A DFT and QTAIM study of the adsorption of organic molecules over the copper-doped coronene and circumcoronene

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018

Autores

Malcek, M (Autor) Outra; Natalia N D S Cordeiro (Autor) FCUP

Revista

Título: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES

Vol. 95

Páginas: 59-70

ISSN: 1386-9477

Indexação

ISI Web of Knowledge - 15 Citações

Scopus - 15 Citações

Outras Informações

ID Authenticus: P-00N-0MF

DOI: 10.1016/j.physe.2017.09.004

Abstract (EN): Graphene based materials are nowadays extensively studied because of their potential applications as gas sensors, biosensors or adsorbents. Doping the graphene surface with heteroatoms or transition metals can improve its electronic properties and chemical reactivity. Polyaromatic hydrocarbons coronene and circumcoronene can be used as models of tiny graphene quantum dots. The adsorption of a set of organic molecules (water, hydrogen peroxide, hydrogen sulfide, methanol, ethanol and oxygen molecule) over the copper-doped coronene and circumcoronene was theoretically studied using density functional theory (DFT) and quantum theory of atoms in molecules (QTAIM). In the case of coronene, only one site was considered for the Cu-doping, whereas in the case of circumcoronene being a polyaromatic hydrocarbon composed of 54 carbon atoms, three different sites for Cu-doping were considered. For the systems under study, the adsorption of O-2 was found energetically the most favorable, with energetic outcome ranging from -3.1 to -3.7 eV related to the position of dopant Cu atom. Changes in the topology of charge densities at Cu and in its vicinity after the adsorption of studied molecules were investigated in the framework of QTAIM. In addition, QTAIM analysis of bond critical points (BCP) was employed to study the character of the newly formed chemical bonds. The results of this study point out the suitability of Cu-doped graphene materials as sensors and/or adsorbents in practical applications.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12