials Science and Engineering Program, University of Texas at Austin , Austin, Texas 78712, United States.
authors.forename: Harry
authors.initials: H
authors.lastname: Chou
authors.affiliation: Materials Science and Engineering Program, University of Texas at Austin , Austin, Texas 78712, United States.|Center for Multidimensional Carbon Materials, Institute of Basic Sciences Center, Ulsan National Institute of Science and Technology , Ulsan, 689-798, Republic of Korea.
authors.forename: Rodney S
authors.initials: RS
authors.lastname: Ruoff
keywords: electrochemical reduction; graphene oxide; stretchable electronics; transparent conducting films