In this project, a composite material of polyethyleneimine (PEI) and carbon black (CB) was prepared for CO2detection at room temperature. The function of PEI is to absorb and desorb CO2 reversibly, and the role of CB is to not only provide good electrical conductivity to a detectable range for an embedded system, but also tune the viscosity of the material so that it can be printable. This new sensor has advantages over the existing PEI-based sensing materials as its processing is much simpler, which requires less time and energy. Sensors were fabricated by a screen-printing method, and a systematic investigation of sensors has been conducted in terms of gas concentration, selectivity, sensitivity, and environmental conditions. Moreover, a comparison study of CO2 sensors made of functionalized carbon nanotubes has been performed, which could demonstrate the functions of various carbon materials in PEI-based CO2 sensors. A p-n type conversion was found in the PEI-carbon composites. We hope this study could be helpful in explaining the aging of PEI derived CO2 sensors, providing insights for the future gas sensor design.

Printable polyethyleneimine/carbon black composites for CO2 sensors

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