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Related Experiment Video

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Pattern Pick and Place Method for Twisted Bi- and Multi-Layer Graphene.

Jae-Young Lim1, Hyeon-Sik Jang1, Hyun-Jae Yoo1

  • 1SKKU Advanced Institute of Nanotechnology (SAINT) and School of Advanced Materials Science and Engineering Sungkyunkwan University (SSKU), 2066, Seobu-Ro, Jangan-Gu, Suwon-Si, Gyeonggi-Do 16419, Korea.

Materials (Basel, Switzerland)
|November 27, 2019
PubMed
Summary

Researchers developed a new method to precisely control the twist angle in twisted bi-layer graphene (tBLG). This facile pick-and-place technique enables controlled fabrication of tBLG and twisted multi-layer graphene (tMLG) with tunable properties.

Keywords:
2D superlatticegraphene transfertwisted bi-layer graphene

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Twisted bi-layer graphene (tBLG) exhibits unique electronic and optical properties influenced by its interlayer twist angle.
  • Conventional fabrication methods struggle with precise control over the twist angle in tBLG.
  • Accurate control of twist angles is crucial for tailoring tBLG properties.

Purpose of the Study:

  • To introduce a facile and accurate method for fabricating twisted bi-layer graphene (tBLG) and twisted multi-layer graphene (tMLG).
  • To enable precise control over the interlayer twist angle during graphene stacking.
  • To investigate the structural, optical, and electrical properties of tBLG and tMLG as a function of twist angle and layer number.

Main Methods:

  • Developed a pick-and-place fabrication technique for stacking single-crystalline graphene layers.
  • Utilized direct dry transfer to place a top graphene layer onto a bottom layer with a pre-designed twist angle.
  • Employed transmission electron microscopy (TEM), micro-Raman spectroscopy, and gate-dependent sheet resistance measurements for characterization.

Main Results:

  • Successfully fabricated uniform tBLG and tMLG with controlled and pre-defined twist angles.
  • Demonstrated minimal interlayer contamination using the direct dry transfer method.
  • Observed distinct structural, optical, and electrical properties correlating with twist angle and layer number.

Conclusions:

  • The pick-and-place approach offers a facile and effective route for fabricating tBLG and tMLG with precise twist angle control.
  • This method allows for the systematic study of twist angle-dependent properties in multi-layer graphene systems.
  • The technique minimizes interlayer contamination, leading to more reliable material properties.