Microwave-assisted Hydrothermal Deposition of Reduced Graphene Oxide on Ti Foil
Current Topics and Emerging Issues in Materials Sciences Vol. 1,
20 April 2023
,
Page 19-47
https://doi.org/10.9734/bpi/cteims/v1/18639D
Abstract
Ti-TiO2-rGO composite structures synthesized in microwave-assisted hydrothermal conditions were successfully obtained by in-situ deposition of reduced graphene oxide (rGO) on Ti foil. The aggregation of graphene layers is prevented by microwave-assisted hydrothermal treatment due to the fast and uniform heating mode, which represents the main advantage of using this method for synthesis of the composite structures. Within this research, TiO2 crystallin layer was growth in a controlled atmosphere consisting of a mixed flow gas (95%Ar and 5 %O2) at 500°C by thermal oxidation of Ti foil in the presence of 0.5 M hydrofluoric acid. Investigations such as X-ray diffraction, UV-VIS analysis, and SEM morphology were used to analyze the structural, optical, and morphological characteristics of the composites. The I-V measurements of the Ti-TiO2-rGO composite structures were performed in forward bias with an applied voltage between -3 V and +3 V, and a step rate of 10 mV/s. Furthermore, the electrochemical behavior was studied using cyclic voltammetry in a 1M KNO3 supporting electrolyte with 4 mM K3Fe(CN)6 to ascertain the electroactive surface area and apparent diffusion coefficient. The charge transfer resistance was investigated by electrochemical impedance spectroscopy in 0.1 M Na2SO4 supporting electrolyte and frequency range between 100 kHz and 0.1 Hz, to confirm the rGO role on the electrode surface. In conclusion, this study provided new insights into the development of high-performance and cost-effective Ti-TiO2-rGO structures both for the development of electrochemical electrodes and gas sensors.
- Reduced graphene-oxide
- TiO2
- microwave reaction
- n-situ deposition