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Multifrequency interrogation of nanostructured gas sensor arrays : a tool for analyzing response kinetics

Metal-oxide gas sensors are inexpensive options for the detection of toxic species but their relatively poor selectivity constrains implementation in practical applications. Recently, our group developed a multifrequency interrogation scheme for optimizing the temperature modulation of metal oxide gas sensor arrays, which can systematically identify optimal temperature modulating frequencies. In this paper, unique insight is gained into the effects of temperature modulation on the physicochemical mechanisms encountered in gas sensing. The findings help understand the improved selectivity that temperature modulation affords, and, most importantly, they form the basis for nanoengineering of gas-sensitive films to better exploit their practical usage.