Facile synthesize surfactants and binder-free nanoflake Co(OH)2 on CuCo2S4 nanowire for highly sensitive and selective non-enzymatic glucose sensor

Abstract

The cross-linked Co(OH)2/CuCo2S4/Ni composite material has been successfully prepared by a simple method. CuCo2S4 nanoneedles are grown on NF by hydrothermal method, and then Co(OH)2 nanolayer was constructed by constant potential deposition. This nanostructure provides a good conductive network for effective charge transfer, which can detect direct and non-enzymatic reactions of glucose oxidation at low potential. In this paper, the microstructure and electrochemical properties of the prepared Co(OH)2/CuCo2S4 composites were characterized and tested. In the electrochemical sensing process, Co(OH)2/CuCo2S4 nanomaterials show high sensitivity, low detection limit, excellent selectivity, and linear response, reaching wide linear range of 1 μM-6.957 mM, high sensitivity of 2714.7 μA mM−1 cm−2 and a low detection limit of 0.26 μM. In addition, the sensor shows fast response time (within 2.5s), excellent selectivity and stability. CuCo2S4 nanowire array increases active surface area for the catalytic reaction and act as a stable conductive scaffold of Co(OH)2 to promote electron transfer. This low-cost and straightforward detection method offers a new strategy for non-enzymatic glucose detection.