Abstract
In this paper, carbon aerogel (CA)-polyaniline (PANI) composites were prepared and first applied in the study of H2S gas sensing. Here, 1 and 3 wt% of as-obtained CA powder were blended with PANI to produce composites, which are denoted by PANI-CA-1 and PANI-CA-3, respectively. For the H2S gas-sensing studies, the interdigitated electrode (IDE) was spin-coated by performing PANI and PANI-CA composite dispersion. The H2S gas-sensing properties were studied in terms of the sensor’s sensitivity, selectivity and repeatability. IDE coated with PANI-CA composites, as compared with pristine PANI, achieved higher sensor sensitivity, higher selectivity and good repeatability. Moreover, composites that contain higher loading of CA (e.g., 3 wt%) perform better than composites with lower loading of CA. At 1 ppm, PANI-CA-3 displayed increased sensitivity of 452% at relative humidity of 60% with a fast average response time of 1 s compared to PANI.
Highlights
Hazardous gases may exist in an indoor or outdoor environment
In this study, we report the preparation of PANI-carbon aerogel (CA) composites and first applied it in H2S sensing on the interdigitated electrode (IDE) of ITO glass
We successfully prepared a PANI-CA composite by using the physical mixing method
Summary
Hazardous gases may exist in an indoor or outdoor environment. analysis and monitoring of toxic gases such as H2 S, SO2 and NOx are required. Hydrogen sulphide gas (H2 S) is a colourless, flammable, poisonous and corrosive gas It is usually produced from the bacterial breakdown of organic matter by the absence of oxygen gas and the decomposing wastes of humans and animals. A growing body of research is focusing on the fabrication of robust, portable and low-cost gas sensors. These sensors play an important role in the medical field, environmental monitoring, industrial safety control and security [4,5]. Among the spectrum of heterogeneous fillers, carbon-based materials are typically used to extend the functionality, overcome the poor processability and improve the conductivity of PANI. The physical and chemical properties of the composites were analysed, and the gas-sensing characteristics were studied in terms of sensitivity, selectivity and repeatability
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