Ponce-Alcantara, S;
Martin-Sanchez, D;
Kovylina, M;
Perez-Marquez, A;
Maudes, J;
Murillo, N;
Garcia-Ruperez, J;
(2019)
Dual Refractive Index and Viscosity Sensing Using Polymeric Nanofibers Optical Structures.
IEEE Sensors Journal
, 19
(24)
pp. 11850-11857.
10.1109/jsen.2019.2938832.
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Abstract
Porous materials have demonstrated to be ideal candidates for the creation of optical sensors with very high sensitivities. This is due both to the possibility of infiltrating the target substances into them and to their notable surface-to-volume ratio that provides a larger biosensing area. Among porous structures, polymeric nanofibers (NFs) layers fabricated by electrospinning have emerged as a very promising alternative for the creation of low-cost and easy-to-produce high performance optical sensors, for example, based on Fabry-Pérot (FP) interferometers. However, the sensing performance of these polymeric NFs sensors is limited by the low refractive index contrast between the NFs porous structure and the target medium when performing in-liquid sensing experiments, which determines a very low amplitude of the FP interference fringes appearing in the spectrum. This problem has been solved with the deposition of a thin metal layer (~ 3 nm) over the NFs sensing layer. We have successfully used these metal-coated FP NFs sensors to perform several real-time and in-flow refractive index sensing experiments. From these sensing experiments, we have also determined that the sponge-like structure of the NFs layer suffers an expansion/compression process that is dependent of the viscosity of the analyzed sample, what thus gives the possibility to perform a simultaneous dual sensing of refractive index and viscosity of a fluid.
| Type: | Article |
|---|---|
| Title: | Dual Refractive Index and Viscosity Sensing Using Polymeric Nanofibers Optical Structures |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/jsen.2019.2938832 |
| Publisher version: | https://doi.org/10.1109/JSEN.2019.2938832 |
| Language: | English |
| Additional information: | © 2019 IEEE. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Optical sensors, Refractive index, Sensitivity, Reflectivity, Metals, Optical refraction |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10087362 |
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