Tunable Chemical Coupling in Two-Dimensional van der Waals Electrostatic Heterostructures
| Autor: | Leanddas Nurdiwijayanto, Yu Kobayashi, Yasuo Ebina, Takaaki Taniguchi, Kazuhito Tsukagoshi, Takayoshi Sasaki, Tetsuki Saito, Minoru Osada, Hiroyuki Yokoi, Shisheng Li, Kenji Watanabe, Koichiro Saiki, Seiji Obata, Yasumitsu Miyata, Takashi Taniguchi |
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| Rok vydání: | 2019 |
| Předmět: |
Graphene
Exciton General Engineering General Physics and Astronomy Heterojunction 02 engineering and technology Dielectric Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Condensed Matter::Materials Science symbols.namesake law Chemical physics Monolayer Physics::Atomic and Molecular Clusters symbols General Materials Science Trion van der Waals force 0210 nano-technology Luminescence |
| Zdroj: | ACS Nano. 13:11214-11223 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.9b04256 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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