Synthesis of high surface area ZnO powder by continuous precipitation |
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| Authors: | İsmail Boz Stefan Kaluza Mehtap Şafak Boroğlu Martin Muhler |
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| Affiliation: | 1. McKetta Department of Chemical Engineering, University of Texas at Austin, 1 University Station, C0400 Austin, USA;2. Department of Chemistry, University of Texas at Austin, 1 University Station, C0400 Austin, USA;3. Texas Materials Institute and Center for Nano- and Molecular Science, University of Texas at Austin, 1 University Station, C0400 Austin, USA;4. Center for Electrochemistry, University of Texas at Austin, 1 University Station, C0400 Austin, USA |
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| Abstract: | Synthesis of high surface area ZnO powder was achieved by continuous precipitation using zinc ions and urea at low temperature of 90 °C. The powder precipitated resulted in high-purity single-phase ZnO powder when calcined at 280 °C for 3 h in air. The solution pH and the precipitation duration strongly affected the surface area of the calcined ZnO powder. Detailed structural characterizations demonstrated that the synthesized ZnO powder were single crystalline with wurtzite hexagonal phase. The powdered samples precipitated by homogeneous precipitation crystallized directly to hydrozincite without any intermediate phase formation.The phase structures, morphologies and properties of the final ZnO powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), dynamic light scattering particle size analysis (DLS), and nitrogen physisorption in order to determine the specific surface area (BET) and the pore size distribution (BJH). |
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