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- Title
Disposable, Paper-Based, Inkjet-Printed Humidity and H<sub>2</sub>S Gas Sensor for Passive Sensing Applications.
- Authors
Quddious, Abdul; Shuai Yang; Khan, Munawar M.; Tahir, Farooq A.; Shamim, Atif; Salama, Khaled N.; Cheema, Hammad M.
- Abstract
An inkjet-printed, fully passive sensor capable of either humidity or gas sensing is presented herein. The sensor is composed of an interdigitated electrode, a customized printable gas sensitive ink and a specialized dipole antenna for wireless sensing. The interdigitated electrode printed on a paper substrate provides the base conductivity that varies during the sensing process. Aided by the porous nature of the substrate, a change in relative humidity from 18% to 88% decreases the electrode resistance from a few Mega-ohms to the kilo-ohm range. For gas sensing, an additional copper acetate-based customized ink is printed on top of the electrode, which, upon reaction with hydrogen sulphide gas (H2S) changes, both the optical and the electrical properties of the electrode. A fast response time of 3 min is achieved at room temperature for a H2S concentration of 10 ppm at a relative humidity (RH) of 45%. The passive wireless sensing is enabled through an antenna in which the inner loop takes care of conductivity changes in the 4-5 GHz band, whereas the outer-dipole arm is used for chipless identification in the 2-3 GHz band.
- Subjects
INK-jet printers; GAS detectors; WIRELESS sensor networks; HYDROGEN sulfide; HUMIDITY
- Publication
Sensors (14248220), 2016, Vol 16, Issue 12, p2073
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s16122073