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

• Autor(a) principal: Araujo, Karolline Aparecida de Souza
• Data de Publicação: 2018
• Outros Autores: Cury, Luiz Alberto, Matos, Matheus Josué de Souza, Fernandes, Thales Fernando Damasceno, Cançado, Luiz Gustavo de Oliveira Lopes, Neves, Bernardo Ruegger Almeida
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFOP
• Texto Completo: http://www.repositorio.ufop.br/handle/123456789/10473
• topic: DFT calculations; Scanning probe microscopy; Self-assembly

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.