Thickness-dependent frictional behavior of topological insulator Bi 2 Se 3 nanoplates
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Thickness‑dependent frictional behavior of topological insulator Bi2Se3 nanoplates Ruijian Zhu1,2 · Zengmei Wang3 · Quanzhou Yao4 · Qunyang Li4,5 · Zhenxiang Cheng6 · Xinli Guo3 · Tong Zhang3 · Xiaoshuai Li3 · Hideo Kimura7 · Takao Matsumoto8 · Naoya Shibata8 · Yuichi Ikuhara8 Received: 5 January 2020 / Accepted: 5 March 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Two-dimensional Bi2Se3 TIs were recently found to be the most promising room-temperature topological insulators for its relatively large bulk gap, but its surface frictional response is little investigated. Here, we prepared single-crystalline Bi2Se3 nanoplates with a lateral dimension up to ~ 1 μm and a thickness of less than 200 nm via a simple polyol method, and the molecular structure and morphology were characterized in detail using different methods. The micro-frictional behavior of Bi2Se3 nanoplates with different thickness is inventively investigated with AFM technique. The atomic stick–slip friction stemming from periodic crystal lattice, and the larger friction force of thinner nanoplates is attributed to the larger adhesion force and enhanced energy dissipation. This work has, for the first time, built the link of the behavior of topological protected surface and mechanical friction behavior of Bi2Se3. Keywords Bi2Se3 nanoplates · Topological insulators · Surface metallic state · Atomic stick–slip friction · Thicknessdependent friction properties
1 Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00339-020-3452-5) contains supplementary material, which is available to authorized users.
Topological insulators (TIs) represent a new class of unconventional quantum matter exhibiting as a gapped insulator in the bulk while possessing robust, nontrivial and spinpolarized, and time-reversal-symmetry protected metallic
* Zengmei Wang [email protected]
4
AML, CNMM, School of Aerospace Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
* Qunyang Li [email protected]
5
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, People’s Republic of China
* Zhenxiang Cheng [email protected]
6
Institute for Superconducting and Electronics Materials, University of Wollongong, Innovation Campus, Fairy Meadow, NSW 2519, Australia
7
National Institute for Materials Science (NIMS), Sengen 1‑2‑1, Tsukuba 305‑0047, Japan
8
Institute of Engineering Innovation, School of Engineering, The University of Tokyo, 2‑11‑16 Yayoi, Bunkyo‑ku, Tokyo 113‑8656, Japan
* Tong Zhang [email protected] 1
School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, People’s Republic of China
2
Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211167, People’s Republic of China
3
School of Materials Science and Engineering, Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, People’s Republi
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