| 摘要 |
A method for synthesizing TiO<SUB>2</SUB>, metal-doped TiO<SUB>2</SUB>, and metal-coated TiO<SUB>2 </SUB>particles of spherical form factor and needle type of which the average particle size is below 150 nm. The method of the invention is to synthesize Ti(OH)<SUB>4</SUB>, metal-doped Ti(OH)4 or metal-coated Ti(OH)4, and react the same by applying a pressure above the saturated vapor pressure at a temperature above 100° C. The pressure is achieved by means of the pressure of the vapor generated during the reaction inside of a closed reactor, by pressure applied from the outside, or a mixture of both. Gases to increase the pressure from outside are preferably inert gases such as Ar and N<SUB>2 </SUB>but are not limited to inert gases.
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