Back to Search
Start Over
Evidence for electron transfer between graphene and non‐covalently bound π‐systems
- Source :
- Chemistry (Weinheim an Der Bergstrasse, Germany)
- Publication Year :
- 2020
- Publisher :
- Freie Universität Berlin, 2020.
-
Abstract
- 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.<br />Organic star‐shaped tricationic molecules interact with graphene and a one‐electron transfer from graphene to the molecules leads to strong p‐doping.
- Subjects :
- Steric effects
doping
010402 general chemistry
sensors
01 natural sciences
Catalysis
law.invention
Electron transfer
symbols.namesake
X-ray photoelectron spectroscopy
trication
law
Molecule
Full Paper
010405 organic chemistry
Chemistry
Graphene
Organic Chemistry
graphene
General Chemistry
Full Papers
0104 chemical sciences
500 Naturwissenschaften und Mathematik::540 Chemie::547 Organische Chemie
Chemical physics
Covalent bond
symbols
Surface modification
functionalization
Graphene | Hot Paper
Raman spectroscopy
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Chemistry (Weinheim an Der Bergstrasse, Germany)
- Accession number :
- edsair.doi.dedup.....fa2a596d3cbf7dffa1a1d357bbd29f20