Electro-optical interfacial effects on a graphene/?-conjugated organic semiconductor hybrid system.

ABSTRACT: The influence of graphene and retinoic acid (RA) - a ?-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 ?-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 ?-conjugated nanomaterial-based hybrid systems.

SUBMITTER: Araujo KAS 

PROVIDER: S-EPMC5870164 | biostudies-other | 2018

REPOSITORIES: biostudies-other