Polypyrrole-Functionalized MWCNT Heterojunctions for Gas Detection

Abstract

The current study is critical in examining the performance of a new nanocomposite sensor capable of detecting NO₂ and H₂S using a combination of PPy, NiO, and f-MWCNT. The f-MWCNT addition to the polymer matrix increases film roughness and the surface-to-volume ratio of the film, hence increasing adsorption of gas molecules on nanotube surfaces. The resistance change of the nanocomposite after exposure to H2S shows a very high sensitivity to the detection of gas, and the f-MWCNT has enhanced the sensing ability of the PPy sensor. This combination of PPy and f-MWCNT also exhibits a fast response time for both NO₂ and H2S gases. The paper analyses the sensitivity, response, and recovery time of the sensor, along with operating temperatures from 50, 100, 150, and 200°C, giving a survey of the different operating conditions that the sensor may operate efficiently. The uniqueness of this paper is in the specific nanocomposite structure based on the unique properties of PPy, NiO, and f-MWCNT to enhance the detection of gas. The innovative approach to the design of sensors guarantees an efficient and highly responsive solution to monitor toxic gases.