Evidence for Electron Transfer between Graphene and Non-Covalently Bound π-Systems.
doping
functionalization
graphene
sensors
trication
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765
Titre abrégé: Chemistry
Pays: Germany
ID NLM: 9513783
Informations de publication
Date de publication:
20 May 2020
20 May 2020
Historique:
received:
29
01
2020
revised:
19
03
2020
pubmed:
1
4
2020
medline:
1
4
2020
entrez:
1
4
2020
Statut:
ppublish
Résumé
Hybridizing graphene and molecules possess a high potential for developing materials for new applications. However, new methods to characterize such hybrids must be developed. Herein, the wet-chemical non-covalent functionalization of graphene with cationic π-systems is presented and the interaction between graphene and the molecules is characterized in detail. A series of tricationic benzimidazolium salts with various steric demand and counterions was synthesized, characterized and used for the fabrication of graphene hybrids. Subsequently, the doping effects were studied. The molecules are adsorbed onto graphene and studied by Raman spectroscopy, XPS as well as ToF-SIMS. The charged π-systems show a p-doping effect on the underlying graphene. Consequently, the tricationic molecules are reduced through a partial electron transfer process from graphene, a process which is accompanied by the loss of counterions. DFT calculations support this hypothesis and the strong p-doping could be confirmed in fabricated monolayer graphene/hybrid FET devices. The results are the basis to develop sensor applications, which are based on analyte/molecule interactions and effects on doping.
Identifiants
pubmed: 32227533
doi: 10.1002/chem.202000488
pmc: PMC7317416
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
6694-6702Subventions
Organisme : Deutsche Forschungsgemeinschaft
ID : 392444269
Organisme : Chalmers Tekniska Högskola
ID : Research Grant, CMSI
Informations de copyright
© 2020 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.
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