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Multiplexing the sensors is key to achieve high sensitivity and selectivity of an artificial nose. (a) Dickinson et al. [159] proposed a fiber optic bead sensor array. (b) Brenet et al. [161] constructed a microarray and used surface plasmon resonance imaging (SPRi) for VOC sensing in the gas phase. (c) Kybert et al. [63] integrated numerous graphene field effect transistors (FETs) on a small chip.
