Metal Oxide Nanoparticles
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Metal oxides include materials with a wide range of properties and applications. When the size of these materials is brought down to the nanometer regime, a number of size-dependent properties arise primarily as a result of surface chemistry. This field of nanoscience is facilitated by the fact that many of the systems of interest have been extensively studied in the bulk form and therefore provide ready comparisons with the nanoparticulate systems.
The insulating oxides are made up of the metals from the left and right sides of the periodic table. Typical examples of insulating oxides include MgO, CaO, Al2O3, and SiO2. The oxides of the metals in the middle of the periodic table (Sc to Zn) make up the semiconducting or metallic oxides. Typical examples include ZnO, TiO2, NiO, Fe2O3, and Cr2O3. Additionally, the transition metal oxides, which include the oxides of Ru, Mo, W, Pt, V, and so forth, are of particular interest for applications in catalysis, sensor materials, and other potential applications.