A two-step sol-gel method for synthesis of nanoporous TiO2

TitleA two-step sol-gel method for synthesis of nanoporous TiO2
Publication TypeJournal Article
Year of Publication2004
AuthorsKartini, I., Meredith Paul, Zhao X. S., da Costa J. C. D., and Lu G. Q.
JournalJournal Of Nanoscience And Nanotechnology
AbstractThis 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.