“…Currently, several low-cost transition metal oxides such as Fe 2 O 3 , [26][27] Mn x O x , [6,28] MoO 2 , [29] CdO, [30] NiO, [1][2][31][32] ZnO, [33] and CuO [25,[34][35][36][37] have been studied for use in non-enzymatic glucose sensors. Among all of these metal oxides, CuO has been widely explored as a catalytic material for different applications including semiconductors, supercapacitors, batteries, solar energy conversion, gas sensing devices, catalysis, biosensors, and transistors because it is a p-type semiconductor with a band gap of 1.2 eV, and it exhibits a low overpotential for electron exchange, excellent electrocatalytic activity, high active surface area, good chemical stability, and biocompatibility.…”