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      https://www.ias.ac.in/article/fulltext/boms/039/06/1569-1579

    • Keywords

       

      Carbon-modified titanium dioxide; synthesis; nanostructure; spectroscopy; optical and photocatalytic properties.

    • Abstract

       

      A morphology-controlled facile synthesis of titanium-glycolate precursors with subsequent annealing in He and air atmospheres has been exploited for the production of nanostructured composite globules, whiskers and plates of C-modified titanium dioxide. Characterisation tests proved the as-obtained globule composites to exclusively exhibit high-specific surface area (up to 150–170 m$^2$ g$^{−1}$), thus being useful for photocatalytic applications inthe visible-light region. The combination of the electron paramagnetic resonance, X-ray photoelectron spectroscopy, absorption spectroscopy and transmission electron microscopy revealed the presence of three kinds of carbon in the globules: a small bandgap (with measured width of 0.8 eV) amorphous carbon surrounding the anatase nanocrystallites,C-containing radicals including carbonates on the surface of TiO$_2$ and interstitial carbon in the oxygen position of the TiO$_2$ lattice. It was found that the maximum visible-light photocatalytic activity of the globules is determinedby the optimal surface concentration of amorphous carbon of about 0.002 wt.% m$^{−2}$. Under these conditions, the highest synergic photosensitising effect on TiO$_2$ nanocrystallites of all three kinds of carbon is expected.

    • Author Affiliations

       

      V N KRASIL’NIKOV1 E V SHALAEVA1 I V BAKLANOVA1 M A MELKOZEROVA1 M V KUZNETSOV1 E V ZABOLOTSKAYA1 O I GYRDASOVA1 L YU BULDAKOVA1 A M MURZAKAEV2

      1. Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg 620990, Russian Federation
      2. Institute of Electrophysics of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg 620016, Russian Federation
    • Dates

       
  • Bulletin of Materials Science | News

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