Optimization of graphene oxide layer-by-layer films to be used as an enhancer coating of optical fibers sensors

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Abstract

The stability of Graphene oxide (GO) layers obtained by the layer-by-layer (LbL) films was investigated having in view the development of tunnable surfaces for optical fibre sensors in aqueous environments. For this purpose layer-by-layer (LbL) films based polyethylenimine (PEI) and GO, were prepared and characterized. The kinetics of adsorption of PEI/GO LBL films revealed that the adsorbed amount per bilayer increases linearly with the number of bilayers as expected. Furthermore adsorbed amount per bilayer for short adsorption times tends to a constant value revealing that GO layer growth also follows the adsorption behaviour expected polyelectrolytes in which electrostatic interaction is ruling the process. Finally desorption studies carried out to infer about GO layer stability revealed that GO layers are more stable at higher solutions pHs and if the adsorption time for each layer is short. These results/conclusions allowed to infer on the possible range of applications of PEI/GO LbL films.

Original languageEnglish
Title of host publicationPHOTOPTICS 2020 - Proceedings of the 8th International Conference on Photonics, Optics and Laser Technology
EditorsPablo Albella, Maria Raposo, David Andrews, Paulo Ribeiro
PublisherSciTePress
Pages192-195
Number of pages4
ISBN (Electronic)9789897584015
DOIs
Publication statusPublished - 2020
Event8th International Conference on Photonics, Optics and Laser Technology, PHOTOPTICS 2020 - Valletta, Malta
Duration: 27 Feb 202029 Feb 2020

Conference

Conference8th International Conference on Photonics, Optics and Laser Technology, PHOTOPTICS 2020
CountryMalta
CityValletta
Period27/02/2029/02/20

Keywords

  • Adsorption
  • Desorption
  • Graphene Oxide
  • Layer-by-Layer Films
  • Optical Fiber Sensors

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