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Nanocrystalline diamond microelectrode on fused silica optical fibers for electrochemical and optical sensing
Abstract
Fabrication process of thin boron-doped nanocrystalline diamond (B-NCD) microelectrode on fused silica single mode optical fiber has been investigated. The B-NCD films were deposited on the fibers using Microwave Plasma Assisted Chemical Vapor Deposition (MW PA CVD) at glass substrate temperature of 475 ºC. We have obtained homogenous, continuous and polycrystalline surface morphology with the mean grain size in the range of 100-250 nm and high sp3 content in B-NCD films. The films deposited on glass reference samples exhibit high refractive index (n≈2.05 at λ=550 nm) and low extinction coefficient. Furthermore, cyclic voltammograms (CV) were recorded to determine the electrochemical window and reaction reversibility at the B-NCD fibre-based electrode. Cyclic voltammetry (CV) measurements in aqueous media consisting of 5mM K3[Fe(CN)6] in 0.1M Na2SO4 demonstrated a width of the electrochemical window up to 2.5 V and relatively fast kinetics expressed by a redox peak splitting below 500 mV. Moreover, thanks to high-n B-NCD overlay, the coated fibers can be also used for enhancing sensitivity of long-period gratings (LPGs) induced in the fibers. The LPG is capable for measuring variations in refractive index of surrounding liquid by tracing shift in resonance appearing in transmitted spectrum. Possible combined CV and LPG-based measurements are discussed in this work. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Authors (7)
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Katatrzyna SiuzdaK dr inż.
- Polska Akademia Nauk Instytut Maszyn Przepływowych
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Mateusz Śmietana
- Politechnika Warszawska Katedra Mikroelektroniki i Optoelektroniki
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Keywords
Details
- Category:
- Conference activity
- Type:
- materiały konferencyjne indeksowane w Web of Science
- Title of issue:
- 5th Asia-Pacific Optical Sensors Conference (APOS) strony 1 - 2
- Language:
- English
- Publication year:
- 2015
- Bibliographic description:
- Bogdanowicz R., Sobaszek M., Ficek M., Gnyba M., Ryl J., Siuzdak K., Śmietana M..: Nanocrystalline diamond microelectrode on fused silica optical fibers for electrochemical and optical sensing, W: 5th Asia-Pacific Optical Sensors Conference (APOS), 2015, SPIE,.
- DOI:
- Digital Object Identifier (open in new tab) 10.1117/12.2185154
- Verified by:
- Gdańsk University of Technology
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