The implementation of sensor platforms providing high sensitivity of detection is a crucial step for the design of the new analytical device generation for biosensor developments. Designing platform with active/non-actives region at nanoscale has shown already a drastic increase of sensitivity. Besides, the electrochemical sensitivity can be as well enhanced by using nano-electrode arrays that increase mass transport rate. Polypyrrole (PPy) is a good candidate to fulfil these requirements. Its preferential material for bio-analytical electrochemistry based sensor thanks to its good environmental stability, excellent biocompatibility and higher conductivity, together with the possibility of being functionalised with biological relevant functional groups. In this work surfaces with PPy nano pillars were fabricated by electrochemically growing PPy in a nano-template of gold nano-seeds in a silicon oxide (SiO_x) matrix. Atomic force Microscopy and Scanning Kelvin Microscopy demonstrated that PPy grown only inside the conductive gold seeds, creating nano pillars of conductive material surrounded by an insulating material. The nano-structured surfaces were studied by Cyclic Voltammetry using hexacyanoferrate and the typical sigmoidal shape voltammogram of nanoelectrodes was obtained . Square Wave Voltammetry was tested in the surface and a well defined peak was obtained which indicates that the nanoarray is a promising surface for use in trace analytical analysis.

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