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Synthesis of Tellurium Dioxide Nanoparticles by Spray Pyrolysis

Tellurite glasses (amorphous TeO2 based materials) have two useful optical properties, a high refractive index and high optical nonlinearity, that make them attractive for a range of applications. Unlike other metal oxide nanoparticles that are prepared in large quantities by vapor-phase processes, TeO2 nanoparticles have not been prepared by such methods. Here, we describe the vapor-phase synthesis of TeO2 nanoparticles from an aqueous solution of telluric acid, Te(OH)6, that is dispersed into fine droplets by an atomizer. These droplets are carried by nitrogen through a furnace, where they evaporate and decompose, resulting in nucleation of TeO2 nanoparticles. The resulting nanoparticles were characterized by TEM, XPS, FTIR, and XRD. Particle size distributions measured online using a scanning mobility particle spectrometer demonstrated that a furnace temperature above 700 °C was required for full evaporation of the precursor droplets. Thermogravimetric analysis shows that the Te(OH)6 converts to TeO2 w...