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Moiré lattice of twisted bilayer graphene as template for non-covalent functionalization

We present a novel approach to achieve spatial variations in the degree of non-covalent functionalization of twisted bilayer graphene (tBLG). The tBLG with twist angles varying between 5° and 7° was non-covalently functionalized with 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile (HATCN) molecules...

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Main Authors: Dierke, Tobias (Author) , Wolff, Stefan (Author) , Gillen, Roland (Author) , Eisenkolb, Jasmin (Author) , Nagel, Tamara (Author) , Maier, Sabine (Author) , Kivala, Milan (Author) , Hauke, Frank (Author) , Hirsch, Andreas (Author) , Maultzsch, Janina (Author)
Format: Article (Journal)
Language:English
Published: January 10, 2025
In: Angewandte Chemie. International edition
Year: 2025, Volume: 64, Issue: 2, Pages: 1-7
ISSN:1521-3773
DOI:10.1002/anie.202414593
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1002/anie.202414593
Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.202414593
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Author Notes:Tobias Dierke, Stefan Wolff, Roland Gillen, Jasmin Eisenkolb, Tamara Nagel, Sabine Maier, Milan Kivala, Frank Hauke, Andreas Hirsch, and Janina Maultzsch
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Summary:We present a novel approach to achieve spatial variations in the degree of non-covalent functionalization of twisted bilayer graphene (tBLG). The tBLG with twist angles varying between 5° and 7° was non-covalently functionalized with 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile (HATCN) molecules. Our results show a correlation between the degree of functionalization and the twist angle of tBLG. This correlation was determined through Raman spectroscopy, where areas with larger twist angles exhibited a lower HATCN peak intensity compared to areas with smaller twist angles. We suggest that the HATCN adsorption follows the moiré pattern of tBLG by avoiding AA-stacked areas and attach predominantly to areas with a local AB-stacking order of tBLG, forming an overall ABA-stacking configuration. This is supported by density functional theory (DFT) calculations. Our work highlights the role of the moiré lattice in controlling the non-covalent functionalization of tBLG. Our approach can be generalized for designing nanoscale patterns on two-dimensional (2D) materials using moiré structures as a template. This could facilitate the fabrication of nanoscale devices with locally controlled varying chemical functionality.
Item Description:Zuerst veröffentlicht: 26. November 2024
Gesehen am 07.03.2025
Physical Description:Online Resource
ISSN:1521-3773
DOI:10.1002/anie.202414593

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