Decreasing the surface area of working electrode to micro/nano scale offers several advantages on the electroanalytical performance of the sensor such as enhanced signal-to-noise ratio, increased sensitivity, and small sample volume . The double layer around the micro/nano electrode has a lower capacitance and smaller time constant that allow the signal to be measured more rapidly and with less destruction to the sensor . As the electrode dimensions are smaller than the diffusion layer thickness, the mass transport increases and therefore its sensitivity also increases . Smaller size electrodes can be used to manufacture high-density multiplexed devices which may open up the way for commercialisation . For example, has reported an array consisted of 32 individually addressable gold microelectrodes and their use for