Method of Mechanical Exfoliation of Bismuth with Micro-Trench Structures

The discovery of graphene led to a burst in search for 2D materials originating from layered atomic crystals coupled by van der Waals force. While bulk bismuth crystals share this layered crystal structure, unlike other group V members of the periodic table, its interlayer bonds are stronger such th...

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Bibliographic Details
Published in:arXiv.org 2023-12
Main Authors: Yu, Oulin, Allgayer, Raphaela, Godin, Simon, Lalande, Jacob, Fossati, Paolo, Hsu, Chunwei, Szkopek, Thomas, Gervais, Guillaume
Format: Article
Language:English
Subjects:
Bismuth
Bonding strength
Cleavage
Crystal structure
Exfoliation
Graphene
Interlayers
Periodic table
Raman spectroscopy
Silicon dioxide
Stress concentration
Two dimensional materials
Van der Waals forces
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Summary:The discovery of graphene led to a burst in search for 2D materials originating from layered atomic crystals coupled by van der Waals force. While bulk bismuth crystals share this layered crystal structure, unlike other group V members of the periodic table, its interlayer bonds are stronger such that traditional mechanical cleavage and exfoliation techniques have shown to be inefficient. In this work, we present a novel mechanical cleavage method for exfoliating bismuth by utilizing the stress concentration effect induced by micro-trench SiO2 structures. As a result, the exfoliated bismuth flakes can achieve thicknesses down to the sub-10 nm range which are analyzed by AFM and Raman spectroscopy.
ISSN:2331-8422
DOI:10.48550/arxiv.2311.01321