Ms. Cristina Cunha Profile

Cristina Cunha

at Inesctec

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Proceedings Article | 20 June 2024 Presentation + Paper

Coreless silica fiber sensor based on self-image theory and coated with graphene oxide

Cristina Cunha, Catarina Monteiro, António Vaz, Susana Silva, Orlando Frazão, Susana Novais

Proceedings Volume 12999, 1299905 (2024) https://doi.org/10.1117/12.3022374

KEYWORDS: Sensors, Glucose, Graphene, Oxides, Optical fibers, Design, Single mode fibers, Refractive index, Reflection, Coating

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This work provides a method that combines graphene oxide coating and self-image theory to improve the sensitivity of optical sensors. The sensor is designed specifically to measure the amount of glucose present quantitatively in aqueous solutions that replicate the range of glucose concentrations found in human saliva. COMSOL Multiphysics 6.0 was used to simulate the self-imaging phenomenon using a coreless silica fiber (CSF). For high-quality self-imaging, the second and fourth self-imaging points are usually preferred because of their higher coupling efficiency, which increases the sensor sensitivity. However, managing the fourth self-image is more difficult because it calls for a longer CSF length. As a result, the first and second self-image points were the focus of the simulation in this work. After the simulation, using the Layerby- Layer method, the sensor was constructed to a length that matched the second self-image point (29.12 mm) and coated with an 80 μm/mL graphene oxide layer. When comparing uncoated and graphene oxide-covered sensors to measure glucose in liquids ranging from 25 to 200 mg/dL, one bilayer of polyethyleneimine/graphene demonstrated an eight-fold improvement in sensitivity. The final sensor, built on graphene oxide, showed stability with a low standard deviation of 0.6 pm/min. It also showed sensitivity at 10.403 ± 0.004 pm/(mg/dL) with a limit of detection of 9.15 mg/dL.

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