Researchers from College of Information Science and Engineering, Northeastern University studied and introduced various measures for effective detection of toxic gases
Several harmful and flammable gases either cause air pollution or affect human health. Therefore, various methods have been studied and introduced to effectively detect these gases. Gas sensors offers several advantages such as low cost, compact structure, long lifespan, and simple circuit. Now, a team of researchers from College of Information Science and Engineering, Northeastern University introduced four kinds of measures that address issues, which restrict the application and performance of gas nanosensors. The team also reviewed control of nanostructure, doping with two-dimensional nanomaterials, decorating with noble metal nanoparticles, and formation of heterojunction.
Gas sensing properties rely on an efficient nanostructure and morphology, which also significantly impact performance of the sensors. Although surfactant enhances the performance, additional surfactant can lead to impact of humidity on gas sensing. The nanostructure can enhance gas sensing and the effect is also finite. Therefore, the team developed additional decoration or dope and combined with an ordered structure and morphology to further improve the sensing properties and satisfy more requirements. The team found that the preparation process of 2D nanomaterials is harder compared to other methods. Moorever, the related cost is higher and the process requires longer durations compared to other methods. Preparation process of 2D nanomaterials is also prone to oxidization.
Other methods have comparatively moderate preparation condition and proven technology. Noble metal technique is increasingly preferred as it offers unique performance and plays an important role in gas sensors. Although the approach is associated to high price, this can be compensated for by excellent enhancing effect. Heterojunction offers a wide distinction of performance in different materials and the preparation method is comparatively simple and the cost is not too high. According to the researchers, the approaches can still be enhanced with further research. An ideal material used in sensing gas must be stable in gas as its performance or can be improved by various processes. The research was published in the journal MDPI Sensors March 27, 2019.
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