Inkjet-Printed Chemiresistive Sensor Array with Integrated Heater

An inkjet-printing method was used to fabricate a flexible gas sensor.This fabrication method is characterized by low material consumption, a fast design-to-fabrication process, and low fabrication cost.Due to these properties, this technology is increasingly popular in the fabrication of electronic circuits and devices.Gas sensors are devices generally used to detect the presence or, in more complex solutions, to measure the concentration of various gases.The fabrication technology and materials used determine sensor properties such as sensitivity, selectivity, repeatability, and stability for applications in general or industrial environments.In this research, we present the design preparation, fabrication, and characterization of the inkjet-printed gas sensor.The structures are based on silver nanoparticle ink and dielectric ink.The structures are printed on a flexible substrate and sintered using intense pulsed light and UV light, respectively.The printed sensors consist of an interdigital electrode (IDE) structure, a dielectric separation layer, and a heater pattern.The IDE structure is printed on the dielectric layer, which separates the heating and sensing structures.As a sensing layer, polyaniline (PANI) is drop-cast onto the IDE sensor structures.The inkjet-printed sensor was characterized based on its response to humidity and a test gas.