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Disposable, Paper-Based, Inkjet-Printed Humidity and H(2)S Gas Sensor for Passive Sensing Applications

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 pape...

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Detalles Bibliográficos
Autores principales: Quddious, Abdul, Yang, Shuai, Khan, Munawar M., Tahir, Farooq A., Shamim, Atif, Salama, Khaled N., Cheema, Hammad M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5191054/
https://www.ncbi.nlm.nih.gov/pubmed/27929450
http://dx.doi.org/10.3390/s16122073
Descripción
Sumario: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 (H(2)S) 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 H(2)S 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.