Characteristics of Titanium Dioxide Synthesized by the Carbon Dioxide Microwave Plasma at Atmospheric Pressure
Carbon dioxide (CO2) gas has extensively been studied to be utilized as an environmental friendly material of the future. In this regard, we report on the synthesis of carbon-doped titanium dioxide (C-doped TiO2) nanoparticles by CO2 microwave plasma with gas-phase titanium tetrachloride (TiCl4) at atmospheric pressure. The system for synthesizing the C-doped TiO2 nanoparticles contains mainly a microwave generator system, a microwave plasma torch, a gas feeder for injecting gas-phase TiCl4. For an efficient synthesis, a mixture of TiCl4 bubbled with CO2 was introduced into the central position of the microwave plasma produced by CO2 as a swirl gas. The synthesis of C-doped TiO2 nanoparticles was carried out in accordance with the reaction: CO2 + TiCl4 → carbon-doped TiO2 + 2Cl2. Here, we have identified through this experiment that the CO2 microwave plasma endows the doping of carbon species into the TiO2 lattice, as indicated by a significant red shift in the absorption edge in the relebant UV-visible absorption spectra.
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Document Type: Research Article
Publication date: April 1, 2016
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