title: Enhanced transparent conducting networks on plastic substrates modified with highly oxidized graphene oxide nanosheets.
abstract: Atomically thin and two-dimensional graphene oxide (GO) is a very fascinating material because of its functional groups, high transparency, and solution processability. Here we show that highly oxidized GO (HOGO) nanosheets serve as an effective interfacial modifier of transparent conducting films with one-dimensional (1D) silver nanowires (AgNWs) and single-walled carbon nanotubes (SWCNTs). Optically transparent and small-sized GO nanosheets, with minimal sp(2) domains, were successfully fabricated by step-wise oxidation and exfoliation of graphite. We demonstrated that under-coated HOGO further decreases the sheet resistance of the SWCNT film top-coated with HOGO by increasing the contact area between the SWCNTs and HOGO nanosheets by generating hole carriers in the SWCNT as a result of charge transfer. Moreover, HOGO nanosheets with AgNWs contribute to the efficient thermal joining of AgNW networks on plastic substrates by limiting the thermal embedding of AgNWs into the plastic surface, resulting in efficient decrease of the sheet resistance. Furthermore, flexible organic photovoltaic cells with GO-modified AgNW anodes on a flexible substrate were successfully demonstrated.
authors.affiliation: Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute, Changwon, 641-120, Republic of Korea. jthan@keri.re.kr and Department of Polymer Science & Engineering, Polymeric Nanomaterials Laboratory, School of Applied Chemical Engineering, Kyungpook National University, #1370 Sangyuk-dong, Buk-gu, Daegu 702-701, Republic of Korea. psy@knu.ac.kr.
authors.forename: Jong Seok
authors.initials: JS
authors.lastname: Woo
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology, San 31, Hyojadong, Pohang, 790-784, Republic of Korea. kwcho@postech.ac.kr.
authors.forename: Dong Hun
authors.initials: DH
authors.lastname: Sin
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology, San 31, Hyojadong, Pohang, 790-784, Republic of Korea. kwcho@postech.ac.kr.
authors.forename: Haena
authors.initials: H
authors.lastname: Kim
authors.affiliation: Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute, Changwon, 641-120, Republic of Korea. jthan@keri.re.kr.
authors.forename: Jeong In
authors.initials: JI
authors.lastname: Jang
authors.affiliation: Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute, Changwon, 641-120, Republic of Korea. jthan@keri.re.kr.
authors.forename: Ho Young
authors.initials: HY
authors.lastname: Kim
authors.affiliation: Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute, Changwon, 641-120, Republic of Korea. jthan@keri.re.kr.
authors.forename: Geon-Woong
authors.initials: GW
authors.lastname: Lee
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology, San 31, Hyojadong, Pohang, 790-784, Republic of Korea. kwcho@postech.ac.kr.
authors.forename: Kilwon
authors.initials: K
authors.lastname: Cho
authors.affiliation: Department of Polymer Science & Engineering, Polymeric Nanomaterials Laboratory, School of Applied Chemical Engineering, Kyungpook National University, #1370 Sangyuk-dong, Buk-gu, Daegu 702-701, Republic of Korea. psy@knu.ac.kr.
authors.forename: Soo-Young
authors.initials: SY
authors.lastname: Park
authors.affiliation: Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute, Changwon, 641-120, Republic of Korea. jthan@keri.re.kr.
authors.forename: Joong Tark
authors.initials: JT
authors.lastname: Han