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Chemosensors 2016, 4(2), 8; doi:10.3390/chemosensors4020008

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.
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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)
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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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