A two-step sol-gel method for synthesis of nanoporous TiO2
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| Title | A two-step sol-gel method for synthesis of nanoporous TiO2 |
| Publication Type | Journal Article |
| Year of Publication | 2004 |
| Authors | Kartini, I., Meredith Paul, Zhao X. S., da Costa J. C. D., and Lu G. Q. |
| Journal | Journal Of Nanoscience And Nanotechnology |
| Volume | 4 |
| Issue | 3 |
| Pagination | 270–274 |
| Abstract | This article reports a study of the effects of synthesis parameters on the preparation and formation of mesoporous titania nanopowders by employing a two-step sol-gel method. These materials displayed crystalline domains characteristic of anatase. The first step of the process involved the hydrolysis of titanium isopropoxide in a basic aqueous solution mediated by neutral surfactant. The solid product obtained from step 1 was then treated in an acidified ethanol solution containing the same titanium precursor to thicken the pore walls. Low pH and higher loading of the Ti precursor in step 2 produced better mesoporosity and crystallinity of titanium dioxide polymorphs. The resultant powder exhibited a high surface area (73.8 m(2)/g) and large pore volume (0.17 cm(3)/g) with uniform mesopores. These materials are envisaged to be used as precursors for mesoporous titania films as a wide band gap semiconductor in dye-sensitized nanocrystalline TiO2 solar cells. |
| DOI | 10.1166/jnn.2004.037 |