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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. shu

Synthesis and Characterization of Surface-modified Nanocrystalline Anatase Titania with Different Morphologies

SUN Li ^a,b ,
ZOU Hai-Feng ^a ,
WANG Chengb ^b,,

1.
a Department of Applied Chemistry, Jilin University, Changchun;
2.
b Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: WANG Chengb,
Received Date: 10 November 2006
Available Online: 26 February 2007
Fund Project:

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.
- nano titania,
- supercritical CO₂,
- non-hydrolytic,
- morphology-controlled,
- surface-modified,
- nanorod
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