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Screen-Printed Sensors for Colorimetric Detection of Hydrogen Sulfide in Ambient Air

1
Fraunhofer Institute for Physical Measurement Techniques IPM, 79110 Freiburg, Germany
2
Department of Microsystems Engineering—IMTEK, University of Freiburg, 79110 Freiburg, Germany
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(5), 1182; https://doi.org/10.3390/s19051182
Received: 31 January 2019 / Revised: 22 February 2019 / Accepted: 5 March 2019 / Published: 8 March 2019
(This article belongs to the Special Issue Eurosensors 2018 Selected Papers)
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Abstract

A fast and sensitive method to monitor hydrogen sulfide (H2S) in ambient air based on a visible color change of a printed disposable sensor has been developed. As gas-sensitive material, an immobilized copper(II) complex of the azo dye 1-(2-pyridylazo)-2-naphtol (H-PAN) was synthesized and prepared in an ethyl cellulose matrix for screen printing. If H2S is present in ambient air, the gas sensitive layer changes its color from purple to yellow. A pre-primed polyethylene (PE) foil and a coated offset paper served as the printing substrate. The colorimetric response to the target gas was measured by UV/Vis spectroscopy in reflection at H2S concentrations between 1 to 20 ppm. Possible cross-sensitivities of the printed sensors towards methane (CH4), formaldehyde (CH2O), carbon monoxide (CO), ammonia (NH3), and nitrogen dioxide (NO2), as well as the long-term stability was investigated. Furthermore, reflection measurements of the Cu-PAN complex on an amorphous silica powder under gas admission served as preliminary test for the subsequent paste development. View Full-Text
Keywords: colorimetric paper sensor; hydrogen sulfide detection; Cu-PAN complex; screen-printing; UV/Vis spectroscopy; ambient air colorimetric paper sensor; hydrogen sulfide detection; Cu-PAN complex; screen-printing; UV/Vis spectroscopy; ambient air
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Engel, L.; Tarantik, K.R.; Pannek, C.; Wöllenstein, J. Screen-Printed Sensors for Colorimetric Detection of Hydrogen Sulfide in Ambient Air. Sensors 2019, 19, 1182.

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