Journal article
Understanding and optimising the packing density of perylene bisimide layers on CVD-grown graphene
Publication Details
Authors: | Backes, C.; Winters, S.; Berner, N.; Yim, C.; Duembgen, K.; Kaminska, I.; Mackowski, S.; Cafolla, A.; Hirsch, A.; Duesberg, G. |
Publisher: | ROYAL SOC CHEMISTRY |
Publication year: | 2015 |
Journal: | Nanoscale |
Pages range : | 16337-16342 |
Volume number: | 7 |
Issue number: | 39 |
Start page: | 16337 |
End page: | 16342 |
Number of pages: | 6 |
ISSN: | 2040-3364 |
DOI-Link der Erstveröffentlichung: |
Abstract
The non-covalent functionalisation of graphene is an attractive strategy to alter the surface chemistry of graphene without damaging its superior electrical and mechanical properties. Using the facile method of aqueous-phase functionalisation on large-scale CVD-grown graphene, we investigated the formation of different packing densities in self-assembled monolayers (SAMs) of perylene bisimide derivatives and related this to the amount of substrate contamination. We were able to directly observe wet-chemically deposited SAMs in scanning tunnelling microscopy (STM) on transferred CVD graphene and revealed that the densely packed perylene ad-layers adsorb with the conjugated p-system of the core perpendicular to the graphene substrate. This elucidation of the non-covalent functionalisation of graphene has major implications on controlling its surface chemistry and opens new pathways for adaptable functionalisation in ambient conditions and on the large scale.
The non-covalent functionalisation of graphene is an attractive strategy to alter the surface chemistry of graphene without damaging its superior electrical and mechanical properties. Using the facile method of aqueous-phase functionalisation on large-scale CVD-grown graphene, we investigated the formation of different packing densities in self-assembled monolayers (SAMs) of perylene bisimide derivatives and related this to the amount of substrate contamination. We were able to directly observe wet-chemically deposited SAMs in scanning tunnelling microscopy (STM) on transferred CVD graphene and revealed that the densely packed perylene ad-layers adsorb with the conjugated p-system of the core perpendicular to the graphene substrate. This elucidation of the non-covalent functionalisation of graphene has major implications on controlling its surface chemistry and opens new pathways for adaptable functionalisation in ambient conditions and on the large scale.
