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Chemosensors 2016, 4(2), 8;

A Double Layer Sensing Electrode “BaTi(1-X)RhxO3/Al-Doped TiO2” for NO2 Detection above 600 °C

German Aerospace Center, Institute of Materials Research, Linder Hoehe, 51147 Cologne, Germany
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Russell Binions
Received: 8 December 2015 / Revised: 8 April 2016 / Accepted: 15 April 2016 / Published: 29 April 2016
(This article belongs to the Special Issue Chemical Vapor Sensing)
Full-Text   |   PDF [15232 KB, uploaded 29 April 2016]   |  


NO2 emission is mostly related to combustion processes, where gas temperatures exceed far beyond 500 °C. The detection of NO2 in combustion and exhaust gases at elevated temperatures requires sensors with high NO2 selectivity. The thermodynamic equilibrium for NO2/NO ≥ 500 °C lies on the NO side. High temperature stability of TiO2 makes it a promising material for elevated temperature towards CO, H2, and NO2. The doping of TiO2 with Al3+ (Al:TiO2) increases the sensitivity and selectivity of sensors to NO2 and results in a relatively low cross-sensitivity towards CO. The results indicate that NO2 exposure results in a resistance decrease of the sensors with the single Al:TiO2 layers at 600 °C, with a resistance increase at 800 °C. This alteration in the sensor response in the temperature range of 600 °C and 800 °C may be due to the mentioned thermodynamic equilibrium changes between NO and NO2. This work investigates the NO2-sensing behavior of duplex layers consisting of Al:TiO2 and BaTi(1-x)RhxO3 catalysts in the temperature range of 600 °C and 900 °C. Al:TiO2 layers were deposited by reactive magnetron sputtering on interdigitated sensor platforms, while a catalytic layer, which was synthesized by wet chemistry in the form of BaTi(1-x)RhxO3 powders, were screen-printed as thick layers on the Al:TiO2-layers. The use of Rh-incorporated BaTiO3 perovskite (BaTi(1-x)RhxO3) as a catalytic filter stabilizes the sensor response of Al-doped TiO2 layers yielding more reliable sensor signal throughout the temperature range. View Full-Text
Keywords: TiO2; Al-doping; NO2 sensor; BaTi(1-x)RhxO3 catalytic filter; sputtering; screen printing TiO2; Al-doping; NO2 sensor; BaTi(1-x)RhxO3 catalytic filter; sputtering; screen printing

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Saruhan, B.; Haidry, A.A.; Yüce, A.; Ciftyürek, E.; Mondragón Rodríguez, G.C. A Double Layer Sensing Electrode “BaTi(1-X)RhxO3/Al-Doped TiO2” for NO2 Detection above 600 °C. Chemosensors 2016, 4, 8.

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