Effects of template and precursor chemistry on structure and properties of mesoporous TiO2 thin films.
Mesoporous TiO2 thin films were synthesized by sol-gel processing using an aqueous-based, inexpensive, and environmentally friendly precursor and cationic surfactants as templates under mild reaction conditions. The films were prepared by spin-coating on glass substrates followed by calcination to remove the surfactant. N2 sorption, X-ray diffraction, and transmission electron microscopy were used to characterize the porosity, pore size, and pore structure before and after calcination. Films were found to have wormlike pore structures after calcination and surface areas on the order of 200 m2/g. These results show that the mesostructure and porosity of the thin films can be controlled by the surfactant template chemistry such as surfactant/Ti ratio, pH, and rate of solvent evaporation.
Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, USA.
X Shari
XS
Li
Glen E
GE
Fryxell
Jerome C
JC
Birnbaum
Chongmin
C
Wang
D000327:Adsorption; D055598:Chemical Phenomena; D002621:Chemistry; D005782:Gels / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D008567:Membranes, Artificial; D046529:Microscopy, Electron, Transmission / Q000379:methods; D009584:Nitrogen / Q000737:chemistry; D010316:Particle Size; D016062:Porosity; D012680:Sensitivity and Specificity; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D005782:Gels; D008567:Membranes, Artificial; D013501:Surface-Active Agents; C009495:titanium dioxide; D014025:Titanium; D009584:Nitrogen