Transparent conductive films consisting of ultralarge graphene sheets produced by Langmuir-Blodgett assembly

Qingbin Zheng, Wai Hing Ip, Xiuyi Lin, Nariman Yousefi, Kan Kan Yeung, Zhigang Li, Jang Kyo Kim

Research output: Contribution to journalArticlepeer-review

399 Scopus citations

Abstract

Monolayer graphene oxide (GO) sheets with sizes ranging from a few to ∼200 μm are synthesized based on a chemical method and are sorted out to obtain four different grades having uniform sizes. Transparent conductive films are produced using the ultralarge graphene oxide (UL-GO) sheets that are deposited layer-by-layer on a substrate using the Langmuir-Blodgett (LB) assembly technique. The density and degree of wrinkling of the UL-GO monolayers are turned from dilute, close-packed flat UL-GO to graphene oxide wrinkles (GOWs) and concentrated graphene oxide wrinkles (CGOWs) by varying the LB processing conditions. The method demonstrated here opens up a new avenue for high-yield fabrication of GOWs or CGOWs that are considered promising materials for hydrogen storage, supercapacitors, and nanomechanical devices. The films produced from UL-GO sheets with a close-packed flat structure exhibit exceptionally high electrical conductivity and transparency after thermal reduction and chemical doping treatments. A remarkable sheet resistance of ∼500 Ω/sq at 90% transparency is obtained, which outperforms the graphene films grown on a Ni substrate by chemical vapor deposition. The technique used in this work to produce transparent conductive UL-GO thin films is facile, inexpensive, and tunable for mass production.

Original languageBritish English
Pages (from-to)6039-6051
Number of pages13
JournalACS Nano
Volume5
Issue number7
DOIs
StatePublished - 26 Jul 2011

Keywords

  • graphene oxide wrinkles
  • Langmuir-Blodgett assembly
  • self-assembly
  • transparent conductive films
  • ultralarge graphene oxide

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