High‐performance non‐enzymatic glucose sensor based on Co <sub>3</sub> O <sub>4</sub> /rGO nanohybrid
Lingyun Xiong, Youjoong Kim, Woncheol Seo, Hankyu Lee, Woochul Yang, Wanfeng Xie
Abstract
Abstract There has been substantial interest in designing and fabricating electrochemical non‐enzyme sensors for glucose detection with a focus on the nanocomposites used between metal oxide and the two‐dimensional material. In this work, Co 3 O 4 /reduced graphene oxide (rGO) nanocomposite was obtained and used as a modified electrochemical electrode for the detection of trace glucose. According to the results, the electrocatalytic performances of Co 3 O 4 nanoparticles for the oxidation of glucose were substantially enhanced with the addition of a small amount of rGO. Specifically, the Co 3 O 4 /rGO modified electrode exhibited a sensitivity of 82 μA·mmol −1 ·cm −2 , a detection limit of 50 μmol·L −1 (signal noise ratio ( S / N ) = 3), and a fast response time of about 1 s under optimal conditions. The enhanced performances of the Co 3 O 4 /rGO modified electrode are attributable to the high absorption oxygen (O Ads ) and synergistic effect between Co 3 O 4 and rGO. The results indicate that Co 3 O 4 /rGO nanocomposite is a promising candidate for being used as the active material in real‐world electrochemical biosensors.