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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) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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