Controlled Sixfold Symmetric Exfoliation of Oriented MoS2 Monolayers by Coulomb Force

Author:

Liu Sheng1ORCID,Fong Chee Fai23,Liu Xue4,Tan Beng Hau5,Zeng Qingyun6,Okada Yoshinori1,Nguyen Nam‐Trung7,An Hongjie7

Affiliation:

1. Quantum Materials Science Unit Okinawa Institute of Science and Technology Graduate University Okinawa 904‐0495 Japan

2. Nanoscale Quantum Photonics Laboratory RIKEN Cluster for Pioneering Research Saitama 351‐0198 Japan

3. Quantum Optoelectronics Research Team RIKEN Center for Advanced Photonics Saitama 351‐0198 Japan

4. Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science and Information Technology, Anhui University Hefei 230601 China

5. Low Energy Electronic Systems Singapore‐MIT Alliance for Research and Technology Singapore 138602 Singapore

6. College of Shipbuilding Engineering Harbin Engineering University Harbin 150001 China

7. Queensland Micro and Nanotechnology Centre Griffith University 170 Kessels Road Nathan Queensland 4111 Australia

Abstract

AbstractAtoms, molecules, and nanoparticles can be spatially manipulated by an atomic force microscopy (AFM) tip, through van der Waals (vdW) and/or Coulomb forces. These point‐to‐point manipulations are highly accurate at nanoscale, facilitating the construction and modification of nanostructures. Nevertheless, it is difficult to manipulate 2D layers in vdW crystals by an AFM tip, because the tip‐induced attractive force is usually insufficient to outcompete the interlaminar vdW forces. Herein, manipulation of the surface layers on a MoS2 single crystal by a conductive AFM tip is successfully reported. By applying a bias between the tip and MoS2, the Coulomb attractive force allows the topmost MoS2 layers to be picked up. These exfoliated layers are deformed into micron‐sized bubbles with sixfold symmetry, which are composed of high‐quality monolayers and visually reflecting the hexagonal lattice orientation. The underlying mechanisms of the sixfold symmetric exfoliation and the formation of monolayers are discussed by in situ monitoring of the tunneling volt‐ampere characteristics and simulation of the force distribution. The findings open a new route to obtain high‐quality transition metal dichalcogenide (TMD) monolayers and their derived nanostructures on the surface of TMD single crystals for optoelectronic and photonic device applications.

Funder

Anhui University of Finance and Economics

Japan Society for the Promotion of Science

Publisher

Wiley

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