Self-supported porous CoOOH nanosheet arrays as a non-enzymatic glucose sensor with good reproducibility

Porous CoOOH nanosheet arrays are constructed on Ti foils by an electrochemical assistant method. The nanosheet arrays exhibit hierarchical porous structures with a specific surface area of 470 m² g^-1. The as-prepared CoOOH nanosheet arrays are used for glucose detection as a non-enzymatic sensor. The amperometric detection of glucose is carried out at 0.52 V (versus Ag/AgCl). The amperometric signals are linearly proportional to glucose concentration from 3 μM to 1.109 mM (R = 0.995), showing a low detection limit (S/N = 3) of 1.37 μM and a high sensitivity of 526.8 μA mM^-1 cm^-2. The high sensitivity towards glucose is mainly attributed to the freestanding and self-supported features of hierarchical porous CoOOH nanosheet arrays on a conducting substrate. The most attractive feature of the array electrodes is the reproducibility, which helps the relative standard deviation of the response currents to glucose from five electrodes is 3.21%.