This work, we have demonstrated a low-cost and effective chemiresistive CO2Â sensor based on a composite of functionalized carbon nanotubes (f-CNTs) with polyethyleneimine (PEI). The resulting sensor shows excellent selectivity and sensitivity, which can respond to the CO2Â concentration in a wide range of 300 - 5000Â ppm. The effects of ink dilution and humidity from the environment on the sen...
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