Low-cost synthesis of titanium dioxide nanotubes/reduced graphene oxide heterostructure for pH sensor applications

In this work, we deposit Graphene Oxide (GO) films on Titanium Dioxide nanotubes (TiO2NTs); electrochemical characterization of this system shows that this structure has potential applications as a pH sensor. TiO2NTs were obtained by electrochemical anodization technique, the GO was fabricated by modified Hummer's method, and deposited by dip coating technique, at room temperature. The thermally treated TiO2NTs/GO structure shows a reduction of the GO deposited film. The samples were characterized by Raman spectroscopy, X-ray Photoelectron Spectroscopy, and Scanning Electron Microscopy. Depending on the GO oxidation time and thermal treatment, we observe a uniform reduced GO film on the TiO2NTs. A pH electrode characterization shows a linear response of the TiO2NTs/GO of 57 mV/pH with non-hysteresis effect.

Automated summary

In this study, graphene oxide (GO) films were deposited on the surface of titanium dioxide nanotubes (TiO2NTs), and electrochemical characterization revealed their potential application as pH sensors. TiO2NTs were obtained through electrochemical anodization technique, while GO was fabricated by a modified Hummer's method and deposited using dip coating technique at room temperature. The thermally treated TiO2NTs/GO structure exhibited a reduction of the GO deposited film. The samples were analyzed using Raman spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. Depending on the GO oxidation time and thermal treatment, a uniform reduced GO film was observed on the TiO2NTs. A pH electrode characterization demonstrated a linear response of the TiO2NTs/GO with a non-hysteresis effect of 57 mV/pH.