Vibrational Property of α-Borophene Determined by Tip-Enhanced Raman Spectroscopy

Ping Zhang; Xirui Tian; Shaoxiang Sheng; Chen Ma; Linjie Chen; Baojie Feng; Peng Cheng; Yiqi Zhang; Lan Chen; Jin Zhao; Kehui Wu

doi:10.3390/molecules27030834

Vibrational Property of α-Borophene Determined by Tip-Enhanced Raman Spectroscopy

Molecules. 2022 Jan 27;27(3):834. doi: 10.3390/molecules27030834.

Authors

Ping Zhang^{1

2}, Xirui Tian³, Shaoxiang Sheng^{1

2}, Chen Ma^{1

2}, Linjie Chen⁴, Baojie Feng^{1

2}, Peng Cheng^{1

2}, Yiqi Zhang^{1

2}, Lan Chen^{1

2}, Jin Zhao⁵, Kehui Wu^{1

2

6}

Affiliations

¹ Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
² School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.
³ Department of Physics, University of Science and Technology of China, Hefei 230026, China.
⁴ Department of Chemical Physics, School of Chemistry, University of Science and Technology of China, Hefei 230026, China.
⁵ CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei 230026, China.
⁶ Songshan Lake Materials Laboratory, Dongguan 523808, China.

Abstract

We report a Raman characterization of the α borophene polymorph by scanning tunneling microscopy combined with tip-enhanced Raman spectroscopy. A series of Raman peaks were discovered, which can be well related with the phonon modes calculated based on an asymmetric buckled α structure. The unusual enhancement of high-frequency Raman peaks in TERS spectra of α borophene is found and associated with its unique buckling when landed on the Ag(111) surface. Our paper demonstrates the advantages of TERS, namely high spatial resolution and selective enhancement rule, in studying the local vibrational properties of materials in nanoscale.

Keywords: borophene; density functional theory calculations; scanning tunneling microscopy; tip-enhanced Raman spectroscopy; vibrational modes.