| 초록 |
This study reports the synthesis of carbon(C)-doped titanium dioxide (TiO2) nanoparticles in atmospheric carbon dioxide (CO2) microwave plasma using gas-phase titanium tetrachloride (TiCl4). This system mainly consists of 2.45-GHz microwave plasma torch and gas feeders for injecting TiO2 forming nanoparticles. After TiCl4 gas is introduced into CO2 microwave plasma, TiO2 nanoparticles are synthesized immediately by high-temperature and high density of CO2 plasma flame. C-doped TiO2 nanoparticles via the reaction of CO2 + TiCl4 → C-doped TiO2 + 2Cl2 were identified by results of FE-SEM, XRD, XPS and a UV-visible spectrometer. The absorption edge of C-doped TiO2 nanoparticle significantly shifted from high energy wavelength to lower in UV-visible spectrum due to a band gap narrowing. |
