Fabrication of Metal-oxide Nanoparticles by the Liquid Phase Deposition Method in the Heterogeneous System

Abstract

For the development of the preparation method of size-controlled nanoparticles, we applied the liquid phase deposition (LPD) method to the reverse micelle (RM) reaction contained TritonX-100 and 1-hexanol. We prepared two kinds of metal oxide nanoparticle; TiO₂ and SnO₂. The average sizes of nanoparticles were 5.9 nm and 3.0 nm for TiO₂ and SnO₂, respectively. The size distribution was narrow, and crystallization of the particles was promoted by the nano-scale reaction field. The bandgap was calculated from UV-Vis spectra. The bandgap energy of SnO₂ nanoparticles showed a larger value at 4.6 eV, whereas that of TiO₂ nanoparticles showed a constant value at 3.2 eV. The quantum effect causes the variation of the bandgap, however, the effect depends on the kinds of the metal oxide.