Electro-optical interfacial effects on a graphene/π-conjugated organic semiconductor hybrid system.
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Date
2018
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Abstract
The influence of graphene and retinoic acid (RA) – a π-conjugated organic semiconductor – interface on their hybrid system is investigated.
The physical properties of the interface are assessed via scanning probe microscopy, optical spectroscopy (photoluminescence
and Raman) and ab initio calculations. The graphene/RA interaction induces the formation of a well-organized π-conjugated
self-assembled monolayer (SAM) at the interface. Such structural organization leads to the high optical emission efficiency of
the RA SAM, even at room temperature. Additionally, photo-assisted electrical force microscopy, photo-assisted scanning Kelvin
probe microscopy and Raman spectroscopy indicate a RA-induced graphene doping and photo-charge generation. Finally, the
optical excitation of the RA monolayer generates surface potential changes on the hybrid system. In summary, interface-induced
organized structures atop 2D materials may have an important impact on both design and operation of π-conjugated nanomaterialbased
hybrid systems.
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Keywords
DFT calculations, Scanning probe microscopy, Self-assembly
Citation
ARAUJO, K. A. de S. et al. Electro-optical interfacial effects on a graphene/π-conjugated organic semiconductor hybrid system. Beilstein Journal of Nanotechnology, v. 9, p. 963-974, mar. 2018. Disponível em: <https://www.beilstein-journals.org/bjnano/articles/9/90>. Acesso em: 16 jun. 2018.