An auditory implant comprises an array of micro-electrodes including at least two stimulation micro-electrodes each comprising a core of conducting material； insulating material (108) surrounding the core； and a layer (112) of metal or metal oxide nano-structures deposited on tips of the micro-electrodes at a first end for interfacing with a target site for auditory stimulation； and an integrated circuit to control a pattern of stimulation current driven through the array of micro-electrodes.
