Low temperature pH dependent synthesis of flower-like ZnO nanostructures with enhanced photocatalytic activity |
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Authors: | Mukta V Vaishampayan Imtiaz S Mulla |
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Affiliation: | a Physical and Materials Chemistry Division, National Chemical Laboratory, Homi Bhabha Road, Pune 411008, India b Department of Chemistry, University of Pune, Pune 411007, India |
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Abstract: | In the present study we have synthesized flower-like ZnO nanostructures comprising of nanobelts of 20 nm width by template and surfactant free low-temperature (4 °C) aqueous solution route. The ZnO nanostructures exhibit flower-like morphology, having crystalline hexagonal wurtzite structure with (0 0 1) orientation. The flowers with size between 600 and 700 nm consist of ZnO units having crystallite size of ∼40 nm. Chemical and structural characterization reveals a significant role of precursor:ligand molar ratio, pH, and temperature in the formation of single-step flower-like ZnO at low temperature. Plausible growth mechanism for the formation of flower-like structure has been discussed in detail. Photoluminescence studies confirm formation of ZnO with the defects in crystal structure. The flower-like ZnO nanostructures exhibit enhanced photochemical degradation of methylene blue (MB) with the increased concentration of ligand, indicating attribution of structural features in the photocatalytic properties. |
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Keywords: | A Nanostructures A Semiconductor D Catalytic properties D Defects D Optical properties |
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