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

研究成果: Article査読

3 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)11214-11223
ページ数10
ジャーナルACS Nano
13
10
DOI
出版ステータスPublished - 2019 10 22
外部発表はい

ASJC Scopus subject areas

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

フィンガープリント 「Tunable Chemical Coupling in Two-Dimensional van der Waals Electrostatic Heterostructures」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル