Article ID Journal Published Year Pages File Type
5420823 Solid State Nuclear Magnetic Resonance 2009 8 Pages PDF
Abstract
Carbon-doped TiO2 have received attention recently because of their potential for environmental photocatalysis and solar hydrogen conversion applications. Three different carbon-doped TiO2 nanoparticle materials were synthesized via sol-gel and hydrothermal procedures, and analyzed by 13C solid-state nuclear magnetic resonance (SSNMR) and other methods to characterize the environment of the doping species. UV/vis spectra and powder X-ray diffraction (XRD) patterns showed that the synthesized materials absorbed visible light and their crystal structures corresponded to anatase. 13C SSNMR analyses of TiO2−xCx displayed signals corresponding to carbonate-type or sp2-type carbon species. Variable contact CP-MAS and dipolar dephasing analyses gave evidence for the presence and proximity of H atoms near these carbonate species. Electron paramagnetic resonance (EPR) spectroscopy showed that the thermally oxidized TiO2−xCx displayed a complex mixture of point defects, electron and hole trapping centers, all attributable to the incorporation of carbon, while the XPS data ruled out the presence of carbide species.
Related Topics
Physical Sciences and Engineering Chemistry Physical and Theoretical Chemistry
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