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Design of Highly Selective Gas Sensors via Physicochemical Modification of Oxide Nanowires: Overview

Towards Enhanced Gas Sensor Performance with Fluoropolymer Membranes

Laboratory for Gas Sensors, Department of Microsystems Engineering-IMTEK, University of Freiburg, Georges-Köhler-Allee 102, 79110 Freiburg, Germany
ams Sensor Solutions Germany GmbH, Gerhard-Kindler-Str. 8, 72770 Reutlingen, Germany
Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstr. 8, 79110 Freiburg, Germany
Author to whom correspondence should be addressed.
Academic Editors: Eduard Llobet and Stella Vallejos
Sensors 2016, 16(10), 1605;
Received: 12 July 2016 / Revised: 12 September 2016 / Accepted: 19 September 2016 / Published: 28 September 2016
(This article belongs to the Special Issue Gas Nanosensors)
In this paper we report on how to increase the selectivity of gas sensors by using fluoropolymer membranes. The mass transport of polar and non-polar gases through a polymer membrane matrix was studied by systematic selection of polymers with different degrees of fluorination, as well as polymers whose monomers have ether groups (-O-) in addition to fluorine groups (-F). For the study, a set of application-relevant gases including H2, CO, CO2, NO2, methane, ethanol, acetone, and acetaldehyde as well as various concentrations of relative humidity were used. These gases have different functional groups and polarities, yet have a similar kinetic diameter and are therefore typically difficult to separate. The concentrations of the gases were chosen according to international indicative limit values (TWA, STEL). To measure the concentration in the feed and permeate, we used tin-dioxide-based metal oxide gas sensors with palladium catalyst (SnO2:Pd), catalytic sensors (also SnO2:Pd-based) and thermal conductivity sensors. This allows a close examination of the interdependence of diffusion and physicochemical operating principle of the sensor. Our goal is to increase the selectivity of gas sensors by using inexpensive fluoropolymer membranes. The measurements showed that through membranes with low polarity, preferably non-polar gases are transported. Furthermore, the degree of crystallization influences the permeability and selectivity of a polymer membrane. Basically the polar polymers showed a higher permeability to water vapor and polar substances than non-polar polymer membranes. View Full-Text
Keywords: gas sensor; fluoropolymer; membrane; selectivity gas sensor; fluoropolymer; membrane; selectivity
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MDPI and ACS Style

Graunke, T.; Schmitt, K.; Raible, S.; Wöllenstein, J. Towards Enhanced Gas Sensor Performance with Fluoropolymer Membranes. Sensors 2016, 16, 1605.

AMA Style

Graunke T, Schmitt K, Raible S, Wöllenstein J. Towards Enhanced Gas Sensor Performance with Fluoropolymer Membranes. Sensors. 2016; 16(10):1605.

Chicago/Turabian Style

Graunke, Thorsten, Katrin Schmitt, Stefan Raible, and Jürgen Wöllenstein. 2016. "Towards Enhanced Gas Sensor Performance with Fluoropolymer Membranes" Sensors 16, no. 10: 1605.

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