Synthesis of Au or Ag/Cu2O/ aluminum doped zinc oxide nanorods hybrid electrode for high sensitive non-enzymatic glucose sensor: Mechanism investigation of formation and surface plasmon resonance

The proposal of the research mainly employs the surface plasmon resonance of gold (Au) and silver (Ag) nanoparticles (NPs) to stabilized induction current of hybrid cuprous oxide (Cu 2 O)/aluminum doped zinc oxide nano-rods (AZO NRs) for non-enzymatic glucose sensor. This research investigation concerns the mechanism of formation and surface plasmon resonance. There were mainly three synthesis processes for the hybrid electrode. The first involved the hydrothermal growth of AZO NRs, and the seed layer of AZO was sputtered with different thickness from 35 to 105 nm. The second concerned the deposition of Cu 2 O on AZO NRs by the method of electrochemical deposition, and the Cu 2 O films were prepared with different pH value from 3 to 10. The third was concerned with Au and Ag NPs, and they were formed with the hydrothermal method and the seed reduction method, respectively. These NPs were dripped uniformly on the surface of Cu 2 O/AZO NRs through Nafion dispersants. Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and chronoamperometry (CA) were used to verify these formation performances for the Au or Ag NPs/Cu 2 O/AZO NRs hybrid electrodes. The results showed that the linear range changed from 70.5 to 37.5 and 54.5 mg/dL, and linear regression coefficients (R 2 ) also increased from 0.982 to 0.9965 and 0.997, respectively for Au and Ag NPs modified Cu 2 O/AZO NRs electrodes. • Au or Ag NPs/Cu 2 O/AZO NRs hybrid electrodes for glucose sensor. • Au or Ag NPs induces the surface plasmon resonance. • AZO NRs fabricated by hydrothermal method. • Cu 2 O on AZO NRs by the method of electrochemical deposition.