Abstract
This chapter throws light on developments of various gas sensors using conventional solvents and room temperature ionic liquids (ILs). First, potentiometric and amperometric gas sensors are discussed. The work of American biochemist Leland Clark was discussed due to his contribution toward electrochemical gas sensors that are based on Clark oxygen electrode. Second, the uses of different conventional solvents and ILs in gas sensing applications are described. Third, electrochemical gas sensors, including methodologies supporting electrochemical gas sensors, electrochemical oxygen sensors, electrochemical ammonia sensors, electrochemical nitrogen oxides (NOx) sensors, volatile organic compound sensors, and other electrochemical gas sensors, are discussed in detail and systematically. Subsequently, optical gas sensors, including optical oxygen sensors, optical carbon dioxide sensors, optical ammonia sensors, optical volatile organic compound gas sensors, are elaborated thoroughly. Thereafter, piezoelectric gas sensors, including quartz-crystal microbalance gas sensor, surface acoustic wave–based gas sensors, and piezoresistive (viscosity) based gas sensors, are presented. Afterwards, semiconductor metal oxide gas sensors, carbon-IL composite gas sensors, gated IL gas sensors are also discussed meticulously. Furthermore, recent developments and some new approaches of gas sensing applications were also incorporated in this chapter.
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