Non-Enzymatic Ascorbic Acid Sensor Simultaneous Applied to Potentiometric and Amperometric Measurement

Abstract

This study used copper oxide nanoparticles (CuO NPs) modified molybdenum trioxide (MoO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ) film prepare non-enzymatic ascorbic acid (AA) sensor. We used polyethylene terephthalate (PET) as the substrate for the AA sensor. The properties of the device were examined using potentiometric and amperometric measurement approaches. Screen printing and radio frequency (R.F.) sputtering were used to fabricate the device and the advantages and disadvantages of the potentiometric and amperometric approaches were measured and recorded. The average sensitivity, coefficient of determination, effects of interference, limits of detection (LOD), reproducibility and response time of the device were compared to existing known devices. The copper oxide nanoparticles (CuO NPs) used for the study were produced in-lab by the green synthesis method, and were then used to modify the MoO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> film by simple instillation. The properties of the CuO NPs/MoO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> /Silver/PET sensor showed that both potentiometric and amperometric measurement methods were viable for AA solutions in a concentration range 7.81 μM-2 mM. This study demonstrates that even without enzymatic assistance, AA sensors can show excellent selectivity and sensing performance.