A sensitive bow shaped ZnCo2O4/CeO2 nanocomposite derived from bimetallic organic frameworks as glucose enzyme sensors

Recently, the remarkable properties of ternary transition metal oxides with spinel structure derived from metal-organic frameworks (MOFs) have attracted researchers' attention in the field of electrochemistry. In this work, zeolitic imidazolate frameworks (Zn-ZIF-67) was grown in situ on the surface of another metal organic framework (Ce-BTC) by internal expansion growth method (IEGM), and then the bow shaped ZnCo2O4/CeO2 nanocomposite was prepared by using the resulting complex as template. When applied as enzyme-free glucose sensor, the bow shaped ZnCo2O4/CeO2 nanocomposite shows good catalytic performance of glucose oxidation, especially the sensitivity value(2161.78μA·mM-1·cm-2) is higher than most of the reported results, with a very short response time (<1 s), and a low detection limit of 0.055 μM (S/N = 3). Furthermore, the modified electrode can continue to function correctly even when exposed to a range of interference-causing compounds and can be used for extended periods of time in air. Utilizing fruit juice to test this enzyme-free glucose sensor yielded good results, raising the possibility of future applications.