Controlling Structural Anisotropy of Anisotropic 2D Layers in Pseudo-1D/2D Material Heterojunctions

Bin Chen, Kedi Wu, Aslihan Suslu, Sijie Yang, Hui Cai, Aliya Yano, Emmanuel Soignard, Toshihiro Aoki, Katia March, Yuxia Shen, Sefaattin Tongay

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Chemical vapor deposition and growth dynamics of highly anisotropic 2D lateral heterojunctions between pseudo-1D ReS2 and isotropic WS2 monolayers are reported for the first time. Constituent ReS2 and WS2 layers have vastly different atomic structure, crystallizing in anisotropic 1T′ and isotropic 2H phases, respectively. Through high-resolution scanning transmission electron microscopy, electron energy loss spectroscopy, and angle-resolved Raman spectroscopy, this study is able to provide the very first atomic look at intimate interfaces between these dissimilar 2D materials. Surprisingly, the results reveal that ReS2 lateral heterojunctions to WS2 produce well-oriented (highly anisotropic) Re-chains perpendicular to WS2 edges. When vertically stacked, Re-chains orient themselves along the WS2 zigzag direction, and consequently, Re-chains exhibit six-fold rotation, resulting in loss of macroscopic scale anisotropy. The degree of anisotropy of ReS2 on WS2 largely depends on the domain size, and decreases for increasing domain size due to randomization of Re-chains and formation of ReS2 subdomains. Present work establishes the growth dynamics of atomic junctions between novel anisotropic/isotropic 2D materials, and overall results mark the very first demonstration of control over anisotropy direction, which is a significant leap forward for large-scale nanomanufacturing of anisotropic systems.

Original languageEnglish (US)
Article number1701201
JournalAdvanced Materials
Volume29
Issue number34
DOIs
StatePublished - Sep 13 2017

Keywords

  • HRSTEM
  • chemical vapor deposition
  • heterostructures
  • rhenium disulfide

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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    Chen, B., Wu, K., Suslu, A., Yang, S., Cai, H., Yano, A., Soignard, E., Aoki, T., March, K., Shen, Y., & Tongay, S. (2017). Controlling Structural Anisotropy of Anisotropic 2D Layers in Pseudo-1D/2D Material Heterojunctions. Advanced Materials, 29(34), [1701201]. https://doi.org/10.1002/adma.201701201