Transport in polymer-supported chemically-doped CVD graphene

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Moon H. Kang
  • Bingan Chen
  • Alex Jouvray
  • Kenneth B. K. Teo
  • Cinzia Cepek
  • Jongmin Kim
  • William I. Milne
  • Matthew T. Cole

Detail(s)

Original languageEnglish
Pages (from-to)9886-9897
Journal / PublicationJournal of Materials Chemistry C
Volume5
Issue number38
Early online date7 Sep 2017
Publication statusPublished - 14 Oct 2017

Link(s)

Abstract

In this study we report on the electron transport in flexible-transparent polymer supported chemically doped chemical vapour deposited (CVD) graphene. We investigate the modified carrier transport following doping with various metal chlorides. An increase in the work function was noted for AuCl3-, FeCl3-, IrCl3-, and RhCl3-doping, whilst only SnCl2 doping showed a reduced work function. We attribute this to dopant-mediated charge transfer resulting in the formation of neutral atomic species. The neutral and near-neutral atomic populations produced metallic aggregates, with this agglomeration level critically dependent on the cohesive energy of the metallic component in each dopant. Micron-scale spatial conductivity mapping highlighted the spatially uniform low resistance of AuCl3-doped graphene. Local conductivity enhancements at grain boundaries and lattice defects within the as-synthesised polycrystalline graphene suggested that the dopant molecules tend to reside at lattice imperfections. Temperature dependent transport studies indicated that the shifted work function improved electrical conductivity due to the increase of barrier transparency between grain boundaries. Variable Range Hopping (VRH) dominated at temperatures <140 K in undoped graphene, whereas combined Nearest Neighbour Hopping (NNH) and diffusive transport appears to play a major role throughout the transport in all doped samples. The findings herein reveal that the underlying extended transport mechanisms associated with chemically doped CVD graphene transferred to polymer supports contrast with the highly localised transport in undoped graphene.

Research Area(s)

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Full text of this publication does not contain sufficient affiliation information. With consent from the author(s) concerned, the Research Unit(s) information for this record is based on the existing academic department affiliation of the author(s).

Citation Format(s)

Transport in polymer-supported chemically-doped CVD graphene. / Kang, Moon H.; Qiu, Guangyu; Chen, Bingan; Jouvray, Alex; Teo, Kenneth B. K.; Cepek, Cinzia; Wu, Lawrence; Kim, Jongmin; Milne, William I.; Cole, Matthew T.

In: Journal of Materials Chemistry C, Vol. 5, No. 38, 14.10.2017, p. 9886-9897.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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