Long-term stabled non-enzymatic glucose sensor for continuously monitoring system applications

In this paper, two different non-enzymatic glucose sensors with Ag/AgCl and Pt reference electrodes (RE) are fabricated, characterized, and compared for continuously monitoring system applications. The fabricated non-enzymatic sensors are comprised of three electrodes, nanoporous platinum working electrode (WE), platinum count electrode (CE), and Ag/AgCl or Pt REs, respectively. An optimum applied potential for the detection of glucose was determined as 0.4 V by using glucose cyclic voltammetry graph. Although the sensor with Pt RE has larger response current in glucose solution than the other, it has too much noise and no repeatability. On the other hand, the sensor with Ag/AgCl RE has good repeatability and improved selectivity over interfering species such as ascorbic acid (AA) and acetaminophen (AP). In addition, it has excellent long-term stability. These results indicate that fabricated non-enzymatic glucose sensor with Ag/AgCl RE is strongly applicable for continuously monitoring systems.