Conductivity mapping of graphene on polymeric films by terahertz time-domain spectroscopy | Zendy

Patrick R. Whelan | Zendy; Deping Huang | Zendy; David M. A. Mackenzie | Zendy; Sara A. Messina | Zendy; Zhancheng Li | Zendy; Xin Li | Zendy; Yunqing Li | Zendy; Timothy J. Booth | Zendy; Peter Uhd Jepsen | Zendy; Haofei Shi | Zendy; Peter Bøggild | Zendy

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Conductivity mapping of graphene on polymeric films by terahertz time-domain spectroscopy

Author(s) -

Patrick R. Whelan,

Deping Huang,

David M. A. Mackenzie,

Sara A. Messina,

Zhancheng Li,

Xin Li,

Yunqing Li,

Timothy J. Booth,

Peter Uhd Jepsen,

Haofei Shi,

Peter Bøggild

Publication year - 2018

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.017748

Subject(s) - graphene , terahertz radiation , materials science , terahertz spectroscopy and technology , optics , conductivity , spectroscopy , refractive index , optoelectronics , nanotechnology , physics , quantum mechanics

Fast inline characterization of the electrical properties of graphene on polymeric substrates is an essential requirement for quality control in industrial graphene production. Here we show that it is possible to measure the sheet conductivity of graphene on polymer films by terahertz time-domain spectroscopy (THz-TDS) when all internally reflected echoes in the substrate are taken into consideration. The conductivity measured by THz-TDS is comparable to values obtained from four point probe measurements. THz-TDS maps of 25x30 cm 2 area graphene films were recorded and the DC conductivity and carrier scattering time were extracted from the measurements. Additionally, the THz-TDS conductivity maps highlight tears and holes in the graphene film, which are not easily visible by optical inspection.

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