YANG Qiumei, ZHUANG Yi, CAO Yang

(College of Materials Science and Engineering , Hainan University, Haikou 570228, Hainan, China)

Abstract: A composite made of 3D graphene-wrapped copper cobaltite hollow spheres (3DGW/CuCo₂O₄) was synthesized through ahydrothermal method, etching, and subsequent calcination with Cu₂O/graphene oxide (Cu₂O/GO) as a template. The phase, morphology,valence and electrochemical properties of the composite were investigated. The results show that CuCo₂O₄ hollow spheres with a diameterof about 500 nm are wrapped by the 3D graphene as a carrier. The unique 3D graphene structure enables the composite to have charge-transfer resistance and superior electrochemical properties. When the 3DGW/CuCo₂O₄ composite was used for non-enzymatic glucose sensordetection, it reached the sensitivity of 2265 μA·mM⁻¹·cm⁻² within the glucose concentration range of 0-0.7 μM, and 1337.7 μA·mM⁻¹·cm⁻² in the glucose concentration range of 0.7-2.3 μM.

Key words: CuCo₂O₄; graphene; glucose; sensors