Understanding and optimising the packing density of perylene bisimide layers on CVD-grown graphene
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 {\pi}-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.
Keywords
Cite
@article{arxiv.1507.04525,
title = {Understanding and optimising the packing density of perylene bisimide layers on CVD-grown graphene},
author = {Nina C. Berner and Sinéad Winters and Claudia Backes and Chanyoung Yim and Kim C. Dümbgen and Izabela Kaminska and Sebastian Mackowski and Attilio A. Cafolla and Andreas Hirsch and Georg S. Duesberg},
journal= {arXiv preprint arXiv:1507.04525},
year = {2015}
}
Comments
27 pages (including SI), 10 figures