“…better selectivity, multicomponent analysis, and analyte recognition. Some electronic noses use fluorescent polymers, fiber-optic cables [29], arrays of different polymeric thin film sensors [30], gold nanoclusters deposited on interdigital microelectrode arrays [31], surface acoustic wave [32,33], quartz crystal microbalance gas sensors, and micro-electromechanical systems [34]. In future these systems will replace some of the larger and more expensive detection devices.…”