0D/1D heterostructured Au@Cu2O/CuO/Cu(OH)2 with multivalent Cu(i)/Cu(ii) for efficient and bendable glucose sensing

Abstract

With the rapid development of glucose sensor devices in recent years, it is critical to obtain a highly sensitive and low-cost sensing material by a facile method. In this study, 0D/1D heterostructured Au@Cu₂O/CuO/Cu(OH)₂ with multivalent Cu(I)/Cu(II) was prepared as an efficient electrocatalyst for glucose sensing by using a simple one-pot wet chemical method. Au@Cu₂O/CuO/Cu(OH)₂ exhibited a sensitivity of 1024.6 μA mM⁻¹ cm⁻² and a detection limit of 0.26 μM toward glucose sensing, which was 1.57 times higher than that of pure Au@Cu₂O NPs and 123.2 times higher than that of pure Au/Cu(OH)₂. The excellent performance of Au@Cu₂O/CuO/Cu(OH)₂ can be attributed to the synergistic effect of excellent charge transport brought by the Cu(OH)₂ nanowire and the rapid mass transfer capability resulting from the multivalent Cu-based oxides during the glucose sensing process. In addition, the obtained Au@Cu₂O/CuO/Cu(OH)₂ exhibited excellent stability and bending stability toward glucose sensing, revealing its great potential for practical applications in the field of wearable sensors.