A novel sensitive nonenzymatic glucose sensor based on perovskite LaNi_(0.5)Ti_(0.5)O_3-modified carbon paste electrode

摘要

A novel sensitive nonenzymatic glucose sensor was reported based on perovskite LaNio.5Tio.5O3 (LNT) modified carbon paste electrode (CPE). The surface characterization of the modified electrode and the bare CPE was examined by scanning electron microscopy (SEM). The high electrochemical activity of LNT to electrocatalytic oxidation of glucose in alkaline medium was characterized by cyclic voltammetry and amperometry, and the experimental conditions such as the amount of LNT, the concentration of NaOH and the applied potential were investigated in detail. The glucose sensor was applied to the quantification of glucose with a high sensitivity of 1630.57 μAmM~(-1) cm~(-2) and a low limit of detection of 0.07 μM.The novel glucose sensor also exhibited good reproducibility, long-term stability, as well as high selectivity with no interference from common interfering substances such as ascorbic acid, dopamine and uric acid.