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Direct monitoring of organic vapours with amperometric enzyme gas sensors

Title data

Hämmerle, Martin ; Achmann, Sabine ; Moos, Ralf:
Direct monitoring of organic vapours with amperometric enzyme gas sensors.
Event: The 10th World Congress on Biosensors , 14.-16.05.2008 , Shanghai, China.
(Conference item: Conference , Other Presentation type)

Abstract in another language

Gas sensing finds applications in various fields such as environmental control, hygiene, safety, automobile exhaust gas control or indoor air quality. Sensors are e.g. based on semiconductors or ionic conductors, include catalytic pellistor sensors, and employ optical, thermal, electrical or electrochemical detection techniques. Enzyme based gas sensors can broaden the sensor portfolio and open new applications due to the superior selectivity based on the substrate specificity of the enzyme. As the enzyme needs an aqueous environment, the interface between the gaseous analyte and the aqueous sensor electrolyte is of special importance. In this work gas diffusion electrodes are employed that are well known for amperometric gas sensors, but have been hardly applied to gas sensors incorporating enzymes. The gas diffusion electrodes are fabricated by depositing carbon or metal (Au or Pt) onto a porous, hydrophobic PTFE-membrane by filtration or e-beam evaporation, respectively. The amperometric gas sensor consists of a 3-electrode configuration with the gas diffusion electrode as the working electrode at the interface between the gaseous analyte phase and the aqueous electrolyte of the sensor. Close to the gas diffusion electrode, whose conducting layer faces the electrolyte, the enzyme is immobilised. Sensors for various analytes are presented, e.g. formaldehyde, phenol or ethanol. For the monitoring of formaldehyde an NAD-dependent formaldehyde dehydrogenase is used, for phenol the enzyme tyrosinase, and for ethanol the enzyme alcohol oxidase. Thus, different amperometric detection schemes are exemplarily demonstrated ranging from NAD-recycling, to direct detection of the enzymatic reaction product and in the case of the oxidase to hydrogen peroxide measurement. The sensors are characterized according to sensitivity, detection limit, response time, selectivity, and stability. In summary, the presented sensor configuration allows the selective, continuous, online monitoring of organic vapours without prior accumulation or sampling of the analyte.

Further data

Item Type: Conference item (Other)
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 03 Jun 2015 06:35
Last Modified: 06 Apr 2016 09:29