Potential of Impedance Spectroscopy towards Quantified Analysis of Gas Sensors: A Tutorial

Transduction of the gas sensor devices through Impedance Spectroscopy (IS) provides non-conventional route to derive quantified model of equivalent circuit and to address resonant frequency tuned selectivity aspect. The quantification of the equivalent circuit elements possibly enhances the scientific understandings of sensing performance in computational scheme. Simultaneously, resonant frequency tuned selectivity approach is another possible outcome of the IS, applied to the gas sensors. These methodologies, prove the potentiality of the IS highlighting the theoretical as well as practical aspects of gas sensor devices. The present scope focuses on the step-by-step approach of flexible adoption in measuring techniques of the IS from its liquid phase measurement to gas phase one. The comparative analysis of quantitative equivalent circuit in different gas ambient is fruitful to presume the experimental details as well as the underlying physical phenomena. The input signal frequency also paved the path for the resonant frequency tuned selectivity improvement for the gas sensor devices. Importance of the IS, as transduction technique, is also discussed with physical, theoretical and computational insights. This review also dealt with corresponding constraints of IS in gas sensors by thorough inspection of different bottlenecks reported in literatures. The present review also has a focus to instigate further research to mitigate such constraints and to further improve the potentiality of the IS in gas sensor field.