A Novel Gas-phase Hydrogen Peroxide Sensor Basing on a Combined Physical/chemical Transduction Mechanism
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0951-E12-03
A Novel Gas-Phase Hydrogen Peroxide Sensor Basing on a Combined Physical/Chemical Transduction Mechanism Niko Naether1, Ruediger Emmerich2, Joerg Berger2, Peter Friedrich2, Hartmut Henkel3, Andreas Schneider3, and Michael J. Schoening1,4 1 Laboratory for Chemical Sensors and Biosensors, Aachen University of Applied Sciences, Ginsterweg 1, Juelich, 52428, Germany 2 SIG Combibloc Systems GmbH, Linnich, 52442, Germany 3 Von Hoerner & Sulger GmbH, Schwetzingen, 68723, Germany 4 Institute of Bio and Nano Systems, Research Centre Juelich, Juelich, 52425, Germany
ABSTRACT In this work, different set-ups as well as different transducer materials have been investigated in order to develop a hydrogen peroxide (H2O2) sensor for the gas phase. The sensor is based on a combined physical/chemical transduction mechanism and should be able to detect high H2O2 concentrations up to 10 Vol.%. Different sensor arrangements are presented that are based on a “three sensor” cell and a diffusion cell. As transducer materials manganese oxide and copper alloys have been investigated. For the reference part of the sensor set-up, Teflon and enamel have been tested as passivating material. INTRODUCTION Chemical- and bio-sensors are well established in detecting a multitude of chemical and/or biological parameters in liquids and gases. Nonetheless, especially with regard to practical and industrial applications, there is still a lack of reliable, long-term stable sensor devices. Industrial fields of food technology and biomedicine, e.g. the sterilisation of packages (food, beverages, drugs), requires fast, reliable and inexpensive aseptic methods. The sterilisation by hydrogen peroxide (H2O2) vapour offers one distinct advantage over other chemical methods, like gaseous formaldehyde, glutaraldehyde and ethylene oxide, namely its harmless decomposition products of H2O and O2. On the other hand, in industrial applications, H2O2 is mixed with ambient air and heated up to more than 200 °C, yielding a gaseous H2O2 concentration varying between 1 and 10 Vol.%. Generally, there exist different H2O2 detection principles such as potentiometric biosensors with receptor layers (e.g., enzyme), semiconductor gas sensors (e.g., DrägerSensor) or highsophisticated infrared methods. However, all these methods cannot be adapted for industrial processes due to the necessary high temperature stability (>200 °C), the fast response time (
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