Preparation of three dimensional Cu2O/Au/GO hybrid electrodes and its application as a non-enzymatic glucose sensor

Herein, the novel three dimensional hybrid electrodes based on Au and graphene oxide co-modified Cu2O were successfully synthesized via a seed-medium process combined with electrodeposition. Moreover, in order to clarify the effect of different modified materials on the structure and glucose sensing ability, single graphene oxide and single Au modified Cu2O electrodes were fabricated. The fine Au nanoparticles were decorated on the surface of Cu2O nanocubes, while the graphene oxide formed the interconnected clothing-like core-shell structure. Thanks to the glucose catalytic ability of Au, both Au modified Cu2O and Au and graphene oxide co modified Cu2O electrodes showed double sensing regions, which leads to a significant improvement in the linear ranges and can be applied to more complex detection environments. The Au modified Cu2O electrode exhibited the highest sensitivity (up to 3041 mu AmM(-1)cm(-2)) and relatively wide linear range (11.65 mM), while the Au and graphene oxide co-modified Cu2O electrode shared the widest linear range (up to 16.65 mM) and acceptable sensitivity (2886 mu AmM(-1)cm(-2)). Moreover, the excellent selectivity, stability together with the excellent sensing ability in real serum and beverages make the obtained electrodes have the potential for practical applications.

Automated summary

Novel three dimensional hybrid electrodes based on Au and graphene oxide co-modified Cu2O were successfully synthesized via a seed-medium process combined with electrodeposition. The Au modified Cu2O electrode exhibited the highest sensitivity and relatively wide linear range, while the Au and graphene oxide co-modified Cu2O electrode shared the widest linear range and acceptable sensitivity.