A dispersion of carbon nanoparticles is prepared by monodispersing carbon
nanoparticles in water droplets of a reverse micelle solution in which
the water droplets are coated with amphiphilic molecules and dispersed in
an organic solvent. In a method of preparing the dispersion of carbon
nanoparticles, carbon nanoparticles and a monodispersion function
material, e.g., ammonia, for imparting a polarity to surfaces of the
carbon nanoparticles are added to the reverse micelle solution. The
solution is then stirred, so that the carbon nanoparticles whose surfaces
have the polarity are monodispersed in the water droplets of the reverse
micelle solution. Further, a metal alkoxide is added to the solution and
then stirring them, so that the surfaces of the carbon nanoparticles are
coated with oxide of the metal.