In this work we focused on the development of a membrane free electrochemical based dissolved oxygen sensor using IDEs. It was determined that the ideal sensor for detection of dissolved oxygen should contain a gold generator electrode to produce hydrogen peroxide, and a platinum collector electrode to subsequently detect the hydrogen peroxide. To facilitate this, platinum was plated onto one comb of a gold interdigitated array. This had the additional benefit of decreasing the interelectrode gap, thereby increasing the collection efficiency. The dual metal IDE was then used to calibrate dissolved oxygen in water using CV. A pre-treatment step was developed that improved the sensitivity of platinum to hydrogen peroxide by ensuring a clean, reproducible surface for each test. The developed sensor accurately detected oxygen concentrations between ~0 and 9 ppm, with a sensitivity of 1.59 nA/ppm and an LOD of 0.36 ppm. The detection of oxygen was also tested in the presence of unknown interferents, as in river water, and known interferents. It was found that the magnitude of hydrogen peroxide oxidation was generally unaffected by the presence of interferents, indicating a potential for interferent free oxygen detection without the requirement of oxygen permeable membranes.