Flexible Carbon Fiber/TiO2 Nanopillars Electrode in the Detection of Glucose Under Photoexcitation

The development and utilization of biosensors have received a great attention from the scientific commu-nity due to their wide applications in the areas of food safety, medical diagnosis, environmental monitoring and other fields. In this paper, we report the development of a novel photoelectrochemical (PEC) sensor for glucose detection using a flexible carbon fiber/TiO2 nanopillars electrode. The carbon fiber/TiO2 nanopil-lars was prepared by two step process in which the first step is to grow TiO2 seeds over carbon fiber by magnetron sputtering while the second step leads the growth of TiO2 nanopillars over flexible carbon fibers substrate. Under photoexcitation, the PEC sensor showed a significant enhancement in the sensitivity for glucose detection. The detection mechanism was based on the photoelectrochemical oxidation of glucose to gluconic acid, which generated an electrical signal that was proportional to the glucose concentration. The electrochemical examinations were performed at low glucose concentrations in the range of 1-5 mM (mmol L-1) to investigate the corresponding photocurrent. The results showed that the photocurrent increases with increasing the glucose concentration. This is of great significance for the detection of hypoglycemia, and has IP: 203 8 109 20 On: Fri, 26 May 2023 12 42:16 good application prospects in the fields of nano-detection, bologicadiagnosis and wearable devices. The Copyr gh : American Scientific Publ shers flexible carbon fiber/TiO2 PEC sensor developed Delivered in this by studyIngentais a promising approach for the development of wearable devices for continuous glucose monitoring.