Surface Oxidation States in Si/SiO_2 Nanostructures Prepared from Si/SiO_2 Mixtures

摘要

Heterogeneous catalysts,adsorbents,and solid-state electronic sensors are derived from either single or multiple metal oxides sometimes combined with high surface area oxides such as silica or alumina.The surface oxidation state of these solids at least in part determines their performance.Current materials preparation techniques require postsynthesis treatment(s)to achieve the desired surface oxidation state(s).We have reported the preparation of nonporous nanoparticles,which appear spherical and nearly monodisperse(Figure 1),from the reaction/interaction of Si and SiO_2 AT 1300 deg C under argon or nitrogen atmospheres.