In situ growth of the CoO nanoneedle array on a 3D nickel foam toward a high-performance glucose sensor

A glucose sensor with high sensitivity and low detection limit is vital for human beings' health. Herein, a CoO nanoneedle array with an unique electronic structure was successfully constructed by a hydrothermal and subsequent high-temperature calcination process. The optimized CoO-400 nanoneedles exhibit a larger electrochemical active surface area, beneficial electronic structure, favorable lattice distortion, and abundant active sites, which effectively promote electrochemical properties toward glucose sensing. The glucose sensor constructed by CoO-400 nanoneedles shows a high sensitivity of 84.23 mA cm(-2) mM(-1) and low detection limit of 4.4 x 10(-7) M, superior to the results from most previous reports. Moreover, outstanding anti-interference ability, superior long-term stability, good repeatability, and satisfactory reproducibility in glucose detection for CoO-400 nanoneedles are also demonstrated.

Automated summary

A glucose sensor with high sensitivity and low detection limit was successfully constructed using CoO-400 nanoneedles, which exhibit a larger electrochemical active surface area, beneficial electronic structure, favorable lattice distortion, and abundant active sites. The glucose sensor shows superior performance in terms of sensitivity, detection limit, anti-interference ability, stability, repeatability, and reproducibility.