An array of silicon microcantilevers was used to create an electronic nose, with each cantilever coated with different sensor layers such as metals, self-assembled monolayers, or polymers. Analyte molecules physisorb or chemisorb on the microcantilevers, causing deflection and/or a change in resonance frequency. An optical method was used to measure the deflection of the microcantilever. However, reading a large number of microcantilevers requires multiplexing, which involves switching on and off eight light sources at different time intervals. The swelling process's kinetics were related to the analyte's vapour pressure and solubility characteristics in the polymers, whereas effects related to heat transfer or mass change could be used for analyte detection. For more information, please see this PPT.

Dency Varghese

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