Citation:
SUN Li, ZOU Hai-Feng, WANG Chengb. Synthesis and Characterization of Surface-modified Nanocrystalline Anatase Titania with Different Morphologies[J]. Chinese Journal of Applied Chemistry,
;2007, 24(11): 1259-1262.
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Surface-modified nanocrystalline anatase titania with different morphologies were prepared via a non-hydrolytic route through a simplified supercritical CO2 method, which deploys direct sealing of dry ice into autoclave instead of using supercritical CO2. The decomposition of Ti(OC4H9)4 precursor was fulfilled at 190℃ with the presence of oleyamine as surfactant in toluene and CO2. The pressure inside the autoclave could reach 17 MPa due to the evaporation of dry ice at elevated temperature. The morphologies and structure of the products were characterized by XRD, TEM and FT-IR. The experimental results show that the products obtained using surfactant are dispersible within organic solvents such as toluene and hexane. Nanorods of titania with dimension size of 2×8 nm could be obtained when the volume ration of tolune:oleyamine:Ti(OC4H9)4 was set as 2:0.4:0.5. The growth direction of such nanorods might be along with the C axis of anatase titania. A possible growth mechanism and function of dry ice in this system were proposed based on experimental observations.
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