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

: Engel, Laura; Tarantik, Karina; Pannek, Carolin; Wöllenstein, Jürgen

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Sensors. Online journal 19 (2019), No.5, Art. 1182, 9 pp.
ISSN: 1424-8220
ISSN: 1424-8239
ISSN: 1424-3210
Eurosensors Conference <32, 2018, Graz>
Journal Article, Conference Paper, Electronic Publication
Fraunhofer IPM ()
Colorimetric Paper Sensor; hydrogen sulfide detection; Cu-PAN complex; screen printing; UV/Vis spectroscopy; ambient air

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.