UHF lumped element model of a fully-inkjet-printed single-wall-carbon-nanotube-based inter-digitated electrodes breath sensor

In this effort, the authors present the first lumped element model for a fully-inkjet-printed single-wall-carbon-nanotube-based (SWCNT) inter-digitated electrode (IDE) breath sensor, in the 500-MHz to 2-GHZ frequency range. Sensible models, one intrinsic to the inkjet-printed SWCNT film, and an extrinsic (for the IDEs) were first assumed and superimposed. The models were then verified through the use of an optimization process which achieved close fitting (less than -30dB difference) with the measured detection and detection-less S-parameters of the breath sensor, while only its intrinsic parameters showing significant detection sensitivity. The suggested model offers a stepping stone for the integration of nanomaterial-based IDE sensors for low cost fully-inkjet-printed UHF sensor implementations of the Internet of Things.