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Issue 38, 2017
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Transport in polymer-supported chemically-doped CVD graphene

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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.

Graphical abstract: Transport in polymer-supported chemically-doped CVD graphene

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The article was received on 26 May 2017, accepted on 06 Sep 2017 and first published on 07 Sep 2017

Article type: Paper
DOI: 10.1039/C7TC02263H
Citation: J. Mater. Chem. C, 2017,5, 9886-9897
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    Transport in polymer-supported chemically-doped CVD graphene

    M. H. Kang, G. Qiu, B. Chen, A. Jouvray, K. B. K. Teo, C. Cepek, L. Wu, J. Kim, W. I. Milne and M. T. Cole, J. Mater. Chem. C, 2017, 5, 9886
    DOI: 10.1039/C7TC02263H

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