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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:07 |
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Conference: Bucharest University Faculty of Physics 2017 Meeting
Section: Solid State Physics and Materials Science
Title:
New directions in developing of planar potentiometric ceramic multilayered oxygen sensor type
Authors:
Rovena PASCU(1), George EPURESCU (1)
Affiliation:
1) National Institute for Laser, Plasma and Radiation, Magurele, Bucharest, Romania
E-mail
rovenav@gmail.com, gepurescu@yahoo.com
Keywords:
Planar ceramic multilayer, potentiometric oxygen sensor, lambda sensor, solid state planar electrodes
Abstract:
A new generation of a low cost intermediate temperature (400-800 degrees C) compact planar potentiometric mini oxygen lambda sensor, for real - time in- situ control the concentration of residual oxygen within the exhaust gases produced by internal combustion engines will be developed like an integrated ceramic thin films deposited by Pulsed Laser Deposition technique (ArF excimer laser, wavelength 193 nm). These electro-ceramic devices are based on a high-k solid electrolyte 8YSZ (Yttria Stabilized Zirconia) with oxygen ionic conductivity and solid state electrodes with a differential catalytic activity between the sensing La0.5Sr0.5Co0.8Fe0.2O3 (LSCF) and reference electrodes (40%Ni-8YSZ). To improve time of operation, an interface of approximately 10nm thickness of Gd0.1Ce0.9O 1.95 thin film will be deposed between LSCF and 8YSZ to block the interdiffusion. Methods of structural, optical and electrical characterizations will influenced the development of new performant lambda oxygen sensor with stabiliized measurements into a defined field of lambda variation avoiding frequent errors specific in classical configuration. The new sensor will have a fast response time by placing close to the exhaust zone and with a good withstand at high temperatures (400-800 degrees C) for a long time; sensor output must be insensitive to the moisture content.
References:
[1] R. Pascu, G. Epurescu, A. Moldovan, R. Birjega, C. Luculescu, D. Colceag, M. Dinescu, Optical and structural characterization of YSZ thin films deposited by excimer laser ablation for planar potentiometric oxygen sensors applications, Romanian Reports in Physics 2016
[2] R. Pascu, G. Epurescu, S. Somacescu, N. Cioatera, S. Brajnicov, R. Birjega, C. Luculescu, B. Mitu Improved stability of LSCF thin films cathode with Gd-doped ceria interface deposited by PLD on YSZ electrolyte, ICPEPA P106, pp.22, 10th International Conference on Photoexcited Processes and Applications, Brasov, Romania, 2016
[3] Rovena Pascu, Angela Vlad, Roxana Radu, George Epurescu, Improved Stability of 40Ni-YSZ thin films reference electrode with gd-doped ceria interface deposited by PLD on ysz electrolyte for planar potentiometric oxygen sensor, EMRS Spring Meeting, 2017
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