Non-enzymatic Hydrogen Peroxide and Glucose Sensing Using TiO₂/CuO Hierarchical Heterojunction Nanostructure

The development of highly sensitive, long-lasting and cost-effective dual hydrogen peroxide (H 2 O[Formula: see text]/glucose sensors is crucial for various industries, particularly in medical, clinical diagnostics, pharmaceuticals, environmental monitoring and food business. In our study titanium dioxide/copper oxide (TiO 2 /CuO) hierarchical nanostructure electrodes have been grown using hydrothermal process and their nonenzymatic H 2 O 2 sensing and glucose sensing properties have been demonstrated using cyclic voltammetry and amperometry measurements. The surface morphology of TiO 2 nanorods (TiO 2 NRs) and TiO 2 /CuO hierarchical nanostructure was investigated using a scanning electron microscope (SEM). The TiO 2 /CuO hierarchical nanostructure electrodes demonstrated sensitivity of 20.09 [Formula: see text]A mM[Formula: see text] cm[Formula: see text] toward H 2 O 2 , in the concentration range 0.25–18.25 mM. The TiO 2 /CuO hierarchical nanostructure electrodes demonstrated a sensitivity of 1.5 mA mM[Formula: see text] cm[Formula: see text] towards glucose, in the concentration range 0.05–5 mM. Furthermore, artificial neural networks (ANN) were used to model the observed experimental results.