Abstract
Carbon monoxide (CO) is a toxic and extremely dangerous gas commonly produced from partial combustion of fossil fuels from automobiles, industries and power plants, etc. Prolonged inhalation of CO with higher concentration (150–200 ppm) causes convulsions, respiratory arrest and even may lead to death. Therefore, a low-cost highly sensitive CO sensor with low detection limit is needed for environmental and biomedical applications. A resistive CO gas sensor was fabricated using zinc oxide nanorods (ZnO NRs). The sensor sensitivity, response, and detection limit have been enhanced by depositing reduced graphene oxide (rGO). The maximum sensitivity was obtained with 25 µl rGO loading at ∼190 °C operating temperature. The sensor demonstrated high selectivity towards the interfering gases like nitric oxide, acetone, alcohol and ammonia. rGO loaded ZnO NRs based CO gas sensor exhibited sensitivity 0.9 ppm-1 with lower limit of detection ∼14.3 ppb.
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