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Enzyme supporting layer is a lamination of enzyme layer and mediator layer. (a) ChrPrs dipped into the solutions containing AOD and HRP or Ferro; (b) ChrPrs left to dry in a refrigerator at 4 °C for 12 h, respectively; (c) Modified ChrPr enzyme electrodes (ChrSPCEs) placed onto the screen-printed electrodes; (d) Measurement setup of ethanol gaseous analysis by the ChrSPCEs.
