We propose a new method to synthesize organic-inorganic hybrid nanoparticles using supercritical hydrothermal synthesis. By introducing organic species (aminoacids, carboxylic acids, amines, alcohols, aldehydes etc.) during supercritical hydrothermal synthesis, nanoparticles whose surface was modified with organic molecules were synthesized. This is probably due to the homogeneous phase formation in supercritical conditions. Particle size was in the range from several to 20 nm. By selecting a proper surface modifier, particles could be dispersed perfectly in organic solvent or in aqueous solutions. This implies a variety of applications of the nanoparticels including nanohybrid polymers, nano-ink, and nanopaints.
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