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Proceedings Paper

Optical fiber lossy-mode resonance sensors with doped tin oxides for optical working electrode monitoring in electrochemical systems
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Paper Abstract

This work discusses optical fiber sensors based on lossy-mode resonance (LMR) effect and their potential for simultaneous sensing in multiple domains, i.e., optical and electrochemical. As electrically conductive materials able to guide lossy modes, two doped tin oxides, i.e., fluorine doped tin oxide (FTO) and indium tin oxide (ITO) thin films were employed. Since the ITO-LMR sensor has already been discussed broader, this work focuses on properties of the FTO-LMR sensor and brief comparison of devices based on the two materials. In optical domain the sensitivity to surrounding medium refractive index was determined by immersing the sensors in solutions of different refractive index. Both the sensors showed sensitivity of 300 nm/RIU in a refractive index range of approx. 1.33-1.39 RIU. Electrochemical measurements were performed in 0.01 M phosphate-buffered saline (PBS, pH 7.0) to identify the influence of the applied potential on the optical response of both sensors. In applied potential from -1.0 V to 1.0 V the FTO-LMR sensor reached LMR shift of 31.3 nm compared to 23.8 nm of the ITO-LMR one.

Paper Details

Date Published: 28 August 2019
PDF: 4 pages
Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111991O (28 August 2019); doi: 10.1117/12.2541354
Show Author Affiliations
Dariusz Burnat, Warsaw Univ. of Technology (Poland)
Marta Janczuk-Richter, Institute of Physical Chemistry (Poland)
Paweł Niedziałkowski, Univ. Gdansk (Poland)
Wioleta Białobrzeska, Univ. Gdansk (Poland)
Petr Sezemsky, Univ. of South Bohemia (Czech Republic)
Marcin Koba, Warsaw Univ. of Technology (Poland)
National Institute of Telecommunications (Poland)
Vitezslav Stranak, Univ. of South Bohemia (Czech Republic)
Robert Bogdanowicz, Gdansk Univ. of Technology (Poland)
Tadeusz Ossowski, Univ. Gdansk (Poland)
Joanna Niedziółka-Jönsson, Institute of Physical Chemistry (Poland)
Mateusz Śmietana, Warsaw Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 11199:
Seventh European Workshop on Optical Fibre Sensors
Kyriacos Kalli; Sinead O. O'Keeffe; Gilberto Brambilla, Editor(s)

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