Gold is one of the most common electrode material employed in electrochemical sensor development due to its good biocompatibility, high conductivity and stability . Easy and effective chemisorption of thiol modified biomolecules such as nucleic acid onto gold surfaces make them very attractive for several sensing applications. , an example of this method has been reported by . In this study, gold electrodes, which were fabricated on a waste newspaper, were used for immobilisation of thiol-modified probe DNA. The surface changes were investigated via electrochemical impedance spectroscopy (EIS)