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Τίτλος: Laser-induced graphene from commercial polyimide coated optical fibers for sensor development
Συγγραφείς: Martins, Luís 
Kulyk, Bohdan 
Theodosiou, Antreas 
Ioannou, Andreas 
Moreirinha, Catarina 
Kalli, Kyriacos 
Santos, Nuno 
Costa, Florinda 
Pereira, Sónia O. 
Marques, Carlos 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Λέξεις-κλειδιά: Commercial polyimide fiber;Laser induced graphene;Process graphene on fiber;Sensors
Ημερομηνία Έκδοσης: 1-Μαΐ-2023
Πηγή: Optics and Laser Technology, 2023, vol. 160
Volume: 160
Περίληψη: Direct laser scribing (DLS) technology is applied to commercial polyimide (PI) coated optical fibers producing laser-induced graphene (LIG) coated optical fibers. The PI-coated optical fiber is first inscribed with off-center Bragg gratings via point-by-point method using a femtosecond laser system. Then, the off-center Bragg grating is irradiated with a CO2 laser and the PI coating is photothermally converted into LIG without affecting the grating. Scanning electron microscopy (SEM) and Raman spectroscopy prove the presence of the laser-induced graphene layer on the optical fiber, and Fourier transform infrared (FTIR) spectroscopy confirms that all the PI coating was converted into LIG. The resulting LIG-coated off-center Bragg grating (FBG) sensors respond to variations of the surrounding refractive index (RI) with a sensitivity of 38.08 ± 1.57 nm per RI units (RIU). In addition, after removal of the PI coating, obtaining a bare-FBG, the sensitivity decreases to 25.63 ± 0.66 nm RIU−1. Therefore, this strategy, here reported for the first time, paves the way to produce promising novel optical transducers aiming to develop bio- and chem-sensing devices.
URI: https://hdl.handle.net/20.500.14279/29563
ISSN: 00303992
DOI: 10.1016/j.optlastec.2022.109047
Rights: © Elsevier B.V.
Attribution-NonCommercial-NoDerivatives 4.0 International
Type: Article
Affiliation: University of Aveiro 
Cyprus University of Technology 
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