Selectivity Enhancement by Using Double-Layer MOX-Based Gas Sensors Prepared by Flame Spray Pyrolysis (FSP).
Here we present a novel concept for the selective recognition of different target gases with a multilayer semiconducting metal oxide (SMOX)-based sensor device. Direct current (DC) electrical resistance measurements were performed during exposure to CO and ethanol as single gases and mixtures of highly porous metal oxide double- and single-layer sensors obtained by flame spray pyrolysis. The results show that the calculated resistance ratios of the single- and double-layer sensors are a good indicator for the presence of specific gases in the atmosphere, and can constitute some building blocks for the development of chemical logic devices. Due to the inherent lack of selectivity of SMOX-based gas sensors, such devices could be especially relevant for domestic applications.
Institute of Physical Chemistry, University of Tübingen, Auf der Morgenstelle 15, Tübingen 72076, Germany. Julia.Rebholz@ipc.uni-tuebingen.de.
Julia
J
Rebholz
Institute of Physical Chemistry, University of Tübingen, Auf der Morgenstelle 15, Tübingen 72076, Germany. katharina.grossmann@ipc.uni-tuebingen.de.
Katharina
K
Grossmann
IWT Foundation Institute of Materials Science, University of Bremen, Badgasteiner Str. 3, Bremen 28359, Germany. dpham@iwt.uni-bremen.de.
David
D
Pham
IWT Foundation Institute of Materials Science, University of Bremen, Badgasteiner Str. 3, Bremen 28359, Germany. spokhrel@iwt.uni-bremen.de.
Suman
S
Pokhrel
IWT Foundation Institute of Materials Science, University of Bremen, Badgasteiner Str. 3, Bremen 28359, Germany. lmaedler@iwt.uni-bremen.de.
Lutz
L
Mädler
Institute of Physical Chemistry, University of Tübingen, Auf der Morgenstelle 15, Tübingen 72076, Germany. upw@ipc.uni-tuebingen.de.
Udo
U
Weimar
Institute of Physical Chemistry, University of Tübingen, Auf der Morgenstelle 15, Tübingen 72076, Germany. nb@ipc.uni-tuebingen.de.
Nicolae
N
Barsan
double-layer sensor; flame spray pyrolysis; gas sensor; logic device; selectivity