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<p>Thin films fabricated from solution-processed graphene nanosheets are of considerable technological interest for a wide variety of applications, such as transparent conductors, supercapacitors, and memristors. However, very thin printed films tend to have low conductivity compared to thicker ones. In this work, we demonstrate a simple layer-by-layer deposition method which yields thin films of highly-aligned, electrochemically-exfoliated graphene which have low roughness and nanometer-scale thickness control. By optimising the deposition parameters, we demonstrate films with high conductivity (1.3 × 10<sup>5 </sup>S/m) at very low thickness (11 nm). Finally, we connect our high conductivities to low inter-nanosheet junction resistances (R<sub>J</sub>), which we estimate at R<sub>J</sub> ~ 1kΩ.</p>

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Layer-by-layer assembly yields thin graphene films with near theoretical conductivity

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月8日

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  • Oran Cassidy,
  • Kevin Synnatschke,
  • Jose M. Munuera,
  • Cian Gabbett,
  • Tian Carey,
  • Luke Doolan,
  • Eoin Caffrey,
  • Jonathan N. Coleman

摘要

Thin films fabricated from solution-processed graphene nanosheets are of considerable technological interest for a wide variety of applications, such as transparent conductors, supercapacitors, and memristors. However, very thin printed films tend to have low conductivity compared to thicker ones. In this work, we demonstrate a simple layer-by-layer deposition method which yields thin films of highly-aligned, electrochemically-exfoliated graphene which have low roughness and nanometer-scale thickness control. By optimising the deposition parameters, we demonstrate films with high conductivity (1.3 × 105 S/m) at very low thickness (11 nm). Finally, we connect our high conductivities to low inter-nanosheet junction resistances (RJ), which we estimate at RJ ~ 1kΩ.