Tunable Chemical Coupling in Two-Dimensional van der Waals Electrostatic Heterostructures

Takaaki Taniguchi, Shisheng Li, Leanddas Nurdiwijayanto, Yu Kobayashi, Tetsuki Saito, Yasumitsu Miyata, Seiji Obata, Koichiro Saiki, Hiroyuki Yokoi, Kenji Watanabe, Takashi Taniguchi, Kazuhito Tsukagoshi, Yasuo Ebina, Takayoshi Sasaki, Minoru Osada

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Heterostructures of two-dimensional (2D) atomic crystals provide fascinating molecular-scale design elements for emergent physical phenomena and functional materials, as integrating distinct monolayers into vertical heterostructures can afford coupling between disparate properties. However, the available examples have been limited to either van der Waals (vdW) or electrostatic (ES) heterostructures that are solely composed of noncharged and charged monolayers, respectively. Here, we propose a "vdW-ES heterostructure" chemical design in which charge-neutral and charged monolayer-building blocks with highly disparate chemical and physical properties are conjugated vertically through asymmetrically charged interfaces. We demonstrate vdW-ES heteroassembly of semiconducting MoS2 and dielectric Ca2Nb3O10 - (CNO) monolayers using an amphipathic molecular starch, resulting in the emergence of trion luminescence observed at the lowest energy among MoS2-related materials, probably due to interfacial confinement effects given by vdW-ES dual interactions. In addition, interface engineering leads to tailored exciton of the vdW/ES heterostructures owing to the pronounced dielectric proximity effects, bringing an intriguing interlayer chemistry to modify 2D materials. Furthermore, the current approach was successfully extended to create a graphene/CNO heterostructure, which verifies the versatility of the preparative method.

Original languageEnglish
Pages (from-to)11214-11223
Number of pages10
JournalACS Nano
Volume13
Issue number10
DOIs
Publication statusPublished - Oct 22 2019
Externally publishedYes

Keywords

  • graphene
  • heterostructure
  • interface
  • metal oxide
  • MoS
  • nanosheets
  • two-dimensional materials

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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  • Cite this

    Taniguchi, T., Li, S., Nurdiwijayanto, L., Kobayashi, Y., Saito, T., Miyata, Y., Obata, S., Saiki, K., Yokoi, H., Watanabe, K., Taniguchi, T., Tsukagoshi, K., Ebina, Y., Sasaki, T., & Osada, M. (2019). Tunable Chemical Coupling in Two-Dimensional van der Waals Electrostatic Heterostructures. ACS Nano, 13(10), 11214-11223. https://doi.org/10.1021/acsnano.9b04256