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Sensors 2009, 9(3), 1574-1589; doi:10.3390/s90301574

Metal-Organic Frameworks for Sensing Applications in the Gas Phase

1,* , 1, 1, 2, 2 and 1
1 Functional Materials, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany 2 BASF SE, Ludwigshafen, Germany
* Author to whom correspondence should be addressed.
Received: 19 February 2009 / Revised: 4 March 2009 / Accepted: 5 March 2009 / Published: 6 March 2009
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Germany)
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Several metal-organic framework (MOF) materials were under investigated to test their applicability as sensor materials for impedimetric gas sensors. The materials were tested in a temperature range of 120 °C - 240 °C with varying concentrations of O2, CO2, C3H8, NO, H2, ethanol and methanol in the gas atmosphere and under different test gas humidity conditions. Different sensor configurations were studied in a frequency range of 1 Hz -1 MHz and time-continuous measurements were performed at 1 Hz. The materials did not show any impedance response to O2, CO2, C3H8, NO, or H2 in the gas atmospheres, although for some materials a significant impedance decrease was induced by a change of the ethanol or methanol concentration in the gas phase. Moreover, pronounced promising and reversible changes in the electric properties of a special MOF material were monitored under varying humidity, with a linear response curve at 120 °C. Further investigations were carried out with differently doped MOF materials of this class, to evaluate the influence of special dopants on the sensor effect.
Keywords: Metal-organic framework; MOF; impedance spectroscopy; humidity; gas sensor Metal-organic framework; MOF; impedance spectroscopy; humidity; gas sensor
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Achmann, S.; Hagen, G.; Kita, J.; Malkowsky, I.M.; Kiener, C.; Moos, R. Metal-Organic Frameworks for Sensing Applications in the Gas Phase. Sensors 2009, 9, 1574-1589.

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