Abstract
The use of inexpensive gas sensors is a real need for many applications requiring the use of disposable sensors. This work deals with the realization and characterization of a low cost CO2 sensor realized by rapid prototyping techniques. In particular, the sensor consists of a set of InterDigiTed electrodes, over which a double sensing layer made of PEDOT/PSS (CLEVIOS™ PHCV4, by H.C.Starck) and a solution of pristine graphene powder has been deposited. A silver nano-particle solution is used for inkjet printing the electrodes onto the PET (PolyEthylene Terephthalate) substrate, through a commercial inkjet printer. The sensing strategy is based on the variation of the electrical conductance of graphene due to gas molecules adsorption. The device responsivity observed in two different operating conditions (50 °C and 60 °C), is 4.0 µΩ/Ω/ppm and 4.7 µΩ/Ω/ppm. The corresponding values of the resolution are 400 ppm and 420 ppm. Main advantages of the developed sensor consist in the cost-effective fabrication techniques and the device flexibility, which are strategic for applications requiring disposable and shapeable devices to be installed into irregular surfaces.
Highlights
Technologies for gas sensors are rapidly developing due to the increasing demand for devices with characteristics compliant to a wide set of applications involving the gas monitoring challenge [1,2,3,4].In particular, carbon dioxide (CO2 ) measurement is a real need for several application contexts including environmental and agriculture monitoring
Carbon dioxide (CO2 ) measurement is a real need for several application contexts including environmental and agriculture monitoring
The main subject addressed by this paper concerns the realization of a low cost CO2 sensor by rapid prototyping techniques and the use of conductive inks, polymers and graphene
Summary
Technologies for gas sensors are rapidly developing due to the increasing demand for devices with characteristics compliant to a wide set of applications involving the gas monitoring challenge [1,2,3,4].In particular, carbon dioxide (CO2 ) measurement is a real need for several application contexts including environmental and agriculture monitoring. The monitoring of CO2 levels is strategic for air quality assessment in indoor environments, such as schools, offices and public buildings, especially to control ventilation conditions. After few minutes of a regular population, show high level of carbon dioxide, especially if these areas are subject to restricted ventilation. The main subject addressed by this paper concerns the realization of a low cost CO2 sensor by rapid prototyping techniques and the use of conductive inks, polymers and graphene. The latter are interesting for their functional properties as well as for their sensing properties
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