Surface-Modified Tantalum Oxide Nanoparticles, Preparation Method Thereof, and Contrast Medium for X-Ray Computed Tomography and Highly Dielectric Thin Film Using Same
The present invention relates to a surface-modified tantalum oxide nanoparticle, a method for preparation thereof, a contrast agent (medium) for X-ray computed tomography, and a highly dielectric (high-K) film using the same. In particular, the present invention is directed to a surface-modified tantalum oxide nanoparticle, a method for preparing surface-modified tantalum oxide nanoparticles, comprising: (i) adding an aqueous phase to an organic solvent which contains a surfactant, to prepare a water-in-oil microemulsion (ii) introducing a tantalum precursor to said microemulsion (iii) adding a surface-modifier having an organic silane group or phosphine group to a solution obtained at the step (ii) (iv) removing said organic solvent from a product obtained at the step (iii) and (v) separating surface-modified tantalum oxide nanoparticles from a mixture obtained at the step (iv), a contrast agent for X-ray computed tomography, and a highly dielectric (thin) film using the same.
