Graphene oxide based ethylene gas sensor for e-nose application

Multilayer graphene oxide (GO) is prepared by well-known Hummer's method from pure graphite powder and characterized structurally by XRD, FESEM and Raman spectroscopy analysis. A conductive type GO based pellet sensor has been fabricated and response of the sensor in presence of ethylene gas when emitted by different fruits has been studied in a closed chamber at room temperature. The results show that, the conductivity of the sensor changes depending upon the amount of ethylene gas emitted from the fruit kept in the sensing chamber and thus our sensor can clearly identify different fruits. Moreover, for a particular fruit, it can differentiate an unripe, a ripe and an over ripe fruit.