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Potentiometric hydrocarbon gas sensing characteristics of sodium ion conducting zeolite ZSM-5

Title data

Dubbe, Andreas ; Moos, Ralf:
Potentiometric hydrocarbon gas sensing characteristics of sodium ion conducting zeolite ZSM-5.
In: Sensors and Actuators B: Chemical. Vol. 130 (14 March 2008) Issue 1 . - pp. 546-550.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2007.09.067

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationMO 1060/4-2

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The sodium ion conducting zeolite Na-ZSM-5 is used as a novel sensitive material in a potentiometric gas sensor with a Na0.85CoO2 reference electrode. At 723 K, a fast voltage response to alkane (C1–C4) partial pressure changes (1–100 kPa) in O2/CO2/N2 base gas is observed. The sensing effect is quantitatively described by a model assuming a change of the Na+ ion activity in the zeolite due to sorption of alkanes in the micropores. The sensor signal is logarithmically dependent on alkane partial pressure at high concentrations and shows a levelling-off behaviour at low partial pressures. The slopes in the logarithmic range are between 99 and 144 mV/decade. The lower detection limits are dependent on the alkane chain length and vary from 12 ppm for n-butane to 1.1% for methane, for an observed standard deviation of 3.3 mV. Cross-sensitivities to O2, H2, and CO2 have different response behaviour and are ascribed to a superimposed effect involving changes of the Na activity at the zeolite/gold interface. Response times (t90) are in the order of 5 min.

Further data

Item Type: Article in a journal
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
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: 27 Jan 2015 12:48
Last Modified: 06 Apr 2016 09:42
URI: https://eref.uni-bayreuth.de/id/eprint/5986