Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers' Stability

• Tipo: Artigo em Revista Científica Internacional
• Data: 2021

Autores

Maria Raposo (Autor) Outra; Carlota Xavier (Autor) Outra; Catarina Monteiro (Autor) Outra; Susana Silva (Autor) FCUP; Orlando Frazão (Autor) FEUP; Paulo Zagalo (Autor) Outra; Paulo António Ribeiro (Autor) Outra

Revista

Título: Photonics

Vol. 8 Nº 3

Páginas: 1-12

Editora: MDPI

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Outras Informações

ID Authenticus: P-00T-JAK

DOI: 10.3390/photonics8030070

Abstract (EN): Thin graphene oxide (GO) film layers are being widely used as sensing layers in different types of electrical and optical sensor devices. GO layers are particularly popular because of their tuned interface reflectivity. The stability of GO layers is fundamental for sensor device reliability, particularly in complex aqueous environments such as wastewater. In this work, the stability of GO layers in layer-by-layer (LbL) films of polyethyleneimine (PEI) and GO was investigated. The results led to the following conclusions: PEI/GO films grow linearly with the number of bilayers as long as the adsorption time is kept constant; the adsorption kinetics of a GO layer follow the behavior of the adsorption of polyelectrolytes; and the interaction associated with the growth of these films is of the ionic type since the desorption activation energy has a value of 119 +/- 17 kJ/mol. Therefore, it is possible to conclude that PEI/GO films are suitable for application in optical fiber sensor devices; most importantly, an optical fiber-based interrogation setup can easily be adapted to investigate in situ desorption via a thermally stimulated process. In addition, it is possible to draw inferences about film stability in solution in a fast, reliable way when compared with the traditional ones.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12