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ANATASE TYPE TiO2 NANORODS AND ITS PREPARATION METHOD

  • US 20090291044A1
  • Filed: 05/26/2009
  • Published: 11/26/2009
  • Est. Priority Date: 05/26/2008
  • Status: Active Grant
First Claim
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1. A process for preparing titania nanorods for dye sensitized or quantum-dot nanoparticle sensitized solar cells, comprising:

  • (a) slowly adding dropwise chilled distilled water to titanium tetrachloride (TiCl4) to prepare solution of titanium oxychloride (TiOCl2);

    (b) adding basic solution thereto to maintain pH of the titanium oxychloride solution within a range from 3.5 to 4, thereby providing a suspension of titanium oxyhydroxide (TiO(OH)2) precipitate;

    (c) adding basic solution thereto to adjust the suspension of titanium oxyhydroxide precipitate to be weakly basic, and heating and stirring the mixture at 80 to 100°

    C.;

    (d) isolating and collecting titanium oxyhydroxide from the heated and stirred suspension of titanium oxyhydroxide precipitate, and washing it with weakly basic aqueous solution; and

    (e) adding distilled water and 20 to 500 folds of hydrogen peroxide (H2O2) on the basis of 1 mole of Ti4+ in titanium oxyhydroxide to the washed titanium oxyhydroxide, and heat-treating the mixture at a temperature of 90 to 100°

    C. for 1 to 7 days to prepare titania nanorods having the mean length of 100 nm to 300 nm.

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