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Abstract
Sensors operating in multiple domains, such as optical and electrochemical, offer properties making biosensing more effective than those working in a single domain. To combine such domains in one sensing device, materials offering a certain set of properties are required. Fluorine-doped tin oxide (FTO) thin film is discussed in this work as functional optically for guiding lossy modes and simultaneously electrochemically, i.e. as a conductive material for a working electrode. Performance of the FTO-based optical fiber lossy-mode resonance (LMR) sensor in both optical and electrochemical domains is analyzed. Additionally, to enhance applicability of the sensor, its probe-like reflection configuration has been developed. It is found that FTO may be considered as a promising alternative for other thin conductive oxides (TCO), such as indium tin oxide (ITO) that has been often applied up to date in various dual-domain sensing concepts. In the optical domain, the sensitivity of the FTO-LMR sensor to external refractive index (RI) has reached 450 nm/RIU in the RI range of 1.33–1.40 RIU. In the electrochemical domain, in turn, the response for FTO electrode in 1,1′-Ferrocenedimethanol solution has been reached with RedOx current low peak-to-peak separation. In contrast to the ITO-LMR sensors, the FTO-LMR counterparts exhibit a significant influence of applied potential on LMR wavelength shift in a wide potential range. It is shown using streptavidin as a target biomaterial that label-free biosensing applications of the FTO-LMR approach are possible. The dual-domain functionality allows for cross-verification between readouts received in both the domains, as well as enhancement of optical sensitivity when cross-domain interactions are applied.
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Authors (10)
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Dariusz Burnat
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Petr Sezemsky
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Katarzyna Lechowicz
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Marcin Koba
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Marta Janczuk-Richter
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Vitezslav Stranak
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Joanna Niedziółka-Jönsson
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Mateusz Śmietana
Cite as
Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.snb.2022.132145
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
SENSORS AND ACTUATORS B-CHEMICAL
no. 367,
ISSN: 0925-4005 - Language:
- English
- Publication year:
- 2022
- Bibliographic description:
- Burnat D., Sezemsky P., Lechowicz K., Koba M., Janczuk-Richter M., Janik M., Stranak V., Niedziółka-Jönsson J., Bogdanowicz R., Śmietana M.: Functional fluorine-doped tin oxide coating for opto-electrochemical label-free biosensors// SENSORS AND ACTUATORS B-CHEMICAL -Vol. 367, (2022), s.132145-
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.snb.2022.132145
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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