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Research Article

Nonlinear electronic and ultrafast optical signatures in chemical vapor-deposited ultrathin PtS2 ribbons

Shaolong Jiang1,§( )Jin Yang2,3,§Liang Zhu1Jiafeng Xie4Weiteng Guo1Erding Zhao1Chaoyu Chen5,6Tianwu Wang4Fuhai Su2( )Yanfeng Zhang7( )Junhao Lin1( )
Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
University of Science and Technology of China, Hefei 230026, China
Great Bay Area Research Institute, Aerospace Information Research Institute (AIR) of Chinese Academy of Science (CAS), Guangzhou 510700, China
Shenzhen Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
International Quantum Academy, and Shenzhen Branch, Hefei National Laboratory, Futian District, Shenzhen 518048, China
School of Materials Science and Engineering, Peking University, Beijing 100871, China

§ Shaolong Jiang and Jin Yang contributed equally to this work.

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Graphical Abstract

Ultrathin 1T-PtS2 ribbons with thickness centralized almost at 1L–4L and large domain size up to 210 µm are synthesized on Au foils using chemical vapor deposition (CVD) technique. The electron and optical absorption properties of PtS2 are investigated using electron energy loss spectroscopy (EELS) and optical pump-probe spectroscopy (OPPS), showing strong nonlinear layer-dependent responses.

Abstract

The emerging two-dimensional (2D) platinum disulfide (PtS2) has driven increasing attentions due to its high electron mobility, good air-stability, and strong interlayer interaction which leads to a widely tunable electronic structure. However, a detailed study on its covalent-like layer-dependent properties remains infant. Herein, we demonstrate the successful production of ultrathin 1T-PtS2 ribbons with thickness centralized almost at monolayer 1L–4L and large domain size up to 210 µm on Au foils using chemical vapor deposition (CVD) technique, which enables macro- and microscopic study of its extraordinary layer-dependent features with precise control of the number of layers. Using electron energy loss spectroscopy (EELS) and optical pump-probe spectroscopy (OPPS), we reveal that both the electron and ultrafast optical absorption signals of the as-grown 2D PtS2 show strong nonlinear layer-dependent responses which manifest discriminated transition in 1L–4L PtS2 ribbons. The layer-dependent nonlinear response of 2D PtS2 can be well interpreted in the frame of calculated electron and phonon structures. These achievements offer a platform for successfully fabricating large-sized ultrathin 2D PtS2 and facilitating our knowledge about its electronic and optoelectronic properties.

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Nano Research
Pages 4366-4373
Cite this article:
Jiang S, Yang J, Zhu L, et al. Nonlinear electronic and ultrafast optical signatures in chemical vapor-deposited ultrathin PtS2 ribbons. Nano Research, 2022, 15(5): 4366-4373. https://doi.org/10.1007/s12274-022-4168-y
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Received: 14 December 2021
Revised: 09 January 2022
Accepted: 17 January 2022
Published: 24 February 2022
© Tsinghua University Press 2022
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